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When Capillary model is set to Kelvin’s law (default), a Darcy’s law based on the capillary pressure is used, and the capillary pressure itself is derived from the relative humidity by using Kelvin’s law, using the assumption that the liquid and gas phases are in equilibrium in the porous medium.
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When Capillary model is set to Diffusion model, the capillary flux is derived from the gradient of the moisture content and the Moisture diffusivity Dw.
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For User defined, set a value for the Capillary liquid flux density, Γc, to characterize the liquid transport as a function of the moisture content.
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For van Genuchten, enter an Entry capillary pressure pec (SI unit: Pa), the Constitutive relations constant mvg, the Constitutive relations constant lvg (dimensionless), the Liquid water residual saturation srl, and the Moist air residual saturation srm.
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For Brooks and Corey, enter an Entry capillary pressure pec (SI unit: Pa) and the Pore size distribution index λp, the Liquid water residual saturation srl, and the Moist air residual saturation srm.
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