You can define specific properties for a fluid-filled porous material. This type of porous medium is considered in a coupled pore fluid diffusion/stress analysis (Coupled pore fluid diffusion and stress analysis).
Defining a swelling gel Defining moisture swelling Defining anisotropic swelling Defining permeability Defining pore fluid expansion Defining porous bulk moduli Defining sorption Defining normal flow across gap surfaces Defining tangential flow across gap surfaces