STOMP User Guide
Subsurface Transport Over Multiple Phases
STOMP User Guide
Subsurface Transport Over Multiple Phases
STOMP Variables
The STOMP simulator has been designed with the principal variables defined in modules, which are included in nearly all subroutines. This approach reduces the number of arguments that are passed between routines and increases the readability of the code, because variable names remain unchanged between routines. Field variables are defined at node points and are represented with twodimensional arrays.
General information about principal variables:
 Variable names remain unchanged between routines.
 The STOMP simulator has been coded without equivalence statements and no variables are temporarily overwritten to save memory.
 Variable names generally follow the intrinsic protocols for FORTRAN 77, where:
 integer variables begin with letters in the range 'IN'
 real valued variables begin with letters in the ranges 'AH' and 'OZ'
 variables that begin with the letter 'L' generally indicate integer parameters
List of Variables
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Variables  Description 

ACNM  Air Component Name 
ACPP 
Air Component Parameters 
(1,:) Molecular Weight, kg/kmol  
(2,:) Normal Boiling Point, K  
(3,:) Critical Temperature, K  
(4,:) Critical Pressure, Pa  
(5,:) Critical Molar Volume cm^{3}/mole  
(6,:) Critical Compressibility  
(7,:) Pitzer Acentric Factor  
(8,:) Dipole moment  
(9,:) Isobaric Molar Specific Heat Coeff., a0  
(10,:) Isobaric Molar Specific Heat Coeff., a1  
(11,:) Isobaric Molar Specific Heat Coeff., a2  
(12,:) Isobaric Molar Specific Heat Coeff., a3  
(13,:) Isobaric Molar Specific Heat Coeff., a4  
(14,:) PengRobinson Pure Component, a parameter  
(15,:) PengRobinson Pure Component, b parameter  
(16,:) PengRobinson Pure Component, fw parameter  
(17,:) Mole Fraction  
ACTVC  Constant Activity Coefficient for ECKEChem 
AFX  XDirection Node Area, m^{2} 
AFY  YDirection Node Area, m^{2} 
AFZ  ZDirection Node Area, m^{2} 
AFZSP  Areal Node Surface Area for Spill Modeling, m^{2} 
AGLF  Interfacial Area between Free Gas and Aqueous, m^{2} 
AGLT  Interfacial Area between Trapped Gas and Aqueous, m^{2} 
ALAMB  Ternary Interaction Parameter for the Pitzer Activity Model 
ALBEDO  Soil Albedo Function Parameters 
(1,:) Dry Soil Albedo  
(2,:) Wet Soil Albedo  
(3,:) Albedo Attenuation Factor  
(4,:) Albedo @ Solar Zenith = 60°  
(5,:) Briegleb Albedo Model Parameter C  
ALU  Jacobian Coefficient Matrix 
ANLF  Specific AqueousFree NAPL Interfacial Area, 1/m 
ANLT  Specific AqueousTrapped NAPL Interfacial Area, 1/m 
AOPF_FC  Air Orifice Plate Frequency, 1/m 
ARAI_FC  Area of Air Inlet Chimney, m^{2} 
ARAO_FC  Area of Air Outlet Chimney, m^{2} 
ARCAI_FC  Arc of Air Inlet Chimney, rads 
ARCAO_FC  Arc of Air Outlet Chimney, rads 
ARCAP_FC  Arc of Air Inlet Plenum, rads 
ARCFI_FC  Arc of Fuel Inlet Chimney, rads 
ARCFO_FC  Arc of Fuel Outlet Chimney, rads 
ARCFP_FC  Arc of Fuel Inlet Plenum, rads 
ARFI_FC  Area of Fuel Inlet Chimney, m^{2} 
ARFO_FC  Area of Fuel Outlet Chimney, m^{2} 
AROA_FC  Air ChimneytoPlenum Orifice Area, m^{2} 
AROF_FC  Fuel ChimneytoPlenum Orifice Area, m^{2} 
ASGT  Apparent Trapped Gas Saturation 
ASGTL  Apparent Trapped Gas Saturation, Aqueous 
ASGTN  Apparent Trapped Gas Saturation, NAPL 
ASL  Apparent Aqueous Saturation 
ASLMIN  Minimum Apparent Aqueous Saturation 
ASLMIN_VE  Minimum Apparent Aqueous Saturation for Vertical Equilibrium 
ASLMIN_VEQ  Minimum Apparent Aqueous Saturation for Vertical Equilibrium 
ASLSC  Apparent Aqueous Saturation at Reversal Point 
ASNMIN  Minimum Apparent NAPL Saturation 
ASNR  Apparent Residual NAPL Saturation 
ASNT  Apparent Trapped NAPL Saturation 
AST  Apparent TotalLiquid Saturation 
ASTMAX  Maximum Apparent TotalLiquid Saturation 
ASTMIN  Minimum Apparent TotalLiquid Saturation 
ATALAM  Ternary Function for the Pitzer Activity Model 
ATB0  Binary Function for the Pitzer Activity Model 
ATB1  Binary Function for the Pitzer Activity Model 
ATB2  Binary Function for the Pitzer Activity Model 
ATCLAM  Ternary Function for the Pitzer Activity Model 
ATCMX  Binary Function for the Pitzer Activity Model 
ATHLAM  Ternary Function for the Pitzer Activity Model 
ATMC  Atmospheric Condition Measurement Parameters 
(1) Wind Speed Measurement Height, m  
(2) Air Temp./Relative Humidity Measurement Height, m  
(3) Local Longitude, deg  
(4) Local Latitude, deg  
(5) Local Meridian, deg  
ATMOS  Atmospheric Condition Parameters 
(1,:) Time, s  
(2,:) Temperature, C  
(3,:) Pressure, Pa  
(4,:) Relative Humidity, %  
(5,:) Incident Solar Radiation, W/m2  
(6,:) Wind Speed, m/s  
ATMST  Atmospheric Conditions Data Start Time, s 
ATNLAM  Ternary Function for the Pitzer Activity Model 
ATPA  Binary Parameters for the Pitzer Activity Model 
ATPC  Binary Parameters for the Pitzer Activity Model 
ATTA  Binary Parameters for the Pitzer Activity Model 
ATTC  Binary Parameters for the Pitzer Activity Model 
AVPVG  Average Pore Gas Velocity, m/s 
AVPVL  Average Pore Aqueous Velocity, m/s 
B0  Binary interaction parameter for the Pitzer Activity Model 
B1  Binary interaction parameter for the Pitzer Activity Model 
B2  Binary interaction parameter for the Pitzer Activity Model 
B2P_HT  Table of 2 Phase Beta Values 
BC  Boundary Condition Variables 
BC_GM  Geomechanics Boundary Conditions 
BCXYZG  XYZ Gradient Base Pressure, Pa 
BGL  GasAqueous Scaling Factor 
BGN  GasNAPL Scaling Factor 
BHL  NAPLAqueous Scaling 
BIG  Constant, 1E20 
BIJNA  Binary Interaction Parameters 
BIJTD  Binary Interaction Parameters 
BIL  IceAqueous Scaling Factor 
BIPC  Binary Interaction Parameters 
BIPF  Binary Interaction Parameters 
BLU  Solution Vector 
BMMX  Binary interaction function for the Pitzer Activity Model 
BNL  NAPLAqueous Scaling Factor 
BPHI  Binary interaction function for the Pitzer Activity Model 
BPPR  Binary interaction function for the Pitzer Activity Model 
BPR  Binary interaction function for the Pitzer Activity Model 
BTGL  GasAqueous Scaling Factor 
BTGL_VEQ  GasAqueous Scaling Factor for Vertical Equilibrium 
BTGLB  GasAqueous Scaling Factor at Boundary 
C  Solute Concentration, 1/m3 
C_OBDT  FieldObservation Output Units* (64 characters) 
CA_GL  GasAqueous Contact Angle, deg 
CA_GN  GasNAPL Contact Angle, deg 
CA_NL  NAPLAqueous Contact Angle, deg 
CARD  Card Name* (64 characters) 
CB  Boundary Solute Concentration, 1/m3 
CBO  Old Time Step Boundary Solute Concentration, 1/m3 
CCL_CRN  Aqueous CutOff Concentration for Courant Limit Control 
CDLSF_FC  Stack Frame Limiting Current Density, A/cm^{2} 
CFMX  Porescale to MacroScale Factor 
CH_VRSN  User's Guide Version Number 
CHDATE  Date* (10 characters) 
CHDF  Solute Chain Decay Fraction 
CHKN  Characteristic Matrix Length, m 
CHML  Matrix Characteristic Length, m 
CHMSG  Error Message* (132 characters) 
CHREF  Reference Node Variable Abbreviation* (4 characters) 
CHSF  Surface Flux Variable Abbreviation* (4 characters) 
CHTIME  Time* (8 characters) 
CIMTC  Oil Interphase Mass Transfer Coefficients 
CINH  Gas Hydrate Inhibitor Coefficient 
CL_GM  Direction Cosines for Geomechanics 
CLAMB  Ternary Interaction Parameter for the Pitzer Activity Model 
CLKMX  Maximum Clock Time, s 
CLKSEC  Clock Time, s 
CLU  Solution Vector 
CMIN  Minimum Species Concentration, 1/m^{3} 
CMP  Rock/Soil Compressibility Parameters 
(1,:) Matrix Compressibility, 1/Pa  
(2,:) Fracture Compressibility, 1/Pa  
(3,:) Compressibility Reference Pressure, Pa  
CMPNY  Company Name* 
CMTLN  NAPLAqueous Interphase Mass Transfer Coefficients 
CMXX  Binary Parameter for the Pitzer Activity Model 
CNL  Solute Concentration in NAPL, 1/m3 
CNLO  Old Time Step Solute Concentration in NAPL, 1/m3 
CNM_OS  Component Name for Oil Shales 
CO  Old Time Step Solute Concentration, 1/m3 
CPAC  Isobaric Molar Specific Heat Constants 
(1) Constant a  
(2) Constant b  
(3) Constant c  
(4) Constant d  
CPAI_SP  Specific Heat of Air Inlet  Supply Pipe, J/kg K 
CPAO_SP  Specific Heat of Air Outlet  Supply Pipe, J/kg K 
CPFI_SP  Specific Heat of Fuel Inlet  Supply Pipe, J/kg K 
CPFO_SP  Specific Heat of Fuel Outlet  Supply Pipe, J/kg K 
CPIC_FC  Specific Heat of Inner Casing  Fuel Cell, J/kg K 
CPIC_SP  Specific Heat of Inner Casing Wall  Supply Pipe, J/kg K 
CPIN_FC  Specific Heat of Inner Casing Insulation  Fuel Cell, J/kg K 
CPIN_SP  Specific Heat of Inner Casing Insulation  Supply Pipe, J/kg K 
CPLY_RL  Aqueous Relative Permeability Polynomial Coefficients 
CPLY_SL  Aqueous Saturation Polynomial Coefficients 
CPOC  Oil Isobaric Molar Specific Heat Constants 
CPOC_FC  Specific Heat of Outer Casing  Fuel Cell, J/kg K 
CPOC_SP  Specific Heat of Outer Casing  Supply Pipe, J/kg K 
CPS  Rock/Soil Specific Heat, J/kg K 
CPSF_FC  Specific Heat of Spacer Rings and Frame Plates  Fuel Cell, J/kg K 
CPSP_FC  Specific Heat of Separator Rings and Frame Plates  Fuel Cell, J/kg K 
CPUMX  Maximum CPU Time, s 
CPUSEC  CPU Time, s 
CRMSIT  SAC Destination Site Name 
CRNTG  Gas Courant Number 
CRNTL  Aqueous Courant Number 
CRNTMXC  Maximum Courant Number for Oil Transport 
CRNTMXT  Maximum Courant Number for Solute or Species Transport 
CRNTN  NAPL Courant Number 
CTA  Higher Order Mixing Term for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTAPH  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTAPPR  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTAPR  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTC  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTCPH  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTCPPR  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
CTCPR  Higher Order Mixing Terms for Unsymmetrical Electrolyte Mixings in Pitzer Model 
D2B2P_HT  Table of 2 Phase Second Derivative Beta Values 
D2FK2P_HT  Table of 2 Phase Second Derivative KFactor Values 
D2FKLE_HT  Table of Lower Phase Envelope Second Derivative KFactor Values 
D2FKUE_HT  Table of Upper Phase Envelope Second Derivative KFactor Values 
D2PLE_HT  Table of Lower Phase Envelope Second Derivative Pressures 
D2PUE_HT  Table of Upper Phase Envelope Second Derivative Pressures 
D50  Mean Particle Diameter (d50), m 
DBH_FC  Diameter of Borehole  Fuel Cell, m 
DBH_SP  Diameter of Borehole  Supply Pipe, m 
DBLTIM  Mass Balance Times, s 
DFEF  Water Vapor Enhanced Diffusion Function Coefficients 
(1,:) Parameter A  
(2,:) Parameter B  
(3,:) Parameter C  
(4,:) Parameter D  
(5,:) Parameter E  
DFGA  Gas CO_{2} or Air Diffusion Coefficient, m^{2}/s 
DFGAB  Gas CO_{2} or Air Diffusion Coefficient on Boundary, m^{2}/s 
DFGAC  Gas CO_{2} Diffusion Coefficient Constant , m^{2}/s 
DFGC  Gas Component Diffusion Coefficient Constant, m^{2}/s 
DFGCB  Gas Component Diffusion Coefficient on Boundary, m^{2}/s 
DFGN  Gas Nitrogen Diffusion Coefficient, m^{2}/s 
DFGNB  Gas Nitrogen Diffusion Coefficient on Boundary, m^{2}/s 
DFGNC  Gas Nitrogen Diffusion Coefficient, m^{2}/s 
DFGO  Gas Oil Diffusion Coefficient, m^{2}/s 
DFGOB  Gas Oil Diffusion Coefficient on Boundary, m^{2}/s 
DFGOC  Gas Oil Diffusion Coefficient Constant, m^{2}/s 
DFGW  Gas Water Diffusion Coefficient, m^{2}/s 
DFGWB  Gas Water Diffusion Coefficient on Boundary, m^{2}/s 
DFGWC  Gas Water Diffusion Coefficient, m^{2}/s 
DFGWW  Gas Water Well Diffusion Coefficient, m^{2}/s 
DFGWWB  Gas Water Well Diffusion Coefficient on Boundary, m^{2}/s 
DFLA  Aqueous Air Diffusion Coefficient, m^{2}/s 
DFLAB  Aqueous Air Diffusion Coefficient on Boundary, m^{2}/s 
DFLAC  Aqueous Air Diffusion Coefficient Constant, m^{2}/s 
DFLAW  Aqueous Air Well Diffusion Coefficient, m^{2}/s 
DFLAWB  Aqueous Air Well Diffusion Coefficient on Boundary, m^{2}/s 
DFLC  Aqueous Component Diffusion Coefficient, m^{2}/s 
DFLCB  Aqueous Component Diffusion Coefficient on Boundary, m^{2}/s 
DFLN  Aqueous Nitrogen Diffusion Coefficient, m^{2}/s 
DFLNB  Aqueous Nitrogen Diffusion Coefficient on Boundary, m^{2}/s 
DFLNC  Aqueous Nitrogen Diffusion Coefficient Constant, m^{2}/s 
DFLO  Aqueous Oil Diffusion Coefficient, m^{2}/s 
DFLOB  Aqueous Oil Diffusion Coefficient on Boundary, m^{2}/s 
DFLOC  Aqueous Oil Diffusion Coefficient Constant, m^{2}/s 
DFLOW  Aqueous Oil Well Diffusion Coefficient, m^{2}/s 
DFLOWB  Aqueous Oil Well Diffusion Coefficient on Boundary, m^{2}/s 
DFLS  Aqueous Salt Diffusion Coefficient, m^{2}/s 
DFLSB  Aqueous Salt Diffusion Coefficient on Boundary, m^{2}/s 
DFLSC  Aqueous Salt Diffusion Coefficient Constant, m^{2}/s 
DFNA  NAPL Alcohol Diffusion Coefficient, m^{2}/s 
DFNAB  NAPL Alcohol Diffusion Coefficient on Boundary, m^{2}/s 
DFNAC  NAPL Diffusion CO_{2} Coefficient Constant, m^{2}/s 
DFNC  NAPL Component Diffusion Coefficient, m^{2}/s 
DFNCB  NAPL Diffusion Component Coefficient on Boundary, m^{2}/s 
DFNN  NAPL N_{2} Diffusion Coefficient, m^{2}/s 
DFNNB  NAPL N_{2} Diffusion Coefficient on Boundary, m^{2}/s 
DFNNC  NAPL N_{2} Diffusion Coefficient Constant, m^{2}/s 
DFNO  NAPL Oil Diffusion Coefficient, m^{2}/s 
DFNOB  NAPL Oil Diffusion Coefficient on Boundary, m^{2}/s 
DFNOC  NAPL Oil Diffusion Coefficient Constant, m^{2}/s 
DFNW  NAPL Water Diffusion Coefficient, m^{2}/s 
DFNWB  NAPL Water Diffusion Coefficient on Boundary, m^{2}/s 
DFNWC  NAPL Water Diffusion Coefficient Constant, m^{2}/s 
DHR_FC  Reaction Energy Released per Mass of Fuel, J/kg 
DIAI_SP  Inner Diameter of Air Inlet of Supply Pipe, m 
DIAO_SP  Outer Diameter of Air Inlet of Supply Pipe, m 
DIFI_SP  Inner Diameter of Fuel Inlet of Supply Pipe, m 
DIFO_SP  Outer Diameter of Fuel Inlet of Supply Pipe, m 
DIIC_FC  Inner Diameter of Inner Casing of Fuel Cell, m 
DIIC_SP  Inner Diameter of Inner Casing of Supply Pipe, m 
DIIN_SP  Inner Diameter of Inner Casing Insulation of Supply Pipe, m 
DIOC_FC  Inner Diameter of Outer Casing of Fuel Cell, m 
DIOC_SP  Inner Diameter of Outer Casing of Supply Pipe, m 
DISPL  Longitudinal Dispersivity, m 
DISPL_GM  (1,:) XDirection Geomechanical Displacement, m 
(2,:) YDirection Geomechanical Displacement, m  
(3,:) ZDirection Geomechanical Displacement, m  
DISPT  Transverse Dispersivity, m 
DLU  Jacobian Coefficients Matrix for SPLIB 
DNR  Primary Variable Increments 
DNR_CW  Primary Variable Increments for Coupled Well 
DNR_VE  Primary Variable Increments for Vertical Equilibrium 
DNRSP  Primary Variable Increments for Surface Spill 
DNRW  Primary Variable Increments for Well 
DOAI_SP  Outer Diameter of Air Inlet of Supply Pipe, m 
DOAO_SP  Outer Diameter of Air Outlet of Supply Pipe, m 
DOFI_SP  Outer Diameter of Fuel Inlet of Supply Pipe, m 
DOFO_SP  Outer Diameter of Fuel Outlet of Supply Pipe, m 
DOHF_SP  Outer Diameter of Heater Fuel of Supply Pipe, m 
DOIC_FC  Outer Diameter of Inner Casing of Fuel Cell, m 
DOIC_SP  Outer Diameter of Inner Casing of Supply Pipe, m 
DOOC_FC  Outer Diameter of Outer Casing of Fuel Cell, m 
DOOC_SP  Outer Diameter of Outer Casing of Supply Pipe, m 
DP_FC  Pressure Primary Variable Increment of Fuel Cell, Pa 
DP_SP  Pressure Primary Variable Increment of Supply Pipe, Pa 
DPLD  Dissolved Oil Longitudinal Dispersivity, m 
DPLGA  Gas CO_{2} Longitudinal Dispersivity, m 
DPLGS  Salt Longitudinal Dispersivity, m 
DPLLA  Aqueous CO_{2} Longitudinal Dispersivity, m 
DPMA  Alcohol Dipole Moment, Debye 
DPMO  Oil Dipole Moment, Debye 
DPMW  Water Dipole Moment, Debye 
DPTD  Dissolved Oil Transverse Dispersivity, m 
DPTGA  Gas CO_{2} Transverse Dispersivity, m 
DPTLA  Aqueous CO_{2} Transverse Dispersivity, m 
DPTRS  Salt Transverse Dispersivity, m 
DRLTIM  Release Plane Times, s 
DRMEFF  Remediation Efficiency 
DRMTIM  Remediation Time, s 
DT  Time Step, s 
DT_CRN  CourantLimit Time Step, s 
DT_FC  Temperature Primary Variable Increment of Fuel Cell, C 
DT_RST  Temporary Time Step, s 
DT_SP  Temperature Primary Variable Increment of Supply Pipe, C 
DTAF  Time Step Acceleration Factor 
DTCF  Time Step Cut Factor 
DTI  Inverse Time Step, 1/s 
DTI_CRN  CourantLimit Inverse Time Step, 1/s 
DTI_RST  Temporary Inverse Time Step, 1/s 
DTMN  Minimum Time Step, s 
DTMX  Maximum Time Step, s 
DTO  Old Time Step, s 
DTSO  Old Time Step for 2nd Order Time Differencing, s 
DXGF  XDirection Grid Cell Dimension, m 
DXGP  XDirection Internodal Dimension, m 
DXSP  XDirection Grid Cell Dimension, m 
DYGF  YDirection Grid Cell Dimension, m 
DYGP  YDirection Internodal Dimension, m 
DYSP  YDirection Grid Cell Dimension, m 
DZGF  ZDirection Grid Cell Dimension, m 
DZGP  ZDirection Internodal Dimension, m 
DZHC_HT  Mole Fraction Spacing for Hydrate Equilibria Data 
DZPC_HT  Mole Fraction Spacing for Phase Equilibria Data 
ECKE_ER  ECKEChem Error Logical 
ECNM  Exhaust Component Name 
ECPP  Exhaust Component Parameters 
(1,:) Molecular Weight, kg/kmol  
(2,:) Normal Boiling Point, K  
(3,:) Critical Temperature, K  
(4,:) Critical Pressure, Pa  
(5,:) Critical Molar Volume cm^{3}/mole  
(6,:) Critical Compressibility  
(7,:) Pitzer Acentric Factor  
(8,:) Dipole moment  
(9,:) Isobaric Molar Specific Heat Coeff., a0  
(10,:) Isobaric Molar Specific Heat Coeff., a1  
(11,:) Isobaric Molar Specific Heat Coeff., a2  
(12,:) Isobaric Molar Specific Heat Coeff., a3  
(13,:) Isobaric Molar Specific Heat Coeff., a4  
(14,:) PengRobinson Pure Component, a parameter  
(15,:) PengRobinson Pure Component, b parameter  
(16,:) PengRobinson Pure Component, fw parameter  
ELAMB  Ternary Interaction Parameter for the Pitzer Activity Model 
ELC_DCF  Electrolyte Density Function Parameters 
ELC_DUN  Electrolyte Density Function Parameter 
ELC_SCF  Electrolyte Surface Tension without Surfactant, N/m 
ELC_SOL  Electrolyte Name* (64 characters) 
ELC_VCF  Electrolyte Viscosity Function Parameters 
ELC_VUN  Electrolyte Viscosity Function Parameter 
EPSL  Machine Precision, 1014 
EQ_C  Stoichometric Coefficient for the Conservation Equation 
EQ_E  Stoichometric Coefficient for the Equilibrium Equation 
EQ_K  Stoichometric Coefficient for the Kinetic Equation 
ETH  Electrostatic function parameter 
ETHP  Electrostatic function parameter 
ETHP2  Electrostatic function parameter 
FACTV  Fixed Species Activity 
FCNM  Fuel Component Name 
FCPP  Fuel Component Parameters 
(1,:) Molecular Weight, kg/kmol  
(2,:) Normal Boiling Point, K  
(3,:) Critical Temperature, K  
(4,:) Critical Pressure, Pa  
(5,:) Critical Molar Volume cm^{3}/mole  
(6,:) Critical Compressibility  
(7,:) Pitzer Acentric Factor  
(8,:) Dipole moment  
(9,:) Isobaric Molar Specific Heat Coeff., a0  
(10,:) Isobaric Molar Specific Heat Coeff., a1  
(11,:) Isobaric Molar Specific Heat Coeff., a2  
(12,:) Isobaric Molar Specific Heat Coeff., a3  
(13,:) Isobaric Molar Specific Heat Coeff., a4  
(14,:) PengRobinson Pure Component, a parameter  
(15,:) PengRobinson Pure Component, b parameter  
(16,:) PengRobinson Pure Component, fw parameter  
FCS_OS  Fractional Kerogen Source, kg 
FF_CW  Fraction Factor for Couple Well 
(1,:) XDirection  
(2,:) YDirection  
(3,:) ZDirection  
FK  Equilibrium K Factors 
FK2P_HT  Equilibrium K Factor Table for 2 Phase Region 
FKLE_HT  Equilibrium K Factor Table for Lower Phase Envelope 
FKUE_HT  Equilibrium K Factor Table for Upper Phase Envelope 
FLG_EXT  Logical Flag for Creating an ".ext" File for UCODE 
FLG_UNI  Logical Flag for Creating an ".uni" File for UCODE 
FNBL  Balance File Name* (64 characters) 
FNPL  Plot File Name* (64 characters) 
FNRC  Recharge File Name* (64 characters) 
FNRD  Input File Name* (64 characters) 
FNRL  Release File Name* (64 characters) 
FNRS  Restart File Name* (64 characters) 
FNSF  Surface Flux File Name* (64 characters) 
FNSR  Screen Unit Name* (64 characters) 
FNVD  Remediate File Name* (64 characters) 
FNWR  Output File Name* (64 characters) 
FOPF_FC  Fuel Orifice Plate Frequency for Fuel Cell, 1/m 
FSFLA  Fractional Solubility Factor for Aqueous CO_{2} 
FUG_LV  Fugacity on the LiquidVapor Saturation Line, Pa 
FUG_ST  CO_{2} Fugacity Coefficient Table 
FUG_TA  CO_{2} Fugacity Coefficient Table 
FX_CW  CO_{2} Mass Flux for Couple Well, kg/s 
FXA_CW  CO_{2} Mass Flux for Couple Well, kg/s 
FXC_CW  Component Mass Flux for Couple Well, kg/s 
FXE_CW  Energy Flux for Couple Well, W 
FXW_CW  Water Mass Flux for Couple Well, kg/s 
GAMMA  Scaling Factor Parameters 
(1,:) Matrix Permeability  
(2,:) Matrix Porosity  
(3,:) Saturation/Relative Permeability Functions Parameter  
(4,:) Saturation/Relative Permeability Functions Parameter  
(5,:) Saturation/Relative Permeability Functions Parameter  
(6,:) Fracture Permeability  
(7,:) Fracture Porosity  
(8,:) Saturation/Relative Permeability Functions Parameter  
(9,:) Saturation/Relative Permeability Functions Parameter  
(10,:) Saturation/Relative Permeability Functions Parameter  
(11,:) Mualem Anisotropy Parameter  
(12,:) Mualem Anisotropy Parameter  
(13,:) Mualem Anisotropy Parameter  
GC_MMP  Gas Composition for Minimum Miscibility Pressure 
GCNM  Gas Component Name 
GCPP  Gas Component Parameters 
(1,:) Molecular Weight, kg/kmol  
(2,:) Normal Boiling Point, K  
(3,:) Critical Temperature, K  
(5,:) Critical Molar Volume cm^{3}/mole  
(6,:) Critical Compressibility  
(7,:) Pitzer Acentric Factor  
(8,:) Dipole moment  
(9,:) Isobaric Molar Specific Heat Coeff., a0  
(10,:) Isobaric Molar Specific Heat Coeff., a1  
(11,:) Isobaric Molar Specific Heat Coeff., a2  
(12,:) Isobaric Molar Specific Heat Coeff., a3  
(13,:) Isobaric Molar Specific Heat Coeff., a4  
(14,:) PengRobinson Pure Component, a parameter  
(15,:) PengRobinson Pure Component, b parameter  
(16,:) PengRobinson Pure Component, fw parameter  
(23,:) Partial Molar Volume Coefficient, a  
(24,:) Partial Molar Volume Coefficient, b  
(25,:) Partial Molar Volume Coefficient, c  
(26,:) Partial Molar Volume Coefficient, d  
(27,:) Partial Molar Volume Coefficient, e  
GPI  Constant, 3.1415926536 
GRAV  Acceleration of Gravity, m/s2 
GRAVX  XDirection Acceleration of Gravity, m/s2 
GRAVY  YDirection Acceleration of Gravity, m/s2 
GRAVZ  ZDirection Acceleration of Gravity, m/s2 
GRVPX  XDir. Internodal Acceleration of Gravity, m/s2 
GRVPY  YDir. Internodal Acceleration of Gravity, m/s2 
GRVPZ  ZDir. Internodal Acceleration of Gravity, m/s2 
GRVX  XDir. Nodal Acceleration of Gravity, m/s2 
GRVY  YDir. Nodal Acceleration of Gravity, m/s2 
GRVZ  ZDir. Nodal Acceleration of Gravity, m/s2 
GWPP 
Water Component Property Parameters 
(1) Molecular Weight, kg/kmol  
(2) Normal Boiling Point, K  
(3) Critical Temperature, K  
(4) Critical Pressure, Pa  
(5) Critical Molar Volume cm^{3}/mole  
(6) Critical Compressibility  
(7) Pitzer Acentric Factor  
(8) Epsilon over Boltzmann Constant  
(9) Liquid Molar Volume, m^{3}/kmol  
(10) Characteristic Length Parameter, m  
(13) PengRobinson Pure Component, a parameter  
(14) PengRobinson Pure Component, b parameter  
(15) PengRobinson Pure Component, fw parameter  
(16) Triple Point Temperature, K  
(17) Triple Point Pressure, Pa  
(18) Ideal Heat Capacity Coefficient A, J/kmol K  
(19) Ideal Heat Capacity Coefficient B, J/kmol K^{2}  
(20) Ideal Heat Capacity Coefficient C, J/kmol K^{3}  
(21) Ideal Heat Capacity Coefficient D, J/kmol K^{4}  
(23) Peneloux Shift Parameter  
H_ST  CO_{2} Enthalpy Table, J/kg 
H_TA  CO_{2} Enthalpy Table, J/kg 
HAI_FC  Enthalpy of Air Inlet of Fuel Cell, J/kg 
HAI_SP  Enthalpy of Air Inlet of Supply Pipe, J/kg 
HAI_WH  Enthalpy of Air Inlet of Well Head, J/kg 
HAO_FC  Enthalpy of Air Outlet of Fuel Cell, J/kg 
HAO_SP  Enthalpy of Air Outlet of Supply Pipe, J/kg 
HAO_WH  Enthalpy of Air Outlet of Well Head, J/kg 
HAS_FC  Enthalpy of Air on Surface of Fuel Cell, J/kg 
HCAW  Henry’s Constant AirWater, Pa 
HCMWE  Capillary Pressure Head for Water Entry (TripleCurve), m 
HCNM  Hydrate Component Name 
HCOW  Henry’s Constant OilWater, Pa 
HCPP 
Hydrate Component Properties 1CO2, 2CH4, 3N2, 4Water 
(1,:) Molecular Weight, kg/kmol  
(2,:) Normal Boiling Point, K  
(3,:) Critical Temperature, K  
(4,:) Critical Pressure, Pa  
(5,:) Critical Molar Volume, cm^{3}/mole  
(6,:) Critical Compressibility  
(7,:) Pitzer Acentric Factor  
(8,:) Dipole Moment, debyes  
(9,:) Liquid Molar Volume, m^{3}/kmol  
(13,:) PengRobinson Pure Component Parameter a  
(14,:) PengRobinson Pure Component Parameter b  
(15,:) PengRobinson Pure Component Parameter fw  
(16,:) Triple Point Temperature, K  
(17,:) Triple Point Pressure, Pa  
(18,:) Ideal Heat Capacity Coefficient A, J/kmol K  
(19,:) Ideal Heat Capacity Coefficient A, J/kmol K^{2}  
(20,:) Ideal Heat Capacity Coefficient A, J/kmol K^{3}  
(21,:) Ideal Heat Capacity Coefficient A, J/kmol K^{4}  
HDOD  Ovendried Capillary Head, m 
HDSC  Apparent Capillary Head at Reversal Point, m 
HFI_FC  Enthalpy of Fuel Inlet of Fuel Cell, J/kg 
HFI_SP  Enthalpy of Fuel Inlet of Supply Pipe, J/kg 
HFI_WH  Enthalpy of Fuel Inlet of Well Head, J/kg 
HFO_FC  Enthalpy of Fuel Outlet of Fuel Cell, J/kg 
HFO_SP  Enthalpy of Fuel Outlet of Supply Pipe, J/kg 
HFO_WH  Enthalpy of Fuel Outlet of Well Head, J/kg 
HFS_FC  Enthalpy of Fuel on Surface of Fuel Cell, J/kg 
HG  Gas Enthalpy, J/kg 
HGA  Air Enthalpy, J/kg 
HGAB  Air Enthalpy on Boundary, J/kg 
HGB  Gas Enthalpy on Boundary, J/kg 
HGC  Gas Component Enthalpy, J/kg 
HGCB  Gas Component Enthalpy on Boundary, J/kg 
HGD  Dry Gas Enthalpy, J/kg 
HGO  Oil Vapor Enthalpy, J/kg 
HGOB  Boundary Oil Vapor Enthalpy, J/kg 
HGW  Water Vapor Enthalpy, J/kg 
HGWB  Boundary Water Vapor Enthalpy, J/kg 
HH  Hydrate Enthalpy, J/kg 
HH_O  Old Hydrate Enthalpy, J/kg 
HHB  Boundary Hydrate Enthalpy, J/kg 
HI  Ice Enthalpy, J/kg 
HI_O  Old Ice Enthalpy, J/kg 
HIB  Boundary Ice Enthalpy, J/kg 
HK  Kerogen Enthalpy, J/kg 
HKL  Interfacial Mass Transfer Coefficient in Aqueous Phase, m2/s 
HKNF  Interfacial Mass Transfer Coefficient in Free NAPL, m2/s 
HKNT  Interfacial Mass Transfer Coefficient in Trapped NAPL, m2/s 
HL  Aqueous Enthalpy, J/kg 
HL_LV  Liquid Enthalpy on the LiquidVapor Saturation Line, Pa 
HL_O  Old Aqueous Enthalpy, J/kg 
HLA  Aqueous CO_{2} Enthalpy, J/kg 
HLAB  Aqueous CO_{2} Enthalpy on Boundary, J/kg 
HLB  Boundary Aqueous Enthalpy, J/kg 
HLF  Solute HalfLife, s 
HLO  Aqueous CH_{4} Enthalpy, J/kg 
HLOB  Aqueous CH_{4} Enthalpy on Boundary, J/kg 
HLS  Aqueous Salt Enthalpy, J/kg 
HLSB  Aqueous Salt Enthalpy on Boundary, J/kg 
HLSP  Aqueous Spill Height/Head, m 
HLW  Aqueous Water Enthalpy, J/kg 
HLW_P  Enthalpy of Liquid Water on Plant, J/kg 
HLWB  Aqueous Water Enthalpy on Boundary, J/kg 
HN  NAPL Enthalpy, J/kg 
HN_O  Old NAPL Enthalpy, J/kg 
HNB  Boundary NAPL Enthalpy, J/kg 
HNSP  Nonaqueous Spill Height/Head, m 
HOLAMB  Ternary Interaction Parameter for the Pitzer Activity Model 
HSP  Precipitated Salt Enthalpy, J/kg 
HSP_O  Old Precipitated Salt Enthalpy, J/kg 
HV_LV  Vapor Enthalpy on the LiquidVapor Saturation Line, Pa 
I_FC  IIndex for Number of Fuel Cell Interval Nodes 
I_INH  Index for Hydrate Inhibitors 
I_LV  Number of Pressure Entries for Property Tables 
I_OBDT  Index for Field Observation Data 
(1,:) Observation Data Type  
(2,:) Observation Data Variable  
(3,:) Observed Data Statistical Index  
(4,:) Observed Data I Index  
(5,:) Observed Data J Index  
(6,:) Observed Data K Index  
(7,:) Observed Data I Index  
(8,:) Observed Data J Index  
(9,:) Observed Data K Index  
I_SP  IIndex of Node with Supply Pipe Interval 
IACTEX  Index for GainesThomas Convection 
IACTV  Activity Coefficient Option 
IALB  BareSoil Albedo Option 
IALB_P  Plant Albedo Option 
IAQU  Index for Aqueous Phase 
IATM_C  Index for Cyclic Atmospheric Conditions 
IBCC  Index for Cyclic Boundary Conditions 
IBCC_GM  LUGR Subgrid Index for Cyclic Boundary Conditions 
IBCD  Index for Boundary Condition Direction 
IBCD_GM  Index for Boundary Condition Direction for Geomechanics 
IBCIN  Boundary Condition Number Pointer 
IBCIN_GM  Boundary Condition Number Pointer for Geomechanics 
IBCLL  IIndex for XYZ Gradient and Seepage Face Boundaries 
IBCM  Index for Number of Boundary Cond. Times 
IBCM_GM  Index for Number of Boundary Cond. Times for Geomechanics 
IBCN  Index for Adjacent Node to Boundary Cond. 
IBCN_GM  Index for Adjacent Node to Boundary Cond. for Geomechanics 
IBCSP  Number of Boundary Condition Reactive Species 
IBCT  Index for Boundary Condition Type 
IBCT_GM  ndex for Boundary Condition Type for Geomechanics 
IBIG  Constant, 32000 
IBL  Unit Number for Release File 
IC_NCG  Initial Condition Option Index for STOMPWCMSE 
IC_OPT  Initial Condition Option Indices 
IC_SP  Initial Condition Option for Reactive Species 
ICAIR  Initial Condition Index for Aqueous Dissolved CO2 
ICBRN  Index for Salt Concentration Initial Condition 
ICC_CW  Index for Cyclic Time Periods for Coupled Wells 
ICCO2  Index for CO_{2} Initial Conditions 
ICCOMP  Index for Initial Conditions for STOMPCOMP 
ICD  Number of Characters in Card Name String 
ICNO  Index for Reference Node Header Line 
ICNS  Index for Surface Flux Header Line 
ICNV  Index for NewtonRaphson Convergence 
ICODE  Index for Code’s Operational Mode 
ICRNT  Index for Courant Number Computation 
ICS  Index for Coordinate System Type 
ICSN  Number of Characters in Subroutine String 
ICT  Index for Aqueous Solute Concentration Initial Cond. 
ICTN  Index for NAPL Solute Concentration Initial Cond. 
ICUTTS  Index for Cutting the Time Step 
ID  XDirection Index of Node 
ID_CW  Indices for Coupled Wells 
ID_VE  Indices for Vertical Equilibrium 
IDD  Index for Species Data in the file comp.dat 
IDF_ELC  Index for Electrolyte Density Function 
IDFLT  Index Indicating Default Value Specified 
IDFLTD  Index Indicating Default Value Used 
IDISP  Index for Hydraulic Dispersion Calculation 
IDMN  Index for Interfacial Averaging Scheme 
(1) Thermal conductivity  
(2) Aqueous density  
(3) Gas density  
(4) Napl density  
(5) Aqueous viscosity  
(6) Gas viscosity  
(7) Napl viscosity  
(8) Aqueous relative permeability  
(9) Gas relative permeability  
(10) Napl relative permeability  
(11) Intrinsic permeability  
(12) Water vapor diffusion  
(13) Oil vapor diffusion  
(14) Dissolved air diffusion  
(15) Dissolved oil diffusion  
(16) Solute diffusion  
(17) Hydraulic dispersion  
(18) Dissolved salt diffusion  
(19) Effective permeability  
(20) Air gas diffusion  
IDP  Index for DualPorosity Model 
IDSPD  Index for Dissolved Oil Dispersion Calcu. 
IDSPS  Index for Salt Dispersion Calcu. 
IEDL  Index for Empirical Solute Diffusion Coefficient 
IEDLS  Index for Empirical Salt Diffusion Coefficient 
IEL_LK  Index for Exchange Species Link 
IEO  Index for Execution Option 
IEPD  Number of Execution Periods 
IEQ_C  Indices for the Conservation Equation for ECKEChem 
IEQ_E  Indices for the Equilibrium Equation for ECKEChem 
IEQ_K  Indices for the Kinetic Equation for ECKEChem 
IEQ_S  Matrix Pointer for ECKEChem 
IEQA  Index for Air Equation 
IEQALC  Index of Alcohol Equation 
IEQC  Index for Solute Transport Equation 
IEQD  Index for DissolvedOil Equation 
IEQDA  Index for DissolvedCO2 Equation 
IEQDO  Boundary Index for DissolvedOil Equation 
IEQGC  Indices for Gas Component Equations 
IEQHA  Index for Hydrate CO_{2} Equation 
IEQHN  Index for Hydrate N_{2} Equation 
IEQHO  Index for Hydrate CH_{4} Equation 
IEQN  Index for Mobile N_{2} Equation 
IEQO  Index for Oil or Mobile CH_{4} Equation 
IEQR  Index for Molar Density Balance Equation 
IEQS  Index for Salt/Solute Equation 
IEQT  Index for Energy Equation 
IEQW  Index for Water Equation 
IFK  Index for Fixing KFactors 
IFLD  Number of Nodes in the XDirectioni 
IFQO  Frequency of Refer. Node Prints (Output) 
IFQS  Frequency of Refer. Node Prints (Screen) 
IGAMMA  (1) Saturated Hydraulic Conductivity Scaling Function 
(2) Diffusive Porosity Scaling Function  
(3) van Genuchten "alpha" or Brooks/Corey "psi" Scaling Function  
(4) van Genuchten "n" or Brooks/Corey "lambda" Scaling Function  
(5) Residual Saturation Scaling Function  
IGAS  Index for Gas Phase 
IHSF  Index for Surface Flux Header 
IJFLD  Number of Nodes in the XY plane 
ILES  Index for Linear Equation Solver 
ILU  Index for Jacobian Matrix Pivoting 
IM  Jacobian Matrix Pointer Array 
IM_CW  CoupledWell Time Periods 
IM_GM  Index for Jacobian Matrix Pointer for Geomechanics 
IMMB  Index for Species Mobility 
IMP_CW  Number of Time Periods in CoupleWell Period 
IMSG  Index for Error Message 
IMTC  Index for Oil Interface Mass Trans. Corr. 
IMTLN  Index for Interface Mass Transfer Function 
IN_VE  Node Number of Vertical Equilibrium Node String 
INAPL  Index for NAPL Phase Liquid or NAPL 
INBS  Index for Internal Boundary Surfaces 
(1,N) Bottom Surface of Node N  
(2,N) South Surface of Node N  
(3,N) West Surface of Node N  
(4,N) East Surface of Node N  
(5,N) North Surface of Node N  
(6,N) Top Surface of Node N  
INCG  Noncondensible Gas Index 
INHNM  Gas Hydrate Inhibitor Name 
INHYD  Index for No Hydrate Rock/Soil 
INMBLT  Number of Global Balance Check Times 
INMREL  Number of SAC Release Plane Time Change, 
INMREM  KNode Indices Number of SAC Remediation Events 
INPDAT  Input File Creation Date* (132 characters) 
INPTIM  Input File Creation Time* (132 characters) 
INT_FC  Number of Fuel Cell Intervals 
INV_CW  Number of Coupled Well Intervals 
IO_PH  Number of CH4 Mass Fraction Entries in Hydrate Pressure Table 
IO_TH  Number of CH4 Mass Fraction Entries in Hydrate Temperature Table 
IOBDEF  Unit Number for an ".ext" File for UCODE 
IOBDSF  Unit Number for an ".sto" File for UCODE 
IOBDUF  Unit Number for an ".uni" File for UCODE 
IOM  Index for Operational Mode 
IONLY_VE  Index for Only Vertical Equilibrium Strings 
IP_TA  CO2 Property Table Pressure Index 
IPCF  Index for GasAqueous Adsorption Function Option 
IPCGL  Index for Solute SolidAqueous Partition Option 
IPCGN  Index for GasNAPL Partition Model Option 
IPCL  Index for SolidAqueous Partition Model Option 
IPCLN  Index for Solute AqueousNAPL Partition Option 
IPCN  Index for Solute SolidNAPL Partition Option 
IPCR  Index for Tabular Location of Critical Point 
IPCSL  Index for Solute Dependent SolidAqueous Part. 
IPCSLD  Index for DissolvedOil Sol.Aqueous Part. Opt. 
IPCSLS  Index for Salt Sol.Aqueous Part. Opt. 
IPH  Triple Curve Scanning Path Index 
IPH_TW  Outer Casing preheat option 
IPK_OS  Number of Kerogen Pyrolysis Reaction Components 
IPL  Unit Number of the Plot File 
IPLOT  Index for Plot File Variables 
IPLOTGC  Component Index for Plot File Variables 
IPRF  Index for Permeability Reduction Factors 
IPROP_GM  Rock/Soil Properties for Geomechanics 
(1,:) PorosityMean Stress Function Type  
(2,:) Intrinsic PermeabilityPorosity Function Type  
(3,:) Capillary PresssurePermeability/Porosity Function Type  
IPTP  Index for Tabular Location of Triple Point 
IPTPS  Index for Surface Tension Correlation Function 
IPV_OS  Component Index of Maximum Volumetric Mole Fraction 
IRC  Unit Number of Recharge File 
IRC_K  Indices for the Kinetic Reaction for ECKEChem 
IRCKN  Indices for the KineticComponent Reactive Species for ECKEChem 
IRCKT  Kinetic Reaction Type Index for ECKEChem 
IRD  Unit Number of the Input File 
IREF  Index for Reference Node Variables 
IREF_CW  Index for Coupled Well Reference Nodes 
IREFGC  Component Index for Reference Node Variables 
IRGTBL  Start/Stop Indices for Gas Relative Permeability Table 
IRHOO  Index for Oil Density Function 
IRHOS  Index for Salt Density Function 
IRL  Unit Number of Release File 
IRLK  SAC release plane Knode index 
IRLTBL  Start/Stop Indices for Aqueous Relative Permeability Table 
IRLTBLT  Start/Stop Indices for Aqueous Relative Permeability Tensor Table 
IRMSOL  Index for Remediated Solute 
IRNTBL  Start/Stop Indices for NAPL Relative Permeability Table 
IRPG  Index for Gas Relative Permeability Function 
IRPL  Index for Aqueous Relative Permeability Function 
IRPLT  Index for Aqueous Relative Permeability Tensor Function 
IRPN  Index for NAPL Relative Permeability Function 
IRS  Unit Number of the Restart File 
IRSM_P  Index for the Root Stress Model for Plant Species 
IS_CW  Well Interval Screen Option (1 = Screened, 0 = Unscreened) 
IS_TH  Number of Salt Mass Fraction Entries in Hydrate Table 
ISALT  Index for Salt Type 
ISC  Unit Number of the Screen (I.e., Standard Output) 
ISCALE  Index for Scaling Group 
ISCHR  Index for SaturationCapillary Pressure Function 
ISF  Unit Number of the Surface File. 
ISFC  Surface Flux Domain Indices 
(1) Bottom  
(2) South  
(3) West  
(4) East  
(5) North  
(6) Top  
ISFD  Index for the Surface Flux Direction 
ISFDOM  Surface Flux Domain Indices 
ISFF  Index for Surface Flux File 
ISFGC  Index for Surface Flux Group 
ISFGP  Number of Surface Flux Inputs for a Surface Flux File 
ISFSN  Normal Surface Flux Orientation Option (1 = Normal) 
ISFT  Surface Flux Type 
ISG  Index for the Surface Flux Type 
ISGNO  Number of Sign. Digits in the Output File 
ISGNP  Number of Sign. Digits in the Plot File 
ISGNS  Number of Sign. Digits on the Screen 
ISIC  Index for Saturation Initial Condition 
ISKP  Index for Skipping Residual Checking on Rock/Soil Types 
ISLC  Indices for Solution Control 
(1) Index for Solute Transport Advection/Diffusion Scheme  
(2) Index for WaterVapor Gas Diffusion Model  
(3) Index for Tortuosity Model  
(4) Index for AqueousPhase Diffusion Coefficient Model  
(5) Index for Soil Freezing Conditions  
(6) Index for Salt Transport Advection/Diffusion Scheme  
(7) Index for Osmotic Pressure and Surface Tension Effects  
(8) Index for DissolvedOil Transport Advection/Diffusion Scheme  
(9) Index for Fluid Properties  
(10) Index for DissolvedAir Trans. Advection/Diffusion Scheme  
(11) Index for Time Differencing Order  
(12) Index for DiffusiveDispersive DissolvedOil Transport Scheme  
(13) Index for Particle Displacing Bubbles  
(14) Index for SPLIB Summary Output  
(15) Index for LUGR  
(16) Index for Density Dependent Solute Transport  
(17) Index for Courant Number Control  
(18) Index for Restart Files  
(19) Index for Scaling Factors  
(20) Index for Inverse (UCode)  
(21) Index for Operational Mode Restart  
(22) Index for IJK Indexing  
(23) Index for Advective Solute Transport  
(24) Index for Plants (Root Uptake Evapotranspiration)  
(25) Index for Poynting Effect  
(26) Index for Rainfall  
(27) Index for Aqueous Molar Density Gradient  
(28) Index for Gas Molar Density Gradient  
(29) Index for NAPL Molar Density Gradient  
(30) Index for (Non)isothermal Conditions  
(31) Index for Equilibrium/First Order Hydrate Saturation  
(32) Index for (Non)isobrine Conditions  
(40) Index for No Reactive/Eckechem Transport  
(41) Index for Nonlinear Solver Option for ECKEChem Start/Stop  
ISLTBL  Indices for Saturation Function Table 
ISM  Index for Saturation Function Extension 
ISMALL  Constant, 3200 
ISNR  Index for NAPL Residual Saturation Model 
ISP_E  Species Exchange Site for ECKEChem 
ISP_IEDL  Aqueous Species Molecular Diffusion Model for ECKEChem 
ISP_MN  Mineral Species Index for ECKEChem 
ISP_OW  Overwrite Option for ECKEChem 
ISP_S  Reverse Matrix Pointer for ECKEChem 
ISPLK  Flow Component Link Index for ECKEChem 
ISRDM  Source Domain Indices 
ISRM  Index for the Stomatal Resistance Model for Plant Species 
ISRM_P  Index for Source Time 
ISRT  Index for Source Type 
ISUB_LOG  Index for Subroutine Names 
ISVC  Number of Coupled Unknowns 
ISVF  Number of Flux Variable Indices 
ISVT  Index for Solute Transport Solution 
ISWBCF  Index for ShuttleworthWallace Boundary Cond. Failure 
IT_CW  Type Index for Coupled Well 
IT_PH  Number of Temperature Entries in Hydrate Pressure Table 
IT_TA  Index for Temperature Range in the CO2 Property Table 
IT_TH  Number of Temperature Entries in Hydrate Table 
ITERDC  Index for Ternary Phase Diagram, Binodal Curve Type 
ITHK  Index for Thermal Conductivity Model 
ITMP_P  Index of Plant Temperatures 
ITOR  Index for Tortuosity Function 
ITS_CW  Index for Coupled Well State 
IUNK  Exponent on temperature units 
IUNKG  Exponent on mass units 
IUNM  Exponent on length units 
IUNMOL  Exponent on molar units 
IUNS  Exponent on time units 
IV_TA  Index for Saturation Line in the CO2 Property Table 
IVAPO  Index for Oil Saturated Vapor Pressure Function 
IVAPS  Index for Alcohol Saturated Vapor Pressure Function 
IVD  Unit Number for STOMP Remediation Transfers Report 
IVF_ELC  Index for Electrolyte Viscosity Function 
IVF_TW  Index for Thermal Well Increments 
IVISA  Index for Alcohol Viscosity Function 
IVISO  Index for Oil Viscosity Function 
IVISS  Index for Surfactant Viscosity Function 
IVR  Number of NonBlank Characters 
IVRSN  Index for Version Number 
IWCC  Index for Cyclic Well Conditions 
IWF_CW  Index for Coupled Well Increments 
IWL  Index for Well Number from Well Node Number 
IWLDM  Well Domain Indices 
IWM  Number of Well Condition Times 
IWN  Index for Node Number form Well Node Number 
IWN_CW  Index for Nodes in Coupled Wells 
IWP_CW  Index of Well Parameters for Coupled Wells 
IWR  Unit Number of the Output File 
IWSI  Index for Well Source Type 
IWT  Index for Well Type 
IXF  Index for Fixed Nodes 
IXP  Matrix Location of Node 
IXP_GM  Index for Geomechanics Nodes Array 
IXREF  Index for Curvilinear Coordinate Factor 
IXW  Index for Well Node Number from Node Number 
IZ  Index for Rock/Soil Type 
IZ_VE  Index for Vertical Equilibrium String Array 
IZ2  Nodal Index 
IZH_HT  Bounding Concentrations Indices for Hydrate Equilibrium 
IZMC  Petroleum Component with Maximum Concentration 
IZP_HT  Bounding Concentrations Indices for Phase Equilibria 
J_FC  JIndex for Number of Fuel Cell Interval Nodes 
J_SP  JIndex of Node with Supply Pipe Interval 
JBCLL  JIndex for XYZ Gradient and Seepage Face Boundaries 
JD  YDirection Index of Node 
JFLD  Number of Nodes in the YDirection 
JKFLD  Number of Nodes in the YZ Plane 
JLU  Unused Banded Matrix Solver Integer Array 
JM  Jacobian Matrix Pointer 
JM_CW  Location of the Well Equation in the Jacobian 
JPA  Anion Pointer for ECKChem 
JPC  Cation Pointer for ECKChem 
JPN  Neutral Pointer for ECKChem 
K_FC  JIndex for Number of Fuel Cell Interval Nodes 
K_SP  KIndex of Node with Supply Pipe Interval 
KBCLL  KIndex for XYZ Gradient and Seepage Face Boundaries 
KD  ZDirection Index of Node 
KEXIT  KIndex for SAC Release Plane 
KFLD  Number of Nodes in the ZDirection 
KIFLD  Number of Nodes in the ZX Plane 
KLU  Coupled Equations Conjugate Gradient Solver Pointer Array 
KLU_CW  Coupled Well Conjugate Gradient Solver Pointer Array 
KLU_GM  Geomechanics Conjugate Gradient Solver Pointer Array 
KLUC  Transport Equations Conjugate Gradient Solver Pointer Array 
KSPS  Spill Node Field Index 
MADJ  Adjacent Node Index Pointer 
MBCLL  Index for Boundary Condition Direction 
MD_GM  Row of Diagonal Elements for Geomechanics Nodes Array 
MDC  Row of Diagonal Elements for Banded Sol. 
MDIM  Conjugate Gradient Solver Pointer Array 
MDT  Matrix Band Width 
MEPD  Index for Cyclic Execution Periods 
MFLX  Flux Variable Index Pointer 
MK_GM  Number of Geomechanics Equations Unknowns 
MKC  Number of Coupled Equations Unknowns 
MKT  Number of Transport Equations Unknowns 
ML_GM  Lower Half Band Width for Geomechanics Nodes Array 
MLC  Lower Half Band Width 
MLT  Matrix Lower Half Band Width 
MLU  Coupled Equations Pointer for SPLIB Solver 
MLU_GM  Geomechanics Equations Pointer for SPLIB Solver 
MLUC  Transport Equations Pointer for SPLIB Solver 
MNEG  Flux Variable Index Pointer 
MNEGB  Boundary Index Pointer 
MNOD  Flux Variable Index Pointer 
MPOS  Flux Variable Index Pointer 
MPOSB  Boundary Index Pointer 
MU_GM  Upper Half Band Width for Geomechanics Nodes Array 
MUC  Upper Half Band Width 
MUT  Matrix Upper Half Band Width 
MXSTEP  Maximum Number of Time Steps 
N_CRN  Courant Number Indexed on Solute 
N_CW  Coupled Well Node Pointer 
N_DB  Node Number for Error Messages 
N_FC  Fuel Cell Interval Node Pointer 
N_RST  Subtime Step Index 
N_SP  Supply Pipe Interval Node Pointer 
N_VE  Vertical Equilibrium Node Pointer 
NA  Pointer to Node of Maximum Residual 
Number of AnionAnion Terms for ECKEChem  
NAC  Number of Air Components 
NATM_T  Number of Atmospheric Condition Table Entries 
NBC  Number of Boundary Conditions 
NBC_GM  Number of Boundary Conditions for Geomechanics 
NBHG  Hydraulic Gradient Type Boundary Condition 
NCC  Number of CationCation Terms for ECKEChem 
NCHEM  Number of Chemical Reactions 
ND  Node Number of I, J, K Indices 
NDF_OS  Number of Distribution Fractions 
NDIM  Number of Active Dimensions 
NDREF  Reference Node Type 
NEA_OS  Number of Activation Energies for Each Component 
NEC  Number of Exhaust Components 
NEPD  Number of Execution Periods 
NEQC  Number of Conservation Equations for ECKEChem 
NEQE  Number of Equilibrium Equations for ECKEChem 
NEQK  Number of Kinetic Equations for ECKEChem 
NESITE  Number of Exchange Sites for ECKEChem 
NFC  Number of Fuel Components 
NFD_FC  Number of Fuel Cell Nodes 
NFD_SP  Supply Pipe Interval Nodes 
NFLD  Number of Active Field Nodes 
NGC  Number of Gas Components 
NH_FC  Number of Fuel Cell Nodes ** 
NHEP_HT  Number of Hydrate Equilibrium Table Points 
NHF_HT  Number of Hydrate Formers 
NITER  Number of Iterations 
NLU  Pointer for SPLIB Solver 
NLU_GM  Pointer for SPLIB Solver for Geomechanics 
NLUC  Pointer for SPLIB Solver for Solutes 
NN_VE  Number of Vertical Equilibrium Nodes 
NNN  Index for the Boundary Surface in the XDirection ** 
NOBDP  Observed Data Point Number 
NOBDS  Observed Data Sample Pointer 
NOBDT  Number of Observed Data Types 
NOTES  Number of Lines of Simulation Notes 
NP_VE  Initial Phase Condition for Vertical Equilibrium 
NPCF  Number of Petroleum Component Fractions 
NPEP_HT  Number of Phase Envelope Table Points 
NPF  Number of Petroleum Fractions 
NPHAZ  Phase Condition 
NPHAZ_VE  Phase Condition for Vertical Equilibrium 
NPHAZW  Phase Condition for Coupled Well Nodes 
NPK_OS  Number of Kerogen Pyrolysis Reactions 
NPLANT  Number of Plants 
NPLY_RL  Number of Aqu. Relative Permeability Polynomial Pieces 
NPLY_SL  Number of Aqueous Saturation Polynomial Pieces 
NPP_HT  Number of TwoPhase Pressure Points 
NPRTM  Number of Print Times 
NQA  Number of Carbon Atoms in Alcohol 
NQO  Number of Carbon Atoms in Oil 
NRCE  Number of Equilibrium Reactions for ECKEChem 
NRCK  Number of Kinetic Reactions for ECKEChem 
NREF  Number of Reference Nodes 
NRIM  Max. Number of Newton Raphson Iterations 
NRIMX  Max. Number of Newton Raphson Iterations 
NROCK  Number of Rock/Soil Types 
NROCK2  Number of Rock/Soil Types in Zonation File 
NRST  Restart Time Step Number 
NRTSI  Number of Reactive Transport Sequence Iterations 
NS_VE  Number of Vertical Equilibrium Strings 
NSCALE  Number of Scaling Groups 
NSD  Node of Maximum Residual 
NSD_CW  Node of Maximum Residual for Coupled Well Nodes 
NSD_VE  Node of Maximum Residual for Vertical Equilibrium Nodes 
NSF  Number of Surface Flux Domains 
NSFDOM  Surface Flux Domain Index 
NSFGP  Number of Named Surface Flux Files 
NSL_ELC  Number of Electrolyte Solutes 
NSOLSR  Number of Solutes 
NSOLU  Number of Transported Solutes 
NSPC  Number of Conservation Component Reactive Species 
NSPE  Number of Exchanged Species for ECKEChem 
NSPG  Number of Gas Reactive Species 
NSPK  Number of Kinetic Component Reactive Species 
NSPL  Number of Aqueous Reactive Species 
NSPLK  Number of Reactive Species Linked to Flow Components 
NSPN  Number of NAPL Reactive Species 
NSPR  Number of Reactive Species 
NSPS  Number of Solid Reactive Species 
NSR  Number of Sources 
NSTEP  Number of Time Steps 
NSX  XDirection Lower Surface Number of Node 
NSY  YDirection Lower Surface Number of Node 
NSZ  ZDirection Lower Surface Number of Node 
NSZW  ZDirection Lower Surface Number of Coupled Well 
NTBL  Node Number of Table Entries 
NTC  Num. of Successive Time Step Reductions 
NTM_TW  Number of Thermal Well Times 
NTMHS_FC  Fuel Cell Heater Times 
NTMHS_SP  Supply Pipe Heater Times 
NTP_HT  Number of Twophase Temperature Points 
NTSR  Number of Time Steps 
NVPLOT  Number of Plot File Variables 
NVREF  Number of Reference Node Variables 
NWF_CW  Number of Field Nodes with Coupled Wells 
NWLN  Number of Coupled Well Nodes 
NWLS  Number of Coupled Wells 
NWN_CW  Number of Coupled Well Nodes 
NXP  Number of Inactive Nodes 
NXP_GM  Number of Inactive Nodes for Geomechanics 
NZH_HT  Dimension of Hydrate Table 
NZP_HT  Dimension of Phase Envelope Table 
OEC  Osmotic Efficiency Coefficient 
OECB  Boundary Osmotic Efficiency Coefficient 
ONE  Constant, 1 
P_CW  Coupled Well Pressure 
P_LV  CO2 or CH4 LiquidVapor Saturation Pressure, Pa 
P_PH  Pressure Array for CO2 Property Data Table, Pa 
P_TA  Pressure Array of Saturation Line for CO2 Property Data Table, Pa 
P_TH  Pressure Array of Hydrate Equilibrium Temperature File 
P2P_HT  Pressure for TwoPhase Region, Pa 
PAF  Component Pitzer Acentric Factor 
PAFA  Alcohol Pitzer Acentric Factor 
PAFO  Oil Pitzer Acentric Factor 
PAFS  Surfactant Pitzer Acentric Factor 
PAFW  Water Pitzer Acentric Factor 
PAI_FC  Air Inlet Pressure for Fuel Cell, Pa 
PAI_SP  Air Inlet Pressure for Supply Pipe, Pa 
PAI_TW  Air Inlet Pressure for Thermal Well, Pa 
PAI_WH  Air Inlet Pressure for Well Head, Pa 
PAIWH  Absolute Air Inlet Pressure at the Well Head, Pa 
PAO_FC  Air Outlet Pressure for Fuel Cell, Pa 
PAO_SP  Air Outlet Pressure for Supply Pipe, Pa 
PAO_TW  Air Outlet Pressure for Thermal Well, Pa 
PAO_WH  Air Outlet Pressure for Well Head, Pa 
PAOWH  Absolute Air Outlet Pressure at the Well Head, Pa 
PARMS_P  Plant Species Parameters 
(1,LPLANT) Maximum Root Depth, m  
(2,LPLANT) Stomatal Res.: Minimum Stomatal Resistance, s/m  
(3,LPLANT) Stomatal Res.: Light Response Coefficient, W/m2  
(4,LPLANT) Null Root Depth, m  
(5,LPLANT) Solar Albedo: Initial Stage Start  
(6,LPLANT) Solar Albedo: Crop Development Start  
(7,LPLANT) Root Depth Fit Parameter  
(8,LPLANT) Solar Albedo: MidSeason Start  
(9,LPLANT) Solar Albedo: LateSeason Start  
(10,LPLANT) Solar Albedo: LateSeason Stop  
(11,LPLANT) Canopy Height, m  
(16,LPLANT) Maximum Condensate Depth, m  
(12,LPLANT) Root StressPoint 1 (Capillary Head), m  
(13,LPLANT) Root StressPoint 2 (Capillary Head), m  
(14,LPLANT) Root StressPoint 3 (Capillary Head), m  
(15,LPLANT) Root StressPoint 4 (Capillary Head), m  
(12,LPLANT) WiltingPoint Water Content  
(13,LPLANT) Norm. Soil Water Content: Critical Point 1  
(14,LPLANT) Norm. Soil Water Content: Critical Point 2  
(15,LPLANT) Saturated Water Content  
(12,LPLANT) Cap. Head when Root Uptake Reduced 50%, m  
(17,LPLANT) Crop Coeff.: Initial Stage Start  
(18,LPLANT) Crop Coeff.: Initial Stage Start Day, s  
(19,LPLANT) Crop Coeff.: Crop Development Start  
(20,LPLANT) Crop Coeff.: Crop Development Start Day, s  
(21,LPLANT) Crop Coeff.: MidSeason Start  
(22,LPLANT) Crop Coeff.: MidSeason Start Day, s  
(23,LPLANT) Crop Coeff.: LateSeason Start  
(24,LPLANT) Crop Coeff.: LateSeason Start Day, s  
(25,LPLANT) Crop Coeff.: LateSeason Stop  
(26,LPLANT) Crop Coeff.: LateSeason Stop Day, s  
(27,LPLANT) Stomatal Res.: Minimum Temperature, C  
(28,LPLANT) Stomatal Res.: Maximum Temperature, C  
(29,LPLANT) Stomatal Res.: Optimum Temperature, C  
PATM  Atmospheric Pressure, Pa 
PC  Component Critical Pressure, Pa 
PCB_HT  Cricondenbar Pressure, Pa 
PCCVA  Alcohol Pure Comp. Characteristic Volume, L/mol 
PCCVO  Oil Pure Comp. Characteristic Volume, L/mol 
PCGL  GasAqueous Partition Coefficient, m3/m3 
PCGN  GasNAPL Partition Coefficient, m3/m3 
PCLN  AqueousNAPL Partition Coefficient, m3/m3 
PCMP  Bulk Compressibility Reference Pressure, Pa 
PCR_HT  Critical Pressure, Pa 
PCRA  CO2 Critical Pressure, Pa 
PCRO  Oil Critical Pressure, Pa 
PCRS  Surfactant Critical Pressure, Pa 
PCRW  Water Critical Pressure, Pa 
PCSL  SolidAqueous Partition Coefficient, m3/kg 
PCSLD  DissolvedOil SolidAqueous Part. Coefficient, m3/kg 
PCSLS  Salt SolidAqueous Part. Coefficient, m3/kg 
PCSN  SolidNAPL Partition Coefficient, m3/kg 
PCT_HT  Cricondenterm Pressure, Pa 
PDXSP  Distance Between Adjacent Nodes in the Plane of the Spill Surface in the XDirection 
PDYSP  Distance Between Adjacent Nodes in the Plane of the Spill Surface in the YDirection 
PERM  Intrinsic Permeability, m2 
PERMRF  Permeability Reduction Factor 
PERMV  Intrinsic Permeability, m2 
PF_CW  Well Pressure at the Node Centroid, Pa 
PFI_FC  Fuel Inlet Pressure at Fuel Cell Well Node, Pa 
PFI_SP  Fuel Inlet Pressure at Supply Pipe Well Node, Pa 
PFI_TW  Fuel Inlet Pressure at Thermal Well Node, Pa 
PFI_WH  Fuel Inlet Pressure at Well Head, Pa 
PFIWH  Absolute Fuel Inlet Pressure at Well Head, Pa 
PFNM  Petroleum Fraction Name 
PFO_FC  Fuel Outlet Pressure at Fuel Cell Well Node, Pa 
PFO_SP  Fuel Outlet Pressure at Supply Pipe Well Node, Pa 
PFO_TW  Fuel Outlet Pressure at Thermal Well Node, Pa 
PFO_WH  Fuel Outlet Pressure at Well Head, Pa 
PFOWH  Absolute Fuel Outlet Pressure at Well Head, Pa 
PFPP  Petroleum Fraction Properties 
PG  Gas Pressure, Pa 
PG_VE  Gas Pressure for Vertical Equilibrium, Pa 
PGB  Boundary Gas Pressure, Pa 
PGFX_GM  Gas Pressure on East and West Surfaces for Geomechanics 
PGFY_GM  Gas Pressure on North and South Surfaces for Geomechanics 
PGFZ_GM  Gas Pressure on Top and Bottom Surfaces for Geomechanics 
PGT_VE  Gas Pressure at the Top of the Vertical Equilibrium String Node, Pa 
PGW  Well Gas Pressure, Pa 
PGW_CO  Old Water Vapor Partial Press. at Mean Crop Flow Height, m 
PH  Hydrate Pressure, Pa 
PHB  Boundary Hydrate Pressure, Pa 
PHDL  Aqueous Ponding Height, m 
PHDN  NAPL Ponding Height, m 
PHE_HT  Pressure for Hydrate Equilibrium Table, Pa 
PHE2T_HT  Second Derivative of Pressure for Hydrate Equilibrium 
PI  Ice Pressure, Pa 
PIB  Boundary Ice Pressure, Pa 
PK_OS  (1, M4, IROCK) Arrhenius Factor 
(2, M4, IROCK) Kerogen Activation Energy  
(M5+2, M4, IROCK) Oil Shale Component Stoichiometric Coefficient  
PKR_OS  (1, 8, IROCK) Kerogen Source 
(2, 8, IROCK) Kerogen Arrhenius Factor  
(MX+1, 8, IROCK) Kerogen Activation Energy  
(MX+2, 8, IROCK) Kerogen Source Fractional Contribution  
PL  Aqueous Pressure, Pa 
PL_CW  Aqueous Pressure for Coupled Well, Pa 
PL_SO  Old Aqueous Pressure at Ground Surface, Pa 
PL_VE  Aqueous Pressure for Vertical Equilibrium, Pa 
PLANT  Plant Name 
PLB  Boundary Aqueous Pressure, Pa 
PLE_HT  Pressure for Lower Phase Envelope, Pa 
PLFX_GM  Aqueous Pressure on East and West Surfaces for Geomechanics 
PLFY_GM  Aqueous Pressure on North and South Surfaces for Geomechanics 
PLFZ_GM  Aqueous Pressure on Top and Bottom Surfaces for Geomechanics 
PLT_VE  Aqueous pressure at the top of the vertical equilibrium string node, Pa 
PLWB  Well Bottom Pressure, Pa 
PLX_CW  Coupled Well Projections in Local Coordinate System in the XDirection 
PLY_CW  Coupled Well Projections in Local Coordinate System in the YDirection 
PLZ_CW  Coupled Well Projections in Local Coordinate System in the ZDirection 
PMDD  Mean Particle Diameter, m 
PMN  Minimum Gas Pressure, Pa 
PMX  Maximum Gas Pressure, Pa 
PN  NAPL Pressure, Pa 
PNB  Boundary NAPL Pressure, Pa 
PNFX_GM  NAPL Pressure on East and West Surfaces for Geomechanics 
PNFY_GM  NAPL Pressure on North and South Surfaces for Geomechanics 
PNFZ_GM  NAPL Pressure on Top and Bottom Surfaces for Geomechanics 
POR  Porosity 
(1) Total Porosity  
(2) Diffusive Porosity  
(3) Fracture Total Porosity  
(4) Diffusive Porosity  
POR_M  Mineral Volume Fraction for ECKEChem 
PORD  Diffusive Porosity 
PORD_O  Old Diffusive Porosity 
PORDB  Boundary Diffusive Porosity 
PORT  Total Porosity 
PORT_O  Old Total Porosity 
PORTB  Boundary Total Porosity 
PORV  Porosity 
(1) Total Porosity  
(2) Diffusive Porosity  
POSB  Boundary Osmotic Pressure, Pa 
POSM  Osmotice Pressure, Pa 
PPEL  Lower Phase Envelope Pressure, Pa 
PPEU  Upper Phase Envelope Pressure, Pa 
PRAI_FC  Perimeter of Air Inlet Chimney for Fuel Cell, m 
PRAO_FC  Perimeter of Air Outlet Chimney for Fuel Cell, m 
PRFI_FC  Perimeter of Fuel Inlet Chimney for Fuel Cell, m 
PRFO_FC  Perimeter of Fuel Outlet Chimney for Fuel Cell, m 
PROP_GM  Geomechanical Properties 
(1,:) Young's Modulus, Pa  
(2,:) Poisson's Ratio 

(3,:) Biot Coefficient  
(4,:) Volumetric Thermal Expansion Coefficient  
PRTM  Plot File Print Time, s 
PSIA  Ternary Electrolyte Parameter Psia for ECKEChem 
PSIC  Ternary Electrolyte Parameter Psic for ECKEChem 
PSO  Oil Saturated Vapor Pressure, Pa 
PSOB  Boundary Oil Saturated Vapor Pressure, Pa 
PSW  Water Saturated Vapor Pressure, Pa 
PSWB  Water Saturated Vapor Pressure, Pa 
PTPA  CO2 Triple Point Pressure, Pa 
PTPS  Surface Tension Function Parameters 
PUE_HT  Pressure for Upper Phase Envelope, Pa 
PVA  Air Vapor Pressure, Pa or Absolute CO2 Vapor pressure, Pa 
PVAB  Boundary Air Vapor Pressure, Pa or Absolute CO2 Boundary Vapor pressure, Pa 
PVC  Gas Component Vapor Pressure, Pa 
PVCB  Gas Component Boundary Vapor Pressure, Pa 
PVHA  Hydrate CO2 Vapor Pressure, Pa 
PVHAB  Hydrate CO2 Boundary Vapor Pressure, Pa 
PVHN  Hydrate N2 Vapor Pressure, Pa 
PVHNB  Hydrate N2 Boundary Vapor Pressure, Pa 
PVHO  Hydrate CH4 Vapor Pressure, Pa 
PVHOB  Hydrate CH4 Boundary Vapor Pressure, Pa 
PVN  Absolute N2 Vapor Pressure, Pa 
PVNB  Absolute N2 Boundary Vapor Pressure, Pa 
PVO  Oil Vapor Pressure, Pa or Absolute CH4 Vapor pressure, Pa 
PVOB  Boundary Oil Vapor Pressure, Pa or Absolute CH4 Boundary Vapor pressure, Pa 
PVW  Water Vapor Pressure, Pa 
PVW_VE  Water Vapor Pressure for Vertical Equilibrium, Pa 
PVWB  Boundary Water Vapor Pressure, Pa 
PW  Coupled Well Total Pressure, Pa 
PWB  Coupled Well Bottom Pressure, Pa 
PWGW  Coupled Well Gas Pressure, Pa 
PWLW  Coupled Well Aqueous Pressure, Pa 
PWNW  Coupled Well NAPL Pressure, Pa 
QAI_SP  Heat Flux for Air Inlet of Supply Pipe Wall, W/m2 
QAIAO_SP  Heat Transfer Across the Orifice Throat between the Air Inlet and Air Outlet of Supply Pipe, W/m2 
QAIFI_SP  Blackbody Radiative Heat Transfer between the Air Inlet Bulk Fluid and Fuel Inlet Supply Pipe Walls, W/m2 
QAIFO_SP  Blackbody Radiative Heat Transfer between the Air Inlet Bulk Fluid and Fuel Outlet Supply Pipe Walls, W/m2 
QAIIC_SP  Blackbody Radiative Heat Transfer between the Air Inlet Bulk Fluid and Inner Casing Insulation, W/m2 
QAIIN_FC  Convective Heat Transfer between the Air Inlet Bulk Fluid and the Insulation, W/m2 
QAISF_FC  Convective Heat Transfer between the Air Inlet Bulk Fluid and the Stack Frame, W/m2 
QAIW_SP  Heat Transport Along Air Inlet Supply Pipes, W/m2 
QAO_SP  Heat Flux for Air Outlet of Supply Pipe Wall, W/m2 
QAOFI_SP  Blackbody Radiative Heat Transfer between the Air Outlet Bulk Fluid and Fuel Inlet Supply Pipe Walls, W/m2 
QAOFO_SP  Blackbody Radiative Heat Transfer between the Air Outlet Bulk Fluid and Fuel Outlet Supply Pipe Walls, W/m2 
QAOIC_SP  Blackbody Radiative Heat Transfer between the Air Outlet Bulk Fluid and Inner Casing Insulation, W/m2 
QAOIN_FC  Convective Heat Transfer between the Air Outlet Bulk Fluid and the Insulation, W/m2 
QAOSF_FC  Convective Heat Transfer between the Air Outlet Bulk Fluid and the Stack Frame, W/m2 
QAOW_SP  Heat Transport Along Air Outlet Supply Pipes, W/m2 
QASSF_FC  Heat Transfer between Air and Stack Frame, W/m2 
QFI_SP  Heat Flux for Fuel Inlet of Supply Pipe Wall, W/m2 
QFIFO_SP  Blackbody Radiative Heat Transfer between the Fuel Inlet Bulk Fluid and Fuel Outlet Supply Pipe Walls, W/m2 
QFIIC_SP  Blackbody Radiative Heat Transfer between the Fuel Inlet Bulk Fluid and Inner Casing Insulation, W/m2 
QFIIN_FC  Convective Heat Transfer between the Fuel Inlet Bulk Fluid and the Insulation, W/m2 
QFISF_FC  Convective Heat Transfer between the Fuel Inlet Bulk Fluid and the Stack Frame, W/m2 
QFIW_SP  Heat Transport Along Fuel Inlet Supply Pipes, W/m2 
QFO_SP  Heat Flux for Fuel Outlet of Supply Pipe Wall, W/m2 
QFOIC_SP  Blackbody Radiative Heat Transfer between the Fuel Outlet Bulk Fluid and Inner Casing Insulation, W/m2 
QFOIN_FC  Convective Heat Transfer between the Fuel Outlet Bulk Fluid and the Insulation, W/m2 
QFOSF_FC  Convective Heat Transfer between the Fuel Outlet Bulk Fluid and the Stack Frame, W/m2 
QFOW_SP  Heat Transport Along Fuel Outlet Supply Pipes, W/m2 
QFSSF_FC  Heat Transfer between Fuel and Stack Frame, W/m2 
QHG_FC  Fuel Cell Heater Power, W/m 
QHG_SP  Supply Pipe Heater Power, W/m 
QHS_FC  Heat Source Rate per Fuel Cell Node, W 
QHS_SP  Heat Source Rate per Supply Pipe Node, W 
QIC_FC  Heat Transfer between Fuel cell Inner Casing, W/m2 
QIC_SP  Heat Transfer between Supply Pipe Inner Casing, W/m2 
QICOC_FC  Blackbody Radiative Heat Transfer between Fuel Cell Inner Casing and Outer Casing, W/m2 
QICOC_SP  Blackbody Radiative Heat Transfer between Inner Casing and Outer Casing Supply Pipe Walls, W/m2 
QIN_FC  Heat Transport Along Fuel Cell Inner Casing Insulation, W/m2 
QIN_SP  Heat Transport Along Supply Pipe Inner Casing Insulation, W/m2 
QINIC_FC  Conductive Heat Transfer between Fuel Cell Inner Casing Insulation and Inner Casing, W/m2 
QINIC_SP  Conductive Heat Transfer between Supply Pipe Inner Casing Insulation and Inner Casing, W/m2 
QL_W  Coupled Well Aqueous Volumetric Flow Rate, m3/s 
QLW  Well Aqueous Volumetric Flow Rate, m3/s 
QM_CW  Coupled Well Mass Rate, kg/s 
QMAWH  Initial Air Mass Flow Rate, kg/s 
QMFWH  Initial Fuel Mass Flow Rate, kg/s 
QN_W  Coupled Well NAPL Volumetric Flow Rate, m3/s 
QNW  Well NAPL Volumetric Flow Rate, m3/s 
QOC_FC  Heat Transport Along Fuel Cell Outer Casing, W/m2 
QOC_SP  Heat Transport Along l Outer Casing, W/m2 
QOCGM_FC  Conductive Heat Transfer between Fuel Cell Outer Casing and Geologic Media, W/m2 
QOCGM_SP  Conductive Heat Transfer between Supply Pipe Outer Casing and Geologic Media, W/m2 
QOP_FC  Fuel Cell Operating Power, W/m 
QPG_FC  Fuel Cell Power, W/m 
QSF_FC  Heat Transport along Fuel Cell Stack Frame, W/m2 
QSFIN_FC  Blackbody Radiative and Conduction Heat Transfer between Stack Frame and Inner Casing Insulation, W/m2 
QT_W  Coupled Well TotalLiquid Volumetric Flow Rate, m3/s 
QTW  Well TotalLiquid Volumetric Flow Rate, m3/s 
R_OBDS  Observed Data Time and Value 
R_OBDT  Observed Data Location and Weighting Factors 
RC_E  Equilibrium Reaction Constant Parameters 
RC_K  Kinetic Reaction Constant Parameters 
RCA  Air Gas Constant, 287.0 J/kg K 
RCHDF  Chemical Reaction Decay Factor 
RCHDFL  Chemical Reaction Decay Factor in Aqueous 
RCHDFN  Chemical Reaction Decay Factor in NAPL 
RCNME  Equilibrium Reaction Name for ECKEChem 
RCNMK  Kinetic Reaction Name for ECKEChem 
RCO  Oil Gas Constant, J/kg K 
RCS  Surfactant Gas Constant, J/kg K 
RCU  Universal Gas Constant, 8314.34 J/kg K 
RCW  Water Gas Constant, 461.52 J/kg K 
RDG_OS  Reference Grid Depth, m 
RFIM_P  Intercepted Rainfall on Plant, kg/ m2 ground 
RHAI_FC  Fuell Cell Air Inlet Density, kg/m3 
RHAI_SP  Supply Pipe Air Inlet Density, kg/m3 
RHAI_WH  Well Head Air Inlet Density, kg/m3 
RHAIW_SP  Density of Air Inlet Supply Pipe Wall, kg/m3 
RHAO_FC  Fuell Cell Air Outlet Density, kg/m3 
RHAO_SP  Supply Pipe Air Inlet Density, kg/m3 
RHAO_WH  Well Head Air Inlet Density, kg/m3 
RHAOW_SP  Density of Air Outlet Supply Pipe Wall, kg/m3 
RHAS_FC  Fuell Cell Air Side Density, kg/m3 
RHFI_FC  Fuell Cell Fuel Inlet Density, kg/m3 
RHFI_SP  Supply Pipe Fuel Inlet Density, kg/m3 
RHFI_WH  Well Head Fuel Inlet Density, kg/m3 
RHFIW_SP  Density of Fuel Inlet Supply Pipe Wall, kg/m3 
RHFO_FC  Fuell Cell Fuel Outlet Density, kg/m3 
RHFO_SP  Supply Pipe Fuel Outlet Density, kg/m3 
RHFO_WH  Well Head Fuel Outlet Density, kg/m3 
RHFOW_SP  Density of Fuel Outlet Supply Pipe Wall, kg/m3 
RHFS_FC  Fuell Cell Fuel Side Density, kg/m3 
RHIC_FC  Fuell Cell Inner Casing Density, kg/m3 
RHIC_SP  Supply Pipe Inner Casing Density, kg/m3 
RHIN_FC  Fuell Cell Inner Casing Insulation Density, kg/m3 
RHIN_SP  Supply Pipe Inner Casing Insulation Density, kg/m3 
RHLF  FirstOrder Reaction Rate Constant, s 
RHLFL  Aqueous FirstOrder Reaction Rate Constant, s 
RHLFN  NAPL FirstOrder Reaction Rate Constant, s 
RHO_OS  Density of Oil Shale, kg/m3 
RHO_ST  CO2 Property Table Values for Density, kg/m3 
RHO_TA  CO2 Property Table Values for Density, kg/m3 
RHOC_FC  Fuell Cell Outer Casing Density, kg/m3 
RHOC_SP  Supply Pipe Outer Casing Density, kg/m3 
RHOCH  Char Density, kg/m3 
RHOCK  Coke Density, kg/m3 
RHOF_CW  Coupled Production Well Fluid Density, kg/m3 
RHOG  Gas Density, kg/m3 
RHOG_O  Old Gas Density, kg/m3 
RHOG_VE  Vertical Equilibrium Gas Density, kg/m3 
RHOGB  Boundary Gas Density, kg/m3 
RHOGI  Well Gas Density, kg/m3 
RHOGW  Water Vapor Density, kg/m3 
RHOGW_O  Old Well Water Vapor Density, kg/m3 
RHOGWB  Well Boundary Water Vapor Density, kg/m3 
RHOH  Hydrate Density, kg/m3 
RHOH_O  Old Hydrate Density, kg/m3 
RHOHB  Boundary Hydrate Density, kg/m3 
RHOI  Ice Density, kg/m3 
RHOI_O  Old Ice Density, kg/m3 
RHOIB  Boundary Ice Density, kg/m3 
RHOK  Kerogen Density, kg/m3 
RHOKB  Boundary Kerogen Density, kg/m3 
RHOL  Aqueous Density, kg/m3 
RHOL_LV  CO2 or CH4 Saturated Liquid Density, kg/m3 
RHOL_O  Old Aqueous Density, kg/m3 
RHOL_VE  Vertical Equilibrium Aqueous Density, kg/m3 
RHOLB  Boundary Aqueous Density, kg/m3 
RHOLI  Density for Invariant Fluids, kg/m3 
RHOLSP  Surface Node Aqueous Density, kg/m3 
RHOLW  Well Aqueous Density, kg/m3 
RHOLW_O  Old Well Aqueous Density, kg/m3 
RHOLWB  Well Boundary Aqueous Density, kg/m3 
RHOMG  Gas Molar Density, kmol/m3 
RHOMGB  Boundary Gas Molar Density, kmol/m3 
RHOML  Aqueous Molar Density, kmol/m3 
RHOMLB  Boundary Aqueous Molar Density, kmol/m3 
RHOMN  NAPL Molar Density, kmol/m3 
RHOMNB  Boundary NAPL Molar Density, kmol/m3 NAPL 
RHOMV  Volumetric Molar Density, kmol/m^3 
RHOMVC  Volumetric Molar Density of Gas Components, kmol/m^3 
(1,:,:) Oil  
(2,:,:) H2  
(3,:,:) CO  
(4,:,:) CO2  
(5,:,:) CH4  
(6,:,:) Component 2  
(7,:,:) Component 3  
RHON  NAPL Density, kg/m3 
RHON_O  Old NAPL Density, kg/m3 
RHONB  Boundary NAPL Density, kg/m3 
RHONSP  Surface Node NAPL Density, kg/m3 
RHONW  Well NAPL Density, kg/m3 
RHONW_O  Old Well NAPL Density, kg/m3 
RHONWB  Well Boundary NAPL Density, kg/m3 
RHORA  Alcohol Liquid Reference Density, kg/m3 
RHORG  Gas Reference Density, kg/m3 
RHORL  Aqueous Reference Density, kg/m3 
RHORN  NAPL Reference Density, kg/m3 
RHORO  Oil Liquid Reference Density, kg/m3 
RHOS  Rock/Soil Particle Density, kg/m3 
RHOSP  Precipitated Salt Density, kg/m3 
RHOSP_O  Old Precipitated Salt Density, kg/m3 
RHOV_LV  CO2 or CH4 Saturated Vapor Density, kg/m3 
RHSF_FC  Fuel Cell Stack Frame Density, kg/m3 
RHSP_FC  Fuel Cell Separator Rings and Plates Density, kg/m3 
RICH_FC  Inner Radius of Chimney Fin for Fuel Cell, m 
RISP_FC  Inner Radius of Separator Flange for Fuel Cell, m 
RISR_FC  Inner Radius of Spacer Ring for Fuel Cell, m 
RKG  Gas Relative Permeability 
RKG_VE  Gas Relative Permeability for Vertical Equilibrium 
RKGB  Boundary Gas Relative Permeability 
RKL  Aqueous Relative Permeability 
(1,:,:) XDirection  
(2,:,:) YDirection  
(3,:,:) ZDirection  
RKL_VE  Vertical Equilibrium Aqueous Relative Permeability 
RKLB  Boundary Aqueous Relative Permeability 
(1,:,:) XDirection  
(2,:,:) YDirection  
(3,:,:) ZDirection  
RKN  NAPL Relative Permeability 
RKNB  Boundary NAPL Relative Permeability 
RLMSG  Real Number Component of Error Message 
RLOAD_GM  Lithostatic Force, N 
RLXF  Relaxation Factor 
ROAP_FC  Fuel Cell Outer Radius of Air Inlet Plenum, m 
ROCH_FC  Fuel Cell Outer Radius of Chimney, m 
ROCK  Rock/Soil Name* (64 characters) 
ROCK2  Rock/Soil Name in Zonation File 
ROFP_FC  Outer Radius of Fuel Inlet Plenum for Fuel Cell, m 
ROSP_FC  Outer Radius of Separator Flange for Fuel Cell, m 
ROSR_FC  Outer Radius of Spacer Ring for Fuel Cell, m 
RP  Radial Coordinate Radius, m 
RPGC  Gas Relative Permeability Function Coefficients 
RPLC  Aqueous Relative Permeability Function Coefficients 
RPLT  Aqueous Relative Permeability Function Coefficients 
RPNC  NAPL Relative Permeability Function Coefficients 
RS_CW  Coupled Well Mass Balance Residuals 
RS_GM  Geomechanics Mass Balance Residuals 
RS_S  Mineral Specific Area for ECKEChem, m2 
RSD  Maximum Residual of Equation 
RSD_CW  Maximum Residual of Coupled Well Equation 
RSD_VE  Maximum Residual of Vertical Equilibrium Equation 
RSDL  Residual 
RSDL_FC  Fuel Cell Residual 
RSDL_SP  Supply Pipe Residual 
RSDL_VE  Vertical Equilibrium Residual 
RSDM  Maximum Residual of Execution Period 
RSDMX  Maximum Residual 
RWRO  Rain Water Run Off Volumetric Rate, m3/s 
S_ST  CO2 Property Table Values for Saturation 
S_TA  CO2 Property Table Values for Saturation 
S_VE  Vertical Equilibrium Salt Volumetric Concentration, kg/m3 
SATAC  Alcohol Saturated Vapor Pressure Function 
SATOC  Coefficients Oil Saturated Vapor Pressure Function 
SCALNM  Scaling Group Name 
SCH  Char Saturation 
SCHB  Boundary Char Saturation 
SCHR  Soil Moisture Retention Charac. Coefficient 
SCHRV  Soil Moisture Retention Charac. Coefficient 
SCK  Coke Saturation 
SCKB  Boundary Coke Saturation 
SCX_GM  Geomechanical Surface Coordinates, XDirection 
SCY_GM  Geomechanical Surface Coordinates, YDirection 
SCZ_GM  Geomechanical Surface Coordinates, ZDirection 
SDCL  Solute Aqueous Molecular Diffusion Coefficient, m2/s 
SDCLS  Salt/Surf. Aqueous Molecular Diffusion Coefficient, m2/s 
SDPF  Fracture Saturation (Dual Porosity) 
SDPFB  Bound. Fracture Saturation (Dual Porosity) 
SDPM  Matrix Saturation (Dual Porosity) 
SDPMB  Bound. Matrix Saturation (Dual Porosity) 
SF  Surface Flux Rate and Integral 
SFCSF  AqueousGas Surface Tension Coefficients 
SG  Gas Saturation 
SG_O  Old Gas Saturation 
SG_VE  Vertical Equilibrium Gas Saturation 
SGB  Boundary Gas Saturation 
SGT  Trapped Gas Saturation 
SGT_VE  Vertical Equilibrium Trapped Gas Saturation 
SGTL  Aqueous Trapped Gas Saturation 
SGTN  NAPL Trapped Gas Saturation 
SH  Hydrate Saturation 
SH_O  Old Hydrate Saturation 
SHB  Boundary Hydrate Saturation 
SI  Ice Saturation 
SI_O  Old Ice Saturation 
SIB  Boundary Ice Saturation 
SIG_GL  GasAqueous Interfacial Tension, N/m 
SIG_GN  GasNAPL Interfacial Tension, N/m 
SIG_HL  HydrateAqueous Interfacial Tension, N/m 
SIG_IL  IceAqueous Interfacial Tension, N/m 
SIG_NL  NAPLAqueous Interfacial Tension, N/m 
SK  Kerogen Saturation 
SK_CW  Skin Factor for Well Interval 
SKB  Boundary Kerogen Saturation 
SL  Aqueous Saturation 
SL_O  Old Aqueous Saturation 
SL_VE  Vertical Equilibrium Aqueous Saturation 
SLB  Boundary Aqueous Saturation 
SLR_VEQ  Vertical Equilibrium Residual Aqueous Saturation 
SLSC  Aqueous Scanning Path Saturation 
SLW  Well Aqueous Saturation 
SLW_O  Old Well Aqueous Saturation 
SMALL  Constant, 1E20 
SMDEF  Macrodispersivity Enhancement Factor 
SMDG  Solute Gas Molecular Diffusion Coefficient, m2/s 
SMDL  Solute Aqueous Molecular Diffusion Coefficient, m2/s 
SMDLS  Salt Aqueous Molecular Diffusion Coefficient, m2/s 
SMDN  Reactive Species NAPL Molecular Diffusion Coefficient, m2/s 
SN  NAPL Saturation 
SN_O  Old NAPL Saturation 
SNB  Boundary NAPL Saturation 
SNR  Residual NAPL Saturation 
SNT  Entrapped NAPL Saturation 
SNW  Well NAPL Saturation 
SNW_O  Old Well NAPL Saturation 
SOLML  Solute Aqueous Solubility Limit, 1/m3 
SOLUT  Solute Name* (64 characters) 
SP_AREA  Specific Area, 1/m 
SP_C  Reactive Species Volumetric Concentration, mol/m3 
SP_CBO  Old Reactive Species Volumetric Concentration, mol/m3 
SP_CI  Initial Species Concentration, mol/m3 node volume 
SP_CMN  Base Mineral Species Concentration, mol/m3 node volume 
SP_CO  Old Boundary Reactive Species Volumetric Conc., mol/m3 
SP_L  Aqueous Species Parameters 
(1,:) Aqueous Species Charge  
(2,:) Aqueous Species Atomic Diameter, m  
(3,:) Aqueous Species Molecular Weight, kg/kmol  
SP_MDG  Reactive Species Gas Molecular Diffusion Coefficient, m2/s 
SP_MDL  Reactive Species Aqueous Molecular Diffusion Coefficient, m2/s 
SP_MDN  Reactive Species NAPL Molecular Diffusion Coefficient, m2/s 
SP_RATE  Mineral Reaction Rate, mol/s 
SP_S  Solid Species Parameters 
(1,:) Solid Species Mass Density, kg/m3  
(2,:) Solid Species Molecular Weight, kg/kmol  
SP_SDCL  Power Function or van Schaik and Kemper Empirical Aqueous Diffusion Model Parameters for ECKEChem 
(1) a Constant 

(2) b Constant  
(3) c Constant  
SPHMIN  Specified Minimum Height, m 
SPNMC  ConservationComponent Species Name for ECKEChem 
SPNME  Exchanged Species Name 
SPNMG  Gas Species Name for ECKEChem 
SPNMK  Aqueous Species Name for ECKEChem 
SPNML  KineticComponent Species Name for ECKEChem 
SPNMN  NAPL Species Name for ECKEChem 
SPNMS  Solid Species Name for ECKEChem 
SPNORM  Cosine of Angle Defining Normal to the Surface of each Node 
SRC  Source Quantity 
SRCA  Air Mass Source, kg/s 
SRCD  Dissolved Oil Mass Source, kg/s 
SRCGC  Gas Component Mass Source Rate, kg/s 
SRCIA  Air Mass Source Integral, kg 
SRCIC  Solute Source Integral, 1/s 
SRCID  Dissolved Oil Mass Source Integral, kg 
SRCIGC  Gas Component Mass Source Integral, kg 
SRCIO  Oil Mass Source Integral, kg 
SRCIS  Salt Mass Source Integral, kg 
SRCIT  Energy Source Integral, J 
SRCIW  Water Mass Source Integral, kg 
SRCN  NAPL Mass Source Rate, kg/s 
SRCO  Oil Mass Source Rate, kg/s 
SRCO_W  Well Oil Mass Source Rate, kg/s 
SRCOSP  Oil Spill Volumetric Source Rate, m3/s 
SRCP  SVE Well Parameters 
(1) SVE Well Minimum Gas Pressure, Pa  
(2) SVE Well Diameter, m  
SRCS  Salt Mass Source, kg/s 
SRCT  Energy Source, W 
SRCW  Water Mass Source, kg/s 
SRCW_W  Well Water Mass Source, kg/s 
SRCWSP  Oil Spill Water Volumetric Source Rate, m3/s 
SS  Precipitated Salt Saturation 
SS_O  Old Precipitated Salt Saturation 
SSB  Boundary Precipitated Salt Saturation 
STRAIN_GM  Effective Strain 
STRESS_GM  Effective Stress, Pa 
STRESSM_GM  Mean Effective Stress, Pa 
STW  Well Total Liquid Saturation 
STW_O  Old Well Total Liquid Saturation 
SUB_LOG  Log of Subroutine Names 
SUBNM  Subroutine Path* (512 characters) 
SUFA  Surface Tension of Pure Alcohol @ 25 C, N/m 
SUFO  Surface Tension of Pure Oil @ 25 C, N/m 
SUFW  Surface Tension of Pure Water @ 25 C, N/m 
SUGL  GasAqueous Interfacial Tension, N/m 
SUGN  GasNAPL Interfacial Tension, N/m 
SUNL  NAPLAqueous Interfacial Tension, N/m 
SVN_ID  SVN ID Number 
SWBCD  ShuttleworthWallace Boundary Condition Depth, m 
SWSI  Source Well Total Component Mass Injected 
T  Temperature, C 
T_CO  Old Crop Temperature, C 
T_LV  CO2 or CH4 LiquidVapor Saturation Temperature, C 
T_O  Old Temperature, C 
T_PH  Temperature Entries in Hydrate Pressure Table 
T_PO  Old Plant Temperature, C 
T_SO  Old Ground Surface Temperature, C 
T_TA  Temperature Array for CO2 Property Data Table 
T_TH  Temperature Array of Hydrate Equilibrium Temperature File 
T_VE  Vertical Equilibrium Temperature, C 
T2P_HT  Temperature for Twophase Region, K 
TAA  Ternary Electrolyte Thetaa Parameter 
TABS  Table Absolute Temperature, 273.15 K 
TAI_FC  Fuel Cell Air Inlet Temperature, C 
TAI_SP  Supply Pipe Air Inlet Temperature, C 
TAI_TW  Thermal Well Air Inlet Temperature, C 
TAI_WH  Well Head Air Inlet Temperature, C 
TAIW_SP  Supply Pipe Wall Air Inlet Temperature, C 
TAO_FC  Fuel Cell Air Outlet Temperature, C 
TAO_SP  Supply Pipe Air Outlet Temperature, C 
TAO_WH  Well Head Air Outlet Temperature, C 
TAOW_SP  Supply Pipe Wall Air Outlet Temperature, C 
TAS_FC  Fuel Cell Air Side Temperature, C 
TAV_FC  Fuel Cell Average Temperature between Ignition and Peak Power, C 
TB  Boundary Temperature, C 
TBA  Air Normal Boiling Temperature, K 
TBLDDX  Array of Second Derivatives for Spline Interpolation 
TBLDDY  Array of Second Derivatives for Spline Interpolation 
TBLX  Array of Tabulated Values for Spline Interpolation 
TBLY  Array of Tabulated Values for Spline Interpolation 
TBO  Oil Normal Boiling Temperature, K 
TBW  Water Normal Boiling Temperature, K 
TC  Component Critical Temperature, K 
TCB_HT  Cricondenbar Temperature for Hydrates, K 
TCC  Ternary Electrolyte Thetac Parameter 
TCMP  Reference Temperature for Soil Compressibilty, C 
TCPP  Total Component Properties Array 
TCR  Critical Temperature, K 
TCR_HT  Critical Temperature for Hydrates, K 
TCRA  Alcohol or CO2 Critical Temperature, K 
TCRO  Oil Critical Temperature, K 
TCRS  Surfactant Critical Temperature, K 
TCRW  Water Critical Temperature, K 
TCT  Cricondenterm Temperature, K 
TCT_HT  Cricondenterm Temperature for Hydrates, K 
TDISPL_GM  Total Geomechanical Displacement, m 
TDRA  Alcohol Density Reference Temperature, C 
TDRO  Oil Density Reference Temperature, C 
TENTH  Constant, 0.1 
TERDC  Ternary Phase Diagram Constants 
(1) Binodal Curve Constant: Ah  
(2) Binodal Curve Constant: Bh  
(3) Binodal Curve Constant: Eh  
(4) Binodal Curve Constant: Fh  
(5) Intermediate Value  
(6) Intermediate Value  
(7) Intermediate Value  
(8) Solubility Limit of Water in Alcohol Free Liquid Oil  
(9) Solubility Limit of Water in Alcohol Free Liquid Oil  
(10) Solubility Limit of Oil in Alcohol Free Liquid Water  
(11) Solubility Limit of Oil in Alcohol Free Liquid Water  
TFI_FC  Fuel Cell Fuel Inlet Temperature, C 
TFI_SP  Supply Pipe Fuel Inlet Temperature, C 
TFI_TW  Thermal Well Fuel Inlet Temperature, C 
TFI_WH  Well Head Fuel Inlet Temperature, C 
TFIW_SP  Supply Pipe Wall Fuel Inlet Temperature, C 
TFO_FC  Fuel Cell Fuel Outlet Temperature, C 
TFO_SP  Supply Pipe Fuel Outlet Temperature, C 
TFO_WH  Well Head Fuel Outlet Temperature, C 
TFOW_SP  Supply Pipe Wall Fuel Outlet Temperature, C 
TFPA  Alcohol Freezing Point Temperature, C 
TFPO  Oil Freezing Point Temperature, C 
TFS_FC  Fuel Cell Fuel Side Temperature, C 
TFX_GM  Thermal Stress in the XDirection, Pa 
TFY_GM  Thermal Stress in the YDirection, Pa 
TFZ_GM  Thermal Stress in the ZDirection, Pa 
THAS_FC  Fuel Cell Thickness/Height of AirSide Flow Channel, m 
THE_HT  Temperature for Hydrate Equilibrium Table, K 
THE2P_HT  Second Derivative of Temperature for Hydrate Equilibrium 
THFP_FC  Fuel Cell Thickness/Height of Frame Plate, m 
THFS_FC  Fuel Cell Thickness/Height of FuelSide Flow Channel, m 
THIRD  One Third 
THKG  Gas Thermal Conductivity, W/m K 
THKGB  Boundary Gas Thermal Conductivity, W/m K 
THKH  Hydrate Thermal Conductivity, W/m K 
THKHB  Boundary Hydrate Thermal Conductivity, W/m K 
THKI  Ice Thermal Conductivity, W/m K 
THKIB  Boundary Ice Thermal Conductivity, W/m K 
THKL  Aqueous Thermal Conductivity, W/m K 
THKLB  Boundary Aqueous Thermal Conductivity, W/m K NAPL 
THKN  NAPL Thermal Conductivity, W/m K 
THKNB  Boundary NAPL Thermal Conductivity, W/m K 
THKOS  Oil Thermal Conductivity, W/m K 
THKOSB  Boundary Oil Thermal Conductivity, W/m K 
THKRA  Reference Air Thermal Conductivity, W/m K 
THKRW  Reference Water Thermal Conductivity, W/m K 
THKS  Thermal Conductivity Model Parameters, W/m K 
THSO_FC  Fuel Cell Thickness/Height of Separator Overall, m 
THSR_FC  Fuel Cell Thickness/Height of Spacer Ring, m 
THSW_FC  Fuel Cell Thickness/Height of Separator Walls 
TIC_FC  Fuel Cell Inner Casing Temperature, C 
TIC_SP  Supply Pipe Inner Casing Temperature, C 
TIN_FC  Fuel Cell Inner Casing Insulation Temperature, C 
TIN_SP  Supply Pipe Inner Casing Insulation Temperature, C 
TITLE  Simulation Title* (132 characters) 
TKAI_FC  Fuel Cell Thermal Conductivity of Air Inlet, W/m K 
TKAI_SP  Supply Pipe Thermal Conductivity of Air Inlet, W/m K 
TKAIW_SP  Thermal Conductivity of AirInlet Supply Pipe Wall, W/m K 
TKAO_FC  Fuel Cell Thermal Conductivity of Air Outlet, W/m K 
TKAO_SP  Supply Pipe Thermal Conductivity of Air Outlet, W/m K 
TKAOW_SP  Thermal Conductivity of Air Outlet Supply Pipe Wall, W/m K 
TKAS_FC  Fuel Cell Thermal Conductivity of Air Side, W/m K 
TKFI_FC  Fuel Cell Thermal Conductivity of Fuel Inlet, W/m K 
TKFI_SP  Supply Pipe Thermal Conductivity of Fuel Inlet, W/m K 
TKFIW_SP  Thermal Conductivity of Fuel Inlet Supply Pipe Wall, W/m K 
TKFO_FC  Fuel Cell Thermal Conductivity of Fuel Outlet, W/m K 
TKFO_SP  Supply Pipe Thermal Conductivity of Fuel Outlet, W/m K 
TKFOW_SP  Thermal Conductivity of Fuel Outlet Supply Pipe Wall, W/m K 
TKFS_FC  Fuel Cell Thermal Conductivity of Fuel Side, W/m K 
TKIC_FC  Fuel Cell Thermal Conductivity of Inner Casing, W/m K 
TKIC_SP  Supply Pipe Thermal Conductivity of Inner Casing, W/m K 
TKIN_FC  Fuel Cell Thermal Conductivity of InnerCasing Insulation, W/m K 
TKIN_SP  Supply Pipe Thermal Conductivity of InnerCasing Insulation, W/m K 
TKOC_FC  Fuel Cell Thermal Conductivity of Outer Casing Wall, W/m K 
TKOC_SP  Supply Pipe Thermal Conductivity of Outer Casing Wall, W/m K 
TKSF_FC  Fuel Cell Thermal Conductivity of Stack Frame, W/m K 
TKSP_FC  Fuel Cell Thermal Conductivity of Separator Rings and Plates, W/m K 
TLE_HT  Temperature for Lower Phase Envelope, K 
TLOAD_GM  Geomechanical Total Load, N 
TM  Time, s 
TM_CRN  Courant Number Limiting Time Step, s 
TM_RST  Time Step Reset, s 
TM_TW  Thermal Well Time, s 
TMBL  Mass Balance Check Time, s 
TMBP_A  Net CO2 Mass Transferred into the Hydrate, kg/s 
TMBP_N  Net N2 Mass Transferred into the Hydrate, kg/s 
TMBP_O  Net CH4 Mass Transferred into the Hydrate, kg/s 
TMC  Total Component Mass, kg 
TMHA  Hydrate CO2 Mass, kg 
TMHN  Hydrate N2 Mass, kg 
TMHO  Hydrate CH4 Mass, kg 
TMHS_FC  Fuel Cell Heat Source Time, s 
TMHS_SP  Supply Pipe Heat Source Time, s 
TML_CW  Total Mass Injected/Withdrawn Limit for Coupled Well, kg 
TMMX  Maximum Time, s 
TMN  Minimum Temperature, C 
TMOB  Observed Date Output Time, s 
TMPA  Time Step Acceleration Factor 
TMPC  Time Step Cut Factor 
TMPD  Execution Period Initial Time Step, s 
TMPE  Execution Period Stop Time, s 
TMPN  Minimum Time Step, s 
TMPR  Plot/Restart File Print Time, s 
TMPS  Execution Period Start Time, s 
TMPX  Execution Period Maximum Time Step, s 
TMRL  Release Plane Time, s 
TMRM  Remediation Event Time, s 
TMS  Total Salt Mass, kg 
TMSB  Total Salt Mass at the Boundary, kg 
TMX  Maximum Temperature, C 
TOC_FC  Fuel Well Thermal Well Outer Casing Temperature, C 
TOC_SP  Supply Pipe Thermal Well Outer Casing Temperature, C 
TOLN  Log to Ln Conversion Factor 
TOR  Tortuosity Function Constants 
TORG  Gas Tortuosity 
TORGB  Boundary Gas Tortuosity 
TORL  Aqueous Tortuosity 
TORLB  Boundary Aqueous Tortuosity 
TORN  NAPL Tortuosity 
TORNB  Boundary NAPL Tortuosity 
TPV_FC  Fuel Cell Energy Peak, eV 
TRAO_SP  Supply Pipe Air Outlet Temperature Controller Range, C 
TRIN_FC  Fuel Cell Inner Casing Insulation Temperature Control Range, C 
TRPGL  GasAqueous Trapping Number 
TRPNL  NAPLAqueous Trapping Number 
TSF_FC  Stack Frame Temperature, C 
TSPRF  Solute Diffusion Reference Temperature, C 
TTAO_SP  Supply Pipe Air Outlet Target Temperature, C 
TTIN_FC  Fuel Cell Inner Casing Insulation Target Temperature, C 
TTPA  CO2 Triple Point Temperature, K 
TTPO  CO2 Triple Point Temperature, K 
TUE_HT  Temperature for Upper Phase Envelope, K 
TWH  Initial Inlet Temperature at Well Head, C 
TXSP  Slope of Surface between Adjacent Surface Nodes in the XDirection, m 
TYSP  Slope of Surface between Adjacent Surface Nodes in the yDirection, m 
U_ST  CO2 Property Table Values for Internal Energy, J/kg 
U_TA  CO2 Property Table Values for Internal Energy, J/kg 
UAI_FC  XDirection Fuel Cell Internal Energy at the Air Inlet, J 
UAI_SP  XDirection Supply Pipe Internal Energy at the Air Inlet, J 
UAO_FC  XDirection Fuel Cell Internal Energy at the Air Outlet, J 
UAO_SP  XDirection Supply Pipe Internal Energy at the Air Outlet, J 
UAS_FC  XDirection Fuel Cell Internal Energy at the Air Side, J 
UC  XDirection Solute Flux, 1/m2 s 
UCN  XDirection Solute Flux in NAPL, 1/m2 s XDirection 
UDGA  XDirection Air Diffusive Mass Flux or XDirection CO2 Diffusive Mass Flux, kg/m2 s 
UDGC  XDirection Gas Component Diffusive Mass Flux, kg/m2 s 
UDGN  XDirection N2 Diffusive Mass Flux, kg/m2 s 
UDGO  XDirection Gas Diffusive Oil Mass Flux or XDirection CH4 Diffusive Mass Flux, kg/m2 s 
UDGW  XDirection Water Vapor Diffusive Flux, kg/m2 s 
UDGW_W  XDirection Well Radial Water Vapor Diffusive Flux, kg/m2 s 
UDLA  XDirection Dissolved Air Diffusive Flux, kg/m2 s 
UDLA_W  Well Radial Dissolved Air Diffusive Flux, kg/m2 s 
UDLC  XDirection Aqueous Component Diffusive Mass Flux, kg/m2 s 
UDLN  XDirection Aqueous N2 Diffusive Mass Flux, kg/m2 s 
UDLO  XDirection Dissolved Oil Diffusive Flux or XDirection Aqueous CH4 Diffusive Mass Flux, kg/m2 s 
UDLO_W  XDirection Well Radial Dissolved Oil Diffusive Flux, kg/m2 s 
UDLW  XDirection Aqueous Water Diffusive Flux, kg/m2 s 
UDNA  XDirection NAPL Air Diffusive Flux, kg/m2 s 
UDNC  XDirection NAPL Component Diffusive Flux, kg/m2 s 
UDNN  XDirection NAPL N2 Diffusive Mass Flux, kg/m2 s 
UDNO  XDirection NAPL Oil Diffusive Flux or XDirection NAPL CH4 Diffusive Flux, kg/m2 s 
UDNW  XDirection NAPL Water Diffusive Flux, kg/m2 s 
UDS  XDirection Salt Diffusion Flux, kg/m2 s 
UEG  Gas Internal Energy, J/kg 
UEG_O  Old Gas Internal Energy, J/kg 
UEGA  CO2 Gas Internal Energy, J/kg 
UEGAB  Boundary CO2 Gas Internal Energy, J/kg 
UEGB  Boundary Gas Internal Energy, J/kg 
UEL  Aqueous Enthalpy, J/kg 
UEN  NAPL Enthalpy, J/kg 
UFI_FC  XDirection Fuel Cell Fuel Inlet Enthalpy, J/kg 
UFI_SP  XDirection Supply Pipe Fuel Inlet Enthalpy, J/kg 
UFO_FC  XDirection Fuel Cell Fuel Outlet Enthalpy, J/kg 
UFO_SP  XDirection Supply Pipe Fuel Outlet Enthalpy, J/kg 
UFS_FC  XDirection Fuel Cell Fuel Side Enthalpy, J/kg 
UG  XDirection Darcy Gas Flux, m/s 
UG_W  Well XDirection Darcy Gas Flux, m/s 
UGA  XDirection Mass Flux of Air or CO2 in Gas, kg/s 
UGC  XDirection Mass Flux of Component in Gas, kg/s 
UGN  XDirection Mass Flux of N2 in Gas, kg/s 
UGO  XDirection Mass Flux of CH4 in Gas, kg/s 
UGW  XDirection Mass Flux of Water Vapor, kg/s 
UL  XDirection Darcy Aqueous Flux, m/s 
UL_LV  XDirection Liquid Internal Energy on the LiquidVapor Saturation Line, J/kg 
UL_W  Well XDirection Darcy Aqueous Flux, m/s 
ULA  XDirection Mass Flux of Air or CO2 in Aqueous, kg/s 
ULC  XDirection Mass Flux of Aqueous Component, kg/s 
ULN  XDirection Mass Flux of Aqueous N2, kg/s 
ULO  XDirection Mass Flux of CH4 in Aqueous, kg/s 
ULSP  XDirection Aqueous Surface Spill Flux, kg/s 
ULW  XDirection Mass Flux of Aqueous Water, kg/s 
UN  XDirection Darcy NAPL Flux, m/s 
UN_W  Well XDirection Darcy NAPL Flux, m/s 
UNA  XDirection Mass Flux of Air or CO2 in NAPL, kg/s 
UNAR  Units for Radiants 
UNC  XDirection Mass Flux of NAPL Component, kg/s 
UNLN  Output/Reference Node Length Units* (64 characters) 
UNN  XDirection Mass Flux of N2 in NAPL, kg/s 
UNO  XDirection Mass Flux of Oil or CH4 in NAPL, kg/s 
UNPLOT  Plot File Variable Index 
UNREF  Reference Node Variable Index 
UNSF  Surface Flux Rate and Integral Units* (64 characters) 
UNSP  XDirection NAPL Surface Spill Flux, kg/s 
UNTM  Output/Reference Node Time Units* (64 characters) 
UNW  XDirection Mass Flux of NAPL Water, kg/s 
UQ  XDirection Energy Flux, W/m2 
US  XDirection Salt Flux, kg/m2 s 
USER  User Name* (64 characters) 
UV_LV  Vapor Internal Energy on the LiquidVapor Saturation Line, J/kg 
VAI_FC  YDirection Fuel Cell Internal Energy at the Air Inlet, J 
VAI_SP  YDirection Supply Pipe Internal Energy at the Air Inlet, J 
VAI_WH  YDirection Supply Pipe Internal Energy at the Well Head, J 
VAO_FC  YDirection Fuel Cell Internal Energy at the Air Outlet, J 
VAO_SP  YDirection Supply Pipe Internal Energy at the Air Outlet, J 
VAO_WH  YDirection Supply Pipe Internal Energy at the Well Head, J 
VAR_CW  Coupled Well Variables 
VAR_CW(1,:,:) Well Time, s  
VAR_CW(2,:,:) Mass Rate, kg/s  
VAR_CW(3,:,:) Pressure Limit, Pa  
VAR_CW(4,:,:) Temperature, C  
VAR_CW(5,:,:) Aqueous CO2 Relative Saturation or Aqueous CO2 Mass Fraction or Aqueous Saturation or Water Vapor Relative Saturation 

VAR_CW(6:,:) Aqueous Salt Relative Saturation or Aqueous Salt Mass Fraction  
VAR_CW(7,:,:) CO2 NAPL Mole Fraction or Gas Mass Fraction of Gas + Oil  
VAR_CW(8,:,:) CH4 NAPL Mole Fraction  
VAR_CW(8+I,:,:) Petroleum Components I NAPL Mole Fraction  
VARB  Input Variable Name* (64 characters) 
VAS_FC  YDirection Fuel Cell Internal Energy at the Air Side, J 
VC  YDirection Solute Flux, 1/m2 s 
VCN  YDirection Solute Flux in NAPL, 1/m2 s 
VCRA  Air Critical Molar Volume, cm3/mol 
VCRO  Oil Critical Molar Volume, cm3/mol 
VCRS  Surfactant Critical Molar Volume, cm3/mol 
VCRW  Water Critical Molar Volume, cm3/mol 
VDGA  YDirection Air Vapor Diffusive Flux, kg/m2 s 
VDGC  YDirection Gas Component Diffusive Mass Flux, kg/m2 s 
VDGN  YDirection N2 Diffusive Mass Flux, kg/m2 s 
VDGO  YDirection Oil Vapor Diffusive Flux, kg/m2 s 
VDGW  YDirection Water Vapor Diffusive Flux, kg/m2 s 
VDLA  YDirection DissolvedAir Diffusive Flux, kg/m2 s 
VDLC  YDirection Aqueous Component Diffusive Mass Flux, kg/m2 s 
VDLN  YDirection Aqueous N2 Diffusive Mass Flux, kg/m2 s 
VDLO  YDirection DissolvedOil Diffusive Flux, kg/m2 s 
VDLW  YDirection Aqueous Water Diffusive Flux, kg/m2 s 
VDNA  YDirection NAPL Air Diffusive Flux, kg/m2 s 
VDNC  YDirection NAPL Component Diffusive Flux, kg/m2 s 
VDNN  YDirection NAPL N2 Diffusive Mass Flux, kg/m2 s 
VDNO  YDirection NAPL Oil Diffusive Flux or YDirection NAPL CH4 Diffusive Flux, kg/m2 s 
VDNW  YDirection NAPL Water Diffusive Flux, kg/m2 s 
VDS  YDirection Salt Diffusion Flux, kg/m2 s 
VFI_FC  YDirection Fuel Cell Fuel Inlet Enthalpy, J/kg 
VFI_SP  YDirection Supply Pipe Fuel Inlet Enthalpy, J/kg 
VFI_WH  YDirection Well Head Fuel Inlet Enthalpy, J/kg 
VFO_FC  YDirection Fuel Cell Fuel Outlet Enthalpy, J/kg 
VFO_SP  YDirection Supply Pipe Fuel Outlet Enthalpy, J/kg 
VFO_WH  YDirection Well Head Fuel Outlet Enthalpy, J/kg 
VFS_FC  YDirection Fuel Cell Fuel Side Enthalpy, J/kg 
VG  YDirection Gas Darcy Flux, m/s 
VGA  YDirection Mass Flux of Air or CO2 in Gas, kg/s 
VGC  YDirection Mass Flux of Gas Components, kg/s 
VGN  YDirection Mass Flux of N2 in Gas, kg/s 
VGO  YDirection Mass Flux of Oil or CH4 in Gas, kg/s 
VGW  YDirection Mass Flux of Water Vapor, kg/s 
VISCA  Alcohol Viscosity Function Constants 
VISCO  Oil Viscosity Function Constants 
VISCS  Surfactant Viscosity Function Constants 
VISDG  Dry Gas Viscosity, Pa s 
VISG  Gas Viscosity, Pa s 
VISGB  Boundary Gas Viscosity, Pa s 
VISGI  Initial Gas Viscosity, Pa s 
VISGW  Well Gas Viscosity, Pa s 
VISGWB  Well Boundary Gas Viscosity, Pa s 
VISL  Aqueous Viscosity, Pa s 
VISLB  Boundary Aqueous Viscosity, Pa s 
VISLI  Initial Aqueous Viscosity, Pa s 
VISLSP  Aqueous Viscosity of Spill Surface Node, Pa s 
VISLW  Well Aqueous Viscosity, Pa s 
VISLWB  Well Boundary Aqueous Viscosity, Pa s 
VISN  NAPL Viscosity, Pa s 
VISNB  Boundary NAPL Viscosity, Pa s 
VISNI  Initial NAPL Viscosity, Pa s 
VISNSP  NAPL Viscosity of Spill Surface Node, Pa s 
VISNW  Well NAPL Viscosity, Pa s 
VISNWB  Well Boundary NAPL Viscosity, Pa s 
VISRG  Gas Reference Viscosity, Pa s 
VISRL  Aqueous Reference Viscosity, Pa s 
VISRN  NAPL Reference Viscosity, Pa s 
VL  YDirection Water Darcy Flux, m/s 
VLA  YDirection Mass Flux of Air or CO2 in Aqueous, kg/s 
VLC  YDirection Mass Flux of Aqueous Component, kg/s 
VLN  YDirection Mass Flux of N2 in Aqueous, kg/s 
VLO  YDirection Mass Flux of Oil or CH4 in Aqueous, kg/s 
VLSP  YDirection Water Flux for Spill Surface Node, m/s 
VLW  YDirection Mass Flux of Aqueous Water, kg/s 
VMC  Component Critical Molar Volume, cm3/mol 
VN  NAPL Darcy Flux, m/s 
VNA  YDirection Mass Flux of Air or CO2 in NAPL, kg/s 
VNC  YDirection Mass Flux of NAPL Component, kg/s 
VNN  YDirection Mass Flux of N2 in NAPL, kg/s 
VNO  YDirection Mass Flux of Oil or CH4 in NAPL, kg/s 
VNSP  YDirection NAPL Flux for Spill Surface Node, m/s 
VNW  YDirection Mass Flux of Water in NAPL, kg/s 
VOL  Node Volume, m3 
VQ  YDirection Energy Flux, W/m2 
VS  YDirection Salt Flux, kg/m2 s 
VSF_FC  Stack Frame Voltage 
VSLC  (1) Reference Aqueous Pressure, Pa 
(2) ReferencePressure Z Location, m  
(3) Reference Temperature, C  
(4) ReferenceTemperature Z Location, m  
(5) Geothermal Gradient, C/m  
WAI_FC  Fuel Cell Air Inlet Velocity, m/s 
WAI_SP  Supply Pipe Air Inlet Velocity, m/s 
WAIAO_FC  Air Velocity at the Orifice Throat between the Air Inlet and Air Outlet, m/s 
WAO_FC  Fuel Cell Air Outlet Velocity, m/s 
WAO_SP  Supply Pipe Air Outlet Velocity, m/s 
WBR  Well Bore Radius, m 
WBR_CW  Coupled Well Bore Radius, m 
WBRS  Well Bore Radius for Storage, m 
WC  ZDirection Solute Flux, 1/m2 s 
WCN  ZDirection Solute Flux in NAPL, 1/m2 s 
WDGA  ZDirection Air Vapor or CO2 Gas Diffusive Flux, kg/m2 s 
WDGC  ZDirection Gas Component Diffusive Flux, kg/m2 s 
WDGN  ZDirection N2 Gas Diffusive Flux, kg/m2 s 
WDGO  ZDirection Oil Vapor or CH4 Gas Diffusive Flux, kg/m2 s 
WDGW  ZDirection Water Vapor Diffusive Flux, kg/m2 s 
WDGW_W  Well ZDirection Water Vapor Diffusive Flux, kg/m2 s 
WDLA  ZDirection Dissolved Air or Aqueous CO2 Diffusive Flux, kg/m2 s 
WDLA_W  Well ZDirection Dissolved Air Diffusive Flux, kg/m2 s 
WDLC  ZDirection Aqueous Component Diffusive Flux, kg/m2 s 
WDLN  ZDirection Aqueous N2 Diffusive Flux, kg/m2 s 
WDLO  ZDirection Dissolved Oil or Aqueous CH4 Diffusive Flux, kg/m2 s 
WDLO_W  Well ZDirection Dissolved Oil or Aqueous CH4 Diffusive Flux, kg/m2 s 
WDLW  ZDirection Aqueous Water Diffusive Flux, kg/m2 s 
WDNA  ZDirection NAPL Air or CO2 Diffusive Flux, kg/m2 s 
WDNC  ZDirection NAPL Component Diffusive Flux, kg/m2 s 
WDNN  ZDirection NAPL N2 Diffusive Flux, kg/m2 s 
WDNO  ZDirection NAPL Oil or CH4 Diffusive Flux, kg/m2 s 
WDNW  ZDirection NAPL Water Diffusive Flux, kg/m2 s 
WDS  ZDirection Salt Diffusion Flux, kg/m2 s 
WFI_FC  Fuel Cell Fuel Inlet Velocity, m/s 
WFI_SP  Supply Pipe Fuel Inlet Velocity, m/s 
WFIFO_FC  Air Velocity at the Orifice Throat between the Fuel Inlet and Fuel Outlet, m/s 
WFMN  Interfacial Average Weighting Factor 
WFO_FC  Fuel Cell Fuel Outlet Velocity, m/s 
WFO_SP  Supply Pipe Fuel Outlet Velocity, m/s 
WG  ZDirection Gas Darcy Flux, m/s 
WG_W  Well ZDirection Gas Darcy Flux, m/s 
WGA  ZDirection Mass Flux of Air or CO2 in Gas, kg/s 
WGC  ZDirection Mass Flux of Gas Component, kg/s 
WGN  ZDirection Mass Flux of N2 Gas, kg/s 
WGO  ZDirection Mass Flux of Oil or CH4 in Gas, kg/s 
WGW  ZDirection Mass Flux of Water Vapor, kg/s 
WHBTA  Alcohol HBT Accentric Factor 
WHBTO  Oil HBT Accentric Factor 
WHP  Initial Well Head Pressure, Pa 
WIDA  Initial Well Dissolved Air Saturation 
WIDO  Initial Well Dissolved Oil Saturation 
WL  ZDirection Aqueous Darcy Flux, m/s 
WL_W  Well ZDirection Aqueous Darcy Flux, m/s 
WLA  ZDirection Mass Flux of Air or CO2 in Aqueous, kg/s 
WLC  ZDirection Mass Flux of Aqueous Component, kg/s 
WLN  ZDirection Mass Flux of Aqueous N2, kg/s 
WLO  ZDirection Mass Flux of Oil or CH4 in Aqueous, kg/s 
WLVR  Well Head Parameters 
WLW  ZDirection Mass Flux of Aqueous Water, kg/s 
WN  ZDirection NAPL Darcy Flux, m/s 
WN_W  Well ZDirection NAPL Darcy Flux, m/s 
WNA  ZDirection Mass Flux of Air or CO2 in NAPL, kg/s 
WNC  ZDirection Mass Flux of NAPL Component, kg/s 
WNM_CW  Coupled Well Type: Injection (IW) or Production (PW) or Single Pass (SP) or Double Pass (DP) 
WNN  ZDirection Mass Flux of NAPL N2, kg/s 
WNO  ZDirection Mass Flux of Oil or CH4 in NAPL, kg/s 
WNW  ZDirection Mass Flux of NAPL Water, kg/s 
WQ  ZDirection Energy Flux, W/m^2 
WRH  Initial Well Relative Humidity 
WS  ZDirection Salt Flux, kg/m^2 s 
WTM  Component Molecular Weight, kg/kmol 
WTMA  Air or CO2 Molecular Weight, kg/kmol 
WTMCH_OS  Char Molecular Weight, kg/kmol 
WTMCK_OS  Coke Molecular Weight, kg/kmol 
WTMK_OS  Kerogen Molecular Weight, kg/kmol 
WTMN  N2 Molecular Weight, kg/kmol 
WTMO  Oil or CH4 Molecular Weight, kg/kgmol 
WTMS  Surfactant Molecular Weight, kg/kgmol 
WTMW  Water Molecular Weight, kg/kgmol 
WWD  Well Total Liquid Depth, m 
WWDL  Well Aqueous Depth, m 
WWDN  Well NAPL Depth, m 
XD_GM  XDirection Geomechanical Surfaces 
XDP_GM  Expansion due to Pressure on XDirection Geomechanical Surfaces 
XDT_GM  Thermal Expansion in the XDirection on Geomechanical Surfaces 
XE  X Node Dimension, m 
XGA  Air Mass Fraction in Gas 
XGA_O  Old Air Mass Fraction in Gas 
XGAB  Boundary Air Mass Fraction in Gas 
XGAW  Well Air Mass Fraction in Gas 
XGAW_O  Old Well Air Mass Fraction in Gas 
XGAWB  Well Boundary Air Mass Fraction in Gas 
XGC  Gas Component Mass Fraction 
XGCB  Gas Component Mass Fraction at the Boundary 
XGN  Gaseous N2 Mass Fraction 
XGNB  Gaseous N2 Mass Fraction at the Boundary 
XGO  Oil Mass Fraction in Gas 
XGO_O  Old Oil Mass Fraction in Gas 
XGOB  Boundary Oil Mass Fraction in Gas 
XGW  Water Mass Fraction in Gas 
XGW_O  Old Well Oil Mass Fraction in Gas 
XGWB  Boundary Water Mass Fraction in Gas 
XGWW  Well Water Mass Fraction in Gas 
XGWW_O  Old Well Water Mass Fraction in Gas 
XGWWB  Well Boundar Water Mass Fraction in Gas 
XHA  CO2 Mass Fraction in Hydrate 
XHA_O  Old CO2 Mass Fraction in Hydrate 
XHAB  Boundary CO2 Mass Fraction in Hydrate 
XHN  Hydrate N2 Mass Fraction 
XHNB  Hydrate N2 Mass Fraction at the Boundary 
XHO  CH4 Mass Fraction in Hydrate 
XHO_O  Old CH4 Mass Fraction in Hydrate 
XHOB  Boundary CH4 Mass Fraction in Hydrate 
XHW  Water Mass Fraction in Hydrate 
XHW_O  Old Water Mass Fraction in Hydrate 
XHWB  Boundary Water Mass Fraction in Hydrate 
XLA  Dissolved Air Mass Fraction in Aqueous 
XLA_O  Old Dissolved Air Mass Fraction in Aqueous 
XLA_VE  Dissolved CO2 Mass Fraction in Aqueous 
XLAB  Boundary Dissolved Air Mass Fraction in Aqueous Well 
XLAW  Dissolved Air Mass Fraction in Aqueous 
XLAW_O  Well Old Dissolved Air Mass Fraction in Aqueous 
XLAWB  Well Boundary Dissolved Air Mass Fraction in Aqueous 
XLC  Gas Component Mass Fraction in Aqueous 
XLCA_HT  CO2 Large Cage Occupany Number for Hydrate Equilibrium Table 
XLCA_PH  CO2 Large Cage Occupany Number from EquilibriumPressure File 
XLCA_TH  CO2 Large Cage Occupancy Numberfrom EquilibriumTemperature File 
XLCA2T_HT  Second Derivative of CO2 Large Cage Occupany for Hydrates 
XLCB  Boundary Gas Component Mass Fraction in Aqueous 
XLCN_HT  N2 Large Cage Occupany Number for Hydrate Equilibrium Table 
XLCN2T_HT  Second Derivative of N2 Large Cage Occupany for Hydrates 
XLCO_HT  CH4 Large Cage Occupany Number for Hydrate Equilibrium Table 
XLCO_PH  CH4 Large Cage Occupany Number from EquilibriumPressure File 
XLCO_TH  CH4 Large Cage Occupancy Numberfrom EquilibriumTemperature File 
XLCO2T_HT  Second Derivative of CH4 Large Cage Occupany for Hydrates 
XLIMX  Maximum Concentration of Inhibitors, % 
XLN  Aqueous N2 Mass Fraction 
XLNB  Aqueous N2 Mass Fraction at the Boundary 
XLO  Dissolved Oil Mass Fraction in Aqueous 
XLO_O  Oil Dissolved Oil Mass Fraction in Aqueous 
XLOB  Boundary Dissolved Oil Mass Fraction in Aqueous 
XLOW  Well Dissolved Oil Mass Fraction in Aqueous 
XLOW_O  Old Dissolved Oil Mass Fraction in Aqueous 
XLOWB  Well Boundary Dissolved Oil Mass Fraction in Aqueous 
XLS  Dissolved Salt Mass Fraction in Aqueous 
XLS_O  Old Dissolved Salt Mass Fraction in Aqueous 
XLSB  Boundary Dissolved Salt Mass Fraction in Aqueous 
XLW  Water Mass Fraction in Aqueous 
XLW_O  Old Well Dissolved Salt Mass Fraction in Aqueous 
XLWB  Boundary Water Mass Fraction in Aqueous 
XLWW  Well Water Mass Fraction in Aqueous 
XLWW_O  Old Well Water Mass Fraction in Aqueous 
XLWWB  Well Boundary Water Mass Fraction in Aqueous 
XMAI_FC  Fuel Cell Air Inlet Air Component Mole Fraction 
XMAI_SP  Supply Pipe Air Inlet Air Component Mole Fraction 
XMAO_FC  Fuel Cell Air Outlet Air Component Mole Fraction 
XMAO_SP  Supply Pipe Air Outlet Air Component Mole Fraction 
XMEC_TW  Reaction Stoichiometry for Fuel Component or Air Component or Exhaust Component 
XMFI_FC  Fuel Cell Fuel Inlet Fuel Component Mole Fraction 
XMFI_SP  Supply Pipe Fuel Inlet Fuel Component Mole Fraction 
XMFO_FC  Fuel Cell Fuel Outlet Fuel Component Mole Fraction 
XMFO_SP  Supply Pipe Fuel Outlet Fuel Component Mole Fraction 
XMG  Gas Mole Fraction 
XMGA  Air Mole Fraction in Gas 
XMGAB  Boundary Air Mole Fraction in Gas 
XMGC  Gas Component Mole Fraction 
XMGCB  Gas Component Mole Fraction at the Boundary 
XMGN  Gas N2 Mole Fraction 
XMGNB  Gas N2 Mole Fraction at the Boundary 
XMGO  Oil Mole Fraction in Gas 
XMGOB  Boundary Oil Mole Fraction in Gas 
XMGW  Water Mole Fraction in Gas 
XMGWB  Boundary Oil Mole Fraction in Gas 
XMGWW  Well Water Vapor Mole Fraction in Gas 
XMGWWB  Well Boundary Water Vapor Mole Fraction in Gas 
XMLA  Air Mole Fraction in Aqueous 
XMLAB  Boundary Air Mole Fraction in Aqueous 
XMLAW  Well Dissolved Air Mole Fraction in Aqueous 
XMLAWB  Well Boundary Dissolved Air Mole Fraction in Aqueous 
XMLC  Aqueous Component Mole Fraction 
XMLCB  Aqueous Component Mole Fraction at the Boundary 
XMLN  Aqueous N2 Mole Fraction 
XMLNB  Aqueous N2 Mole Fraction at the Boundary 
XMLO  Oil Mole Fraction in Aqueous 
XMLOB  Boundary Oil Mole Fraction in Aqueous 
XMLOW  Well Dissolved Oil Mole Fraction in Aqueous 
XMLOWB  Well Boundary Dissolved Oil Mole Fraction in Aqueous 
XMLS  Salt Mole Fraction in Aqueous 
XMLSB  Bound. Salt Mole Frac. in Aqueous 
XMLW  Water Mole Fraction in Aqueous 
XMLWB  Bound. Water Mole Fraction in Aqueous 
XMNA  Alcohol Mole Fraction in NAPL 
XMNAB  Boundary Alcohol Mole Fraction in NAPL 
XMNC  Nonaqueous Component Mole Fraction 
XMNCB  Nonaqueous Component Mole Fraction at the Boundary 
XMNN  Nonaqueous N2 Mole Fraction 
XMNNB  Nonaqueous N2 Mole Fraction at the Boundary 
XMNO  Oil Mole Fraction in NAPL 
XMNOB  Boundary Oil Mole Fraction in NAPL 
XMNW  Water Mole Fraction in NAPL 
XMNWB  Boundary Water Mole Fraction in NAPL 
XMPCF  Mole Fraction of Petroleum Component Fractions 
XMVC  Volumetric Component Mole Fraction 
XMVCB  Volumetric Component Mole Fraction at the Boundary 
XMVGC  Equilibrium Dry Gas Component Mole Fraction in Gas 
XMVGW  Equilibrium Water Mole Fraction in Gas 
XMVLC  Equilibrium Dry Gas Component Mole Fraction in Aqueous 
XMVLW  Equilibrium Water Mole Fraction in Aqueous 
XNA  Alcohol Mass Fraction in NAPL 
XNA_O  Old Alcohol Mass Fraction in NAPL 
XNAB  Boundary Alcohol Mass Fraction in NAPL 
XNC  NAPL Component Mass Fraction 
XNCB  NAPL Component Mass Fraction at the Boundary 
XNN  NAPL N2 Mass Fraction 
XNNB  NAPL N2 Mass Fraction at the Boundary 
XNO  Oil Mass Fraction in NAPL 
XNO_O  Old Oil Mass Fraction in NAPL 
XNOB  Boundary Oil Mass Fraction in NAPL 
XNW  Water Mass Fraction in NAPL 
XNW_O  Old Water Mass Fraction in NAPL 
XNWB  Boundary Water Mass Fraction in NAPL 
XOC_OS  Oil Shale Organic Carbon Mass Fraction 
XP  XDirection Node Centroid Position, m 
XP_CW  Coupled Well XDirection Node Centroid Position, m 
XPBC  XDirection Bottom Surface Centroid 
XREF  Generalized Curvilinear Coordinate Factor 
XREFU  Generalized Curvilinear Coordinate Factor 
XSCA_HT  CO2 Small Cage Occupany for Hydrate Equilibrium Table 
XSCA_PH  CO2 Small Cage Occupany from EquilibriumPressure File 
XSCA_TH  CO2 Small Cage Occupany from EquilibriumTemperatute File 
XSCA2T_HT  Second Derivative of CO2 Small Cage Occupany for Hydrates 
XSCN_HT  N2 Small Cage Occupany for Hydrate Equilibrium Table 
XSCN2T_HT  Second Derivative of N2 Small Cage Occupany for Hydrates 
XSCO_HT  CH4 Small Cage Occupany for Hydrate Equilibrium Table 
XSCO_PH  Second Derivative of CH4 Small Cage Occupany for Hydrates 
XSCO_TH  CH4 Small Cage Occupany from EquilibriumTemperatute File 
XSCO2T_HT  Second Derivative of CH4 Small Cage Occupany for Hydrates 
XSO  Sorbed Oil Mass Fraction 
XSO_O  Old Sorbed Oil Mass Fraction 
XSOB  Boundary Sorbed Oil Mass Fraction 
XSP  Top Active Node XCoordinate 
XTP_CW  XTransition Points for Well Interval, m 
XVC  Volumetric Component Mass Fraction 
XVCB  Volumetric Component Mass Fraction at the Boundary 
YD_GM  YDirection Geomechanical Surfaces 
YDP_GM  Expansion due to Pressure on YDirection Geomechanical Surfaces 
YDT_GM  Thermal Expansion on YDirection Geomechanical Surfaces 
YE  Y Node Dimension, m 
YG  Fraction of Solute in Gas 
YGB  Boundary Fraction of Solute in Gas 
YL  Fraction of Solute in Aqueous 
YLB  Boundary Fraction of Solute in Aqueous 
YLS  Fraction of Dissolved Salt in Aqueous 
YLS_O  Old Fraction of Dissolved Salt in Aqueous 
YLS_VE  Vertical Equilibrium Fraction of Dissolved Salt in Aqueous 
YLSB  Boundary Fraction of Dissolved Salt in Aqueous 
YMGA  Gaseous CO2 Mole Fraction of Formers 
YMGN  Gaseous N2 Mole Fraction of Formers 
YMGO  Gaseous CH4 Mole Fraction of Formers 
YMGO_PH  Gaseous CH4 Mole Fraction of Formers from EquilibriumPressure File 
YMGO_TH  Gaseous CH4 Mole Fraction of Formers from EquilibriumTemperature File 
YMHGA  Hydrate Gas CO2 Mole Fraction of Formers 
YMHGN  Hydrate Gas N2 Mole Fraction of Formers 
YMHGO  Hydrate Gas CH4 Mole Fraction of Formers 
YMHO_PH  Hydrate Gas CH4 Mole Fraction of Formers from EquilibriumPressure File 
YMHO_TH  Hydrate Gas CH4 Mole Fraction of Formers from EquilibriumTemperature File 
YMLOW  Well Dissolved Oil Mole Fraction in Aqueous 
YN  Fraction of Solute in NAPL 
YNB  Boundary Fraction of Solute in NAPL 
YP  YDirection Node Centroid Position, m 
YP_CW  Coupled Well YProjection Array 
YPBC  YCoordinate of Centroid 
YSP  Top Active Node YCoordinate 
YSPG  Gas Fraction of Component Species NEQ at Node N 
YSPL  Aqueous Fraction of Component Species NEQ at Node N 
YSPN  NAPL Fraction of Component Species NEQ at Node N 
YTP_CW  YTransition Points for Well Inteval, m 
ZAIFI_SP  Center Separation: AirInlet and FuelInlet Supply Pipe, m 
ZAIFO_SP  Center Separation: AirInlet and FuelOutlet Supply Pipe, m 
ZAIHF_SP  Center Separation: AirInlet and HeaterFuel Supply Pipe, m 
ZB_VE  Vertical Equilibrium String GasAqueous Interface Elevation 
ZBMIN_VE  Minimum Vertical Equilibrium String GasAqueous Interface Elevation 
ZBTR_VE  Vertical Equilibrium Dissolved CO2 Transition Depth 
ZCRA  Alcohol Critical Compressibility Factor 
ZCRO  Oil Critical Compressibility Factor 
ZCRS  Surfactant Critical Compressibility Factor 
ZCRW  Water Critical Compressibility Factor 
ZD_GM  ZDirection Geomechanical Surfaces 
ZDP_GM  Expansion due to Pressure on ZDirection Geomechanical Surfaces 
ZDT_GM  Thermal Expansion on ZDirection Geomechanical Surfaces 
ZE  Z Node Dimension, m 
ZERO  Constant, 0. 
ZFIFO_SP  Center Separation: FuelInlet and FuelOutlet Supply Pipe, m 
ZFOHF_SP  Center Separation: FuelOutlet and HeaterFuel Supply Pipe, m 
ZG  Gas Compressibility 
ZGB  Gas Compressibility at the Boundary 
ZHC_HT  Mole Fraction of Hydrate Formers for Hydrate Equilibria 
ZLAB  MicroEmulsion Volume Fraction 
ZMC  Total Petroleum Component Mole Fraction 
ZMCA  Total Nonaqueous CO2 Mole Fraction of Formers 
ZMCB  Total Petroleum Component Mole Fraction at the Boundary 
ZMCN  Total Nonaqueous N2 Mole Fraction of Formers 
ZMCO  Total Nonaqueous CH4 Mole Fraction of Formers 
ZMIH_HT  Mole Fraction of Hydrate Formers for Hydrate Equilibria 
(1) Hydrate Gas CO2 Mole Fraction of Formers  
(2) Hydrate Gas N2 Mole Fraction of Formers  
(3) Hydrate Gas CH4 Mole Fraction of Formers  
ZN  NAPL Compressibility 
ZNB  NAPL Compressibility Boundary 
ZP  Z Node Position 
ZP_CW  Z Node Position for Coupled Wells 
ZPBC  ZDirection Bottom Surface Centroid 
ZPC_HT  Mole Fraction of Hydrate Formers for Phase Equilibria 
ZRA  Component Critical Compressibility Factor 
ZRAA  Alcohol Rackett Compressibility Factor 
ZRAO  Oil Rackett Compressibility Factor 
ZSP  Top Active Node ZCoordinate 
ZTP_CW  ZTransition Points for Well Interval, m 
Field variables are defined at node points and are represented with twodimensional arrays. Examples of field variables include primary unknowns, saturation properties, rock/soil properties, and thermodynamic properties (e.g., temperature, pressure, phase saturation, porosity, density, and viscosity).
The first index of a field variable indicates the time step or increment status. The second index of a field variable indicates the node number. The dimension of the first index depends on the operational mode or equivalently number of coupled flow equations; where the dimension will equal the number of unknowns plus two. Therefore, field variables at each node comprise a number of elements equal to the number of unknowns plus two. Each element for each field variable contains a variant on the field variable. For example, the first element or index contains the value of the field variable at the previous time step. A list of field variable variants is shown in the table below.
Field Variable Indexing Scheme
Index  Description 

1  Previous time step value 
2  Current iteration or time step value 
3  First primary variable incremented 
4  Second primary variable incremented 
5  Third primary variable incremented 
6  Fourth primary variable incremented 
Primary Variable Sequencing Scheme
The primary variable order and corresponding field variable variant indexing depend on the Operational Mode. However, primary variables are always ordered, regardless of the operational mode, according to the following equation sequence: energy, water mass, unique component masses to the operational mode, and salt mass. The primary variable ordering system for each operational mode is listed below. Primary variables are referred to by equation because primary variables for a given equation and operational mode are dependent on the local phase condition. Refer to the STOMP Theory Guide (White and Oostrom, 2000) for a description of primary variables, phase conditions, and variable switching. Consider an example for the STOMPGT (Geothermal) Operational Mode, which solves the energy, water mass and air mass conservation equations. For this operational mode, there would be four field variable variant indices. Using the aqueous saturation for an unsaturated node as the example field variable, the following variant definitions would apply: the first index would refer to the aqueous saturation at the previous time step, the second index would refer to the aqueous saturation at the current iteration or time step value, the third index would refer to the aqueous saturation with the aqueous pressure incremented, and the fourth index would refer to the aqueous saturation with the gas pressure incremented.
STOMPW
Equation 1: Water
STOMPGT
Equation 1: Energy
Equation 2: Water
STOMPCO2
Equation 1: Water
Equation 2: CO_{2}
Equation 3: Salt
STOMPCO2E
Equation 1: Energy
Equation 2: Water
Equation 3: CO_{2}
Equation 4: Salt
STOMPEOR
Equation 1: Energy
Equation 2: Water
Equation 3: CO_{2}
Equation 4: CH_{4}
Equation 5: Petroleum Component (s)
Equation 6: Salt
STOMPEORBO
Equation 1: Water
Equation 2: Gas
Equation 3: Oil
Equation 4: Salt
STOMPHYDTKE
Equation 1: Energy
Equation 2: Water
Equation 3: Mobile CO_{2}
Equation 4: Mobile CH_{4}
Equation 5: Mobile N_{2}
Equation 6: Hydrate CO_{2}
Equation 7: Hydrate CH_{4}
Equation 8: Hydrate N_{2}
Equation 4: Salt
STOMPWO
Equation 1: Water
Equation 2: Oil
STOMPWOA
Equation 1: Water
Equation 2: Air
Equation 3: Oil
Flux variables are defined on node surfaces between node points or on boundary surfaces and are represented with two dimensional arrays. Examples of flux variables include heat fluxes, Darcy phase velocities, and component diffusion/dispersion fluxes. Flux variables are aligned with one of the primary orthogonal coordinate directions. Flux variables names that begin with the character 'U' are aligned with the x or radialdirection coordinate, those which begin with the character 'V' are aligned with the y or azimuthaldirection coordinate, and those which begin with the character 'W' are aligned with the z‑direction coordinate. The first index of a flux variable indicates the increment status and the second index indicates the surface number. Unlike field variables, previous timestep fluxes are not stored. Surface numbers do not correspond directly to node numbers. The number of surfaces in any given coordinate direction equals the number of nodes in that direction plus one.
A list of the flux variable variants is shown in the table below. The primary variable order and corresponding field variable variant index depend on the operational mode. In the table, the upper node refers to the node in the east, north, or top direction (positive x, y, or zdirection) with respect to the surface. Likewise, the lower node refers to the node in the west, south, or bottom direction (negative x, y, or z‑direction) with respect to the surface. Consider an example for the STOMPWA (WaterAir) Operational Mode, which solves the water mass and air mass conservation equations. For this operational mode, there would be five flux variable variant indices. Using the zdirection aqueous Darcy velocity for an unsaturated node as the example field variable, the following variant definitions would apply: the first index would refer to the aqueous Darcy velocity for the current iteration or time step value, the second and third indices would refer to the Darcy velocity with the aqueous pressure in the “top” and “bottom” nodes incremented, respectively; and the fourth and fifth indices would refer to the Darcy velocity with the gas pressure in the “top” and “bottom” nodes incremented, respectively.
Flux Variable Indexing Scheme
Index  Description 

1  Current iteration or time step value 
2  First primary variable in the upper node incremented 
3  First primary variable in the lower node incremented 
4  Second primary variable in the upper node incremented 
5  Second primary variable in the lower node incremented 
6  Third primary variable in the upper node incremented 
7  Third primary variable in the lower node incremented 
8  Fourth primary variable in the upper node incremented 
9  Fourth primary variable in the lower node incremented 