ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE
TypeModel data
LevelModel
Abaqus/CAEInteraction module
Required parameters
- NAME
-
Set this parameter equal to a label that will be used to refer to the fluid
cavity.
- 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.
Required, mutually exclusive parameters
- BEHAVIOR
-
Set this parameter equal to the name of the
FLUID BEHAVIOR option defining the fluid behavior.
- MIXTURE
-
This parameter applies only to
Abaqus/Explicit
analyses.
Set MIXTURE=MASS FRACTION (default) to use the mass fraction if the fluid in the fluid
cavity is a mixture of ideal gases.
Set MIXTURE=MOLAR FRACTION to use the molar fraction if the fluid in the fluid cavity is
a mixture of ideal gases.
Optional parameters
- ADDED VOLUME
-
Set this parameter equal to the magnitude of the additional volume for the
fluid. The additional volume will be added to the actual volume of the cavity
that is calculated.
- ADIABATIC
-
This parameter applies only to
Abaqus/Explicit
analyses.
This parameter is relevant only when an ideal gas model is used. Include
this parameter if adiabatic behavior is assumed for the ideal gas.
- AMBIENT PRESSURE
-
Set this parameter equal to the magnitude of the ambient pressure. For a
pneumatic fluid, the ambient pressure will typically be atmospheric pressure.
- AMBIENT TEMPERATURE
-
This parameter applies only to
Abaqus/Explicit
analyses and is relevant only when heat energy flow is defined for a pneumatic
fluid with adiabatic behavior.
Set this parameter equal to the magnitude of the ambient temperature. The
ambient temperature will typically be atmospheric temperature.
- CHECK NORMALS
-
This parameter is relevant only when the surface is defined to form the
boundary of the fluid cavity.
Set CHECK NORMALS=YES (default) to check the consistency of the surface normals.
Set CHECK NORMALS=NO to skip the consistency checking for the surface normals.
- MINIMUM VOLUME
-
This parameter applies only to
Abaqus/Explicit
analyses.
Use this parameter to define the magnitude of the minimum volume for the
fluid cavity. If the volume of the cavity (which is equal to the actual volume
plus the added volume) drops below the minimum, the minimum value will be used
to evaluate the equation of state model.
Set this parameter equal to a positive value to define the minimum volume
directly.
Set MINIMUM VOLUME=INITIAL VOLUME to set the minimum volume equal to the initial volume of the
cavity. If the initial volume of the fluid cavity is a negative value, the
minimum volume will be set equal to zero.
- SURFACE
-
This parameter is always required in
Abaqus/Standard
analyses. In
Abaqus/Explicit
analyses this parameter is required if the ADDED VOLUME parameter is omitted.
Set this parameter equal to the name of the surface forming the boundary of
the fluid cavity.
- SWITCHTIME
-
This parameter applies only to
Abaqus/Explicit
analyses to switch from the lumped kinetic molecular procedure to the uniform
pressure method.
Set the value of the parameter equal to the time at which
Abaqus/Explicit
is to switch from the lumped kinetic molecular procedure to the uniform
pressure method.
Data line if
the BEHAVIOR parameter is included
- First (and only) line
-
-
Out-of-plane thickness of the surface for two-dimensional models when the SURFACE parameter is included. If this value is left blank or is
entered as zero, the default value of 1.0 will be used. Enter a blank line when
the surface is defined by three-dimensional and axisymmetric elements or when
the SURFACE parameter is omitted.
Data lines if
the MIXTURE parameter is included
- First line
-
-
Out-of-plane thickness of the surface for two-dimensional models when the SURFACE parameter is included. If this value is left blank or is
entered as zero, the default value of 1.0 will be used. Enter a blank line when
the surface is defined by three-dimensional and axisymmetric elements or when
the SURFACE parameter is omitted.
- Second line
-
-
Name of fluid behavior forming the gas mixture.
-
Mass fraction or molar fraction.
Repeat this data line as
often as necessary to define the initial gas
mixture.