Mechanical Properties Card (HYDT-KE)

This card allows the user to assign values to the particle density, porosity, compressibility, and tortuosity function for each defined rock/soil type. Every rock/soil type defined on the Rock/Soil Zonation Card must be referenced. With the IJK Indexing option, node dependent parameters are entered via external files and node independent parameters are entered directly on the card. Particle Density represents the rock grain density. This value will default to 2650 kg/m³ by using a null entry for both the particle density and its associated unit. Total Porosity refers to total connected and unconnected pore volumes. Diffusive Porosity refers to only the connected pore volume. Compressibility is specified via three different approaches: 1) Specific Storativity, 2) Bulk Compressibility, or 3) Pore Compressibility.  If the Specific Storativity is specified it is converted to bulk compressibility, using the specified Diffusive Porosity and reference values for water density and compressibility.  A default Specific Storativity of 10^-7 Pa^-1 is assumed for null entries.  Bulk and pore compressibilities can be specified with or without a Reference Pressure.  Without a Reference Pressure specification, the initial pressure is used as the Reference Pressure. Tortuosity functions are required for simulations that involve solute transport or diffusion of components through phases (e.g., water vapor diffusing through the gas phase). Tortuosities can be computed either as constants, which require input values, or as functions of the phase saturation and diffusive porosity through the Millington and Quirk function. The key words 'dp,' 'dual porosity,' or 'fractured' in the rock/soil name indicate a dual porosity medium, which triggers the reading of both matrix and fracture properties (e.g., Fracture and Matrix Diffusive Porosity, Fracture and Matrix Specific Storativity).

• Mechanical property models, model options and model parameters are described on the Card Options page.

• Formatting instructions for specifying the mechanical property models and parameters are provided on the Card Syntax page.

• Examples of Mechanical Properties Cards for STOMP-HYDT-KE are provided on the Card Examples page.