Fluid and Matrix Properties
The Fluids and Matrix Properties node adds Equation 3-39 and Equation 3-40 and defines properties including density, dynamic viscosity, relative permeability, and porosity.
(3-39)
(3-40)
Capillary Model
The list defaults to Capillary diffusion or choose Capillary pressure.
For Capillary diffusion, choose Isotropic to define a scalar or Diagonal, Symmetric, or Full to enter a tensor, and then enter values or expressions in the Dc (SI unit: m2/s) field or fields.
For Capillary pressure, select a Pressure model — van Genuchten (the default), Brooks and Corey, or User defined.
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For van Genuchten, enter an Entry capillary pressure pec (SI unit: Pa), the Constitutive relations constant mvG (dimensionless), and Constitutive relations constant IvG (dimensionless).
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For Brooks and Corey, enter an Entry capillary pressure pec (SI unit: Pa) and the Pore size distribution index λp (dimensionless).
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For User defined, enter a Capillary pressure pc (SI unit: Pa).
Fluid 1 Properties
Select the material to use for Fluid 1. Select Domain material (the default value) to use the material defined for the domain. Select another material to use that material’s properties.
Define the properties for Fluid 1:
The default Density ρ1 (SI unit: kg/m3) uses values From material based on the Fluid 1 selection. For User defined enter another value or expression. The default is 0 kg/m3.
Select a Dynamic viscosity μ1 (SI unit: Pa·s). The default uses values From material as defined by the Fluid 1 selection. For User defined enter another value or expression. The default is 0 Pa·s.
Select the Relative permeability κr1 (a dimensionless number between 0 and 1) for fluid 1. The default is 1.
Fluid 2 Properties
The settings to define the properties for Fluid 2 are similar as for Fluid 1.
Matrix Properties
Select the material to use as porous matrix. Select Domain material (the default) from the Porous material list to use the material defined for the porous domain. Select another material to use that material’s properties.
The default Porosity εp (a dimensionless number between 0 and 1) uses the value From material, defined by the Porous material selection. For User defined enter another value or expression The default is 0.
The default Permeability κ (SI unit: m2) uses the value From material, as defined by the Porous material selection. For User defined select Isotropic to define a scalar or Diagonal, Symmetric or Full to enter a tensor and enter other values or expressions in the field or matrix.