About Pore Fluid Flow Properties

Abaqus allows specific properties to be defined for a fluid-filled porous material. In Abaqus/Standard, this type of porous medium is considered in a coupled pore fluid diffusion/stress analysis (Coupled Pore Fluid Diffusion and Stress Analysis). In Abaqus/Explicit, this type of porous medium is considered in an undrained pore fluid flow and stress analysis (Undrained Pore Fluid Flow and Stress Analysis).

The following properties are available:

Permeability

Permeability defines the relationship between the flow rate of a liquid through a porous medium and the gradient of the piezometric head of that fluid (see Permeability) in Abaqus/Standard analyses.

You cannot specify permeability in an undrained pore fluid flow and stress analysis (where the permeability is assumed to be zero) in Abaqus/Explicit.

Porous bulk moduli

The bulk moduli of the solid grains and of the fluid in a porous medium are defined such that their compressibility is considered in an analysis (see Porous Bulk Moduli).

Sorption

Sorption defines the absorption/exsorption behavior of a porous material under partially saturated flow conditions (see Sorption) in Abaqus/Standard analyses.

You cannot specify sorption in an undrained pore fluid flow and stress analysis (where the flow is assumed to be fully saturated) in Abaqus/Explicit.

Swelling gel

The swelling gel model is used to simulate the growth of gel particles that swell and trap wetting liquid in a partially saturated porous medium (see Swelling Gel).

Swelling gel applies only to Abaqus/Standard analyses.

Moisture swelling

Moisture swelling defines the saturation-driven volumetric swelling of a porous medium's solid skeleton under partially saturated flow conditions (see Moisture Swelling).

Moisture swelling applies only to Abaqus/Standard analyses.

Thermal Expansion

For porous media such as soils or rock, you can define the thermal expansion of both the solid grains and the permeating fluid. For more information, see Thermal Expansion.