Two-Way Radio User Manual

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PERMEABILITY
16.6
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PERMEABILITY: D efine permeability for pore fluid flow.
This option is used to define permeability for pore fluid flow in problems involving seepage.
Product: ABAQUS/Standard
Type: Model data
Level: Model
Reference:
•
“Permeability,” Section 20.7.2 of the ABAQUS A nalysis User’s Manual
Optional parameters:
DEPENDENCIES
Set this parameter equal to the number of field variable dependencies included in the definition of the
permeability. If this parame ter is omitted, it is assumed tha t the permeability is independent of field
variables. See “Specifying field variable dependence” in “Material data definition,” Section 16.1.2
of the ABAQUS Analysis User’s Manu al, for more information.
This parameter can be used only in conjunction with TYPE=ISOTROPIC, ORTHOTROPIC,
or ANISOTROPIC.
TYPE
Set TYPE=ISOTROPIC (defa ult) to define fully saturated isotropic permea bility.
Set TYPE=ORTHOTROPIC to define fully saturated orthotropic permeability. Set
TYPE=ANISOTROPIC to define fully s aturated anisotropic permeability.
Set TYPE=SATURATION to define
; this must be a repeated use of t he option for the
same material and must follow the definition of fully saturated permeability. The definition must
give
for ,with at .
Set TYPE=VELOCITY to define
; this must be a repeated use of the option for the same
material and must follow the de finition of fully saturated per meability.
Required parameter when fully saturated material properties are defined:
SPECIFIC
Set this parameter equal to the specific weight of the wetting liquid,
(units of FL
−3
). The actual
specific weight value must be given, and the GRAV distributed load type must be used to apply the
gravitational loading if a total pres sure solution is required (see “Coupled pore fluid diffusion and
stress analysis,” Section 6.7.1 of the ABAQ US Analysis U ser’s Manual, for a discussion of total
and excess pressure solutions).
16.6–1
ABAQUS Version 6.1 Module:
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