Defining tangential flow across gap surfaces

From the menu bar in the Edit Material dialog box, select OtherPore FluidGap Flow.

(For information on displaying the Edit Material dialog box, see Creating or editing a material.)

Click the arrow to the right of the Type field, and specify how you want to define the flow parameters:

Select Newtonian to define the viscosity for a Newtonian fluid.
Select Power law to define the consistency and exponent for a power law fluid.
Select Bingham plastic to define the consistency and yield stress for a Bingham plastic fluid.
Select Herschel-Bulkley to define the consistency, exponent, and yield stress for a Herschel-Bulkley fluid.

Toggle on Use temperature-dependent data to define the flow parameters as a function of temperature.

A column labeled Temp appears in the Data table.

Click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables on which the flow parameters depend.

If you selected Newtonian in Step 2, you can toggle on Maximum permeability to enter the maximum permeability value that Abaqus can use.

If you selected Newtonian in Step 2, enter the following data in the Data table:

Viscosity: Pore fluid viscosity, $μ$ .
Temp: Temperature.
Field n: Predefined field variables.

For detailed information on how to enter data, see Entering tabular data.

If you selected Power law in Step 2, enter the following data in the Data table:

Consistency: Fluid consistency, K.
Exponent: Power law exponent, $α$ .
Temp: Temperature.
Field n: Predefined field variables.

For detailed information on how to enter data, see Entering tabular data.

If you selected Bingham plastic in Step 2, enter the following data in the Data table:

Consistency: Fluid consistency, K.
Exponent: Power law exponent, $α$ .
Yield Stress: Yield stress, $τ_{0}$ .
Temp: Temperature.
Field n: Predefined field variables.

For detailed information on how to enter data, see Entering tabular data.

If you selected Herschel-Bulkley in Step 2, enter the following data in the Data table:

Consistency: Fluid consistency, K.
Yield Stress: Yield stress, $τ_{0}$ .
Temp: Temperature.
Field n: Predefined field variables.

For detailed information on how to enter data, see Entering tabular data.

Click OK to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see Browsing and modifying material behaviors, for more information).