Solution Control Card (HYDT-KE)

This card controls many of the general operational aspects of a simulation. Two Execution Modes are recognized: Normal, and Restart. In the Normal mode, initial state conditions are declared through the Initial Conditions Card. In the Restart mode, initial state conditions are assigned via a restart file from a previous execution or declared through the Initial Conditions Card, using the special overwrite option for selected parameters. The Restart mode offers an option to read named restart files by including the keyword 'file' in the Execution Mode Option character string. 

Solute transport is specified by including the keyword Transport in the Execution Mode field.  The solute transport algorithms are controlled through keyword options.

Execution periods refer to a period of simulation time. The simulator allows the user to specify a single or multiple execution periods. For each execution period, the user can control the initial time step, maximum time step, time step acceleration factor, maximum number of Newton-Raphson iterations, and convergence criterion. 

Field variables, which include physical, thermodynamic, and hydrologic properties, are defined in the finite-difference formulation at the grid cell centers. Conversely, flux variables are defined at grid cell surfaces. Computation of flux variables requires knowledge of field variables at cell surfaces. Values of flux variables at cell surfaces are evaluated by averaging the field values for the two grid cells adjoining an interfacial surface. Interfacial averaging schemes may be declared individually for each field variable through the Interfacial Averaging Variables input.

• Options for the execution modes are provided on the Card Options (HYDT-KE) page.

• Formatting instructions for solution control parameters are provided on the Card Syntax (HYDT-KE) page.

• Examples of solution control cards for STOMP-W with and without solutes and geochemistry are provided on the Card Examples (HYDT-KE) page.