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Select Permeability (default) to define the permeability of the porous matrix. The default Permeability κM (SI unit: m2) uses the value From material, as defined by the Porous material. For User defined select Isotropic to define a scalar value or Diagonal or Symmetric to define a tensor value.
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Select Hydraulic conductivity or define a combination of fluid permeability and dynamic viscosity. For Hydraulic conductivity KM (SI unit: m/s) select Isotropic to define a scalar value or Diagonal or Symmetric to define a tensor value. The default is 2.94·10−4 m/s.
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Select Kozeny-Carman to define the permeability from the porosity and mean particle diameter. Enter the mean Particle diameter dp,M (SI unit: m), the default value is 0.5 mm.
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van Genuchten, to specify the retention model using the van Genuchten relationship. Enter the constitutive relation constants α (the default value is 1, and the SI unit is 1/m), n (default value is 2), and l (default value is 0.5). The constitutive parameter m is equal to 1 − 1 / n.
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Brooks and Corey to use the retention model according to the Brooks and Corey relationships.
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User defined to use a different retention model. Enter user defined expressions for the Effective saturation Se,M, the Liquid volume fraction θl,M. The default is εp,M (the porosity variable). Specify the Specific moisture capacity Cm,M (SI unit: 1/m). The default value is 0 (1/m). Enter an expression for the Relative permeability κr,M. The default value is 1.
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Retention and Permeability Relationships in the Subsurface Flow Module User’s Guide
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