*FLUID LEAKOFF

Define fluid leak-off coefficients for pore pressure cohesive elements and enriched elements.

This option is used to define leak-off coefficients for pore pressure cohesive elements and enriched elements.

This page discusses:

See Also
In Other Guides
Defining the Constitutive Response of Fluid within the Cohesive Element Gap
UFLUIDLEAKOFF
Defining the Constitutive Response of Fluid Flow within the Cracked Element Surfaces

Products Abaqus/Standard Abaqus/CAE

Type Model data

LevelModel

Abaqus/CAE Property module

Optional, mutually exclusive parameters

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the fluid leak-off coefficients, in addition to temperature. If this parameter is omitted, it is assumed that the leak-off coefficients are constant or depend only on temperature. See Material Data Definition for more information.

USER

Include this parameter to indicate that user subroutine UFLUIDLEAKOFF will be used to define the fluid leak-off coefficients.

Optional parameters

SLURRY

Include this parameter to account for the evolution of the filter cake thickness, viscosity, and permeability.

Data lines to define fluid leak-off coefficients if the USER parameter is omitted

First line

  1. Fluid leak-off coefficient at top element surface.

  2. Fluid leak-off coefficient at bottom element surface.

  3. Temperature.

  4. First field variable.

  5. Etc., up to six field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than six)

  1. Seventh field variable.

  2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to specify K as a function of temperature and field variables.

Data line to define the filter cake coefficients if the SLURRY parameter is included and the USER parameter is omitted

First (and only) line

  1. Initial filter cake thickness h 0 .

  2. Correction factor, C f , to account for variation in particle sizes.

  3. Filter cake compressibility coefficient α . Enter a value of 0 if the filter cake is incompressible.

  4. Filter cake permeability factor, C d . This value is calculated automatically if this field is left blank.

There are no data lines when the USER parameter is included