ABAQUS Keywords Reference Manual  

*FLUID PROPERTY
Define properties for hydrostatic fluid elements.

This option is used to define properties for hydrostatic fluid elements associated with a given fluid cavity.

Products: ABAQUS/Standard  ABAQUS/Explicit  

Type: Model data

Level: Part  Part Instance  

References:

Required parameters:

ELSET

Set this parameter equal to the name of the element set containing the hydrostatic fluid elements for which properties are being defined.

REF NODE

Set this parameter equal to either the node number of the fluid cavity reference node or the name of a node set containing the fluid cavity reference node. If the name of a node set is chosen, the node set must contain exactly one node.

TYPE

This parameter applies only to ABAQUS/Standard analyses. ABAQUS/Explicit uses only pneumatic fluids to model the fluid within a cavity (see “Hydrostatic fluid models,” Section 12.4.1 of the ABAQUS Analysis User's Manual, for more information).

Set TYPE=HYDRAULIC to specify an incompressible or approximately incompressible fluid.

Set TYPE=PNEUMATIC to specify a compressible fluid that behaves as an ideal gas.

Set TYPE=USER to specify a fluid in which the fluid constitutive model is defined in user subroutine UFLUID.

Optional parameters:

AMBIENT

This parameter specifies the magnitude of the ambient pressure, which will typically be atmospheric pressure. It is relevant only for TYPE=PNEUMATIC. The default is AMBIENT=0.

NAME

This parameter applies only to ABAQUS/Standard analyses.

Set this parameter equal to the name to be used to identify the fluid property definition. The name given can be used to identify the fluid property definition in user subroutine UFLUID.

Data line for two-dimensional elements: 

First (and only) line:

  1. Element thickness.

To define fluid properties for three-dimensional and axisymmetric elements: 

There are no data lines required.

To define the fluid model by using a user subroutine: 

No data lines are used with this option when TYPE=USER is specified. Instead, user subroutine UFLUID must be used to define the fluid model.