This option is used to define the fluid exchange property for flow between two fluid cavities or between a fluid cavity and its environment.
Product: ABAQUS/Explicit
Type: Model data
Level: Model
Set this parameter equal to a name that will be used to refer to the fluid exchange property.
Set TYPE=BULK VISCOSITY to define fluid exchange where the mass flow rate is related to the pressure difference by both viscous and hydrodynamic resistance coefficients.
Set TYPE=FABRIC LEAKAGE to define fluid exchange due to fabric leakage.
Set TYPE=MASS FLUX to define fluid exchange by specifying the mass flow rate leakage explicitly.
Set TYPE=MASS RATE LEAKAGE to define fluid exchange by specifying the mass flow rate as a function of pressure difference and temperature.
Set TYPE=ORIFICE to define fluid exchange through a vent orifice.
Set TYPE=VOLUME FLUX to define fluid exchange by specifying the volume rate leakage explicitly.
Set TYPE=VOLUME RATE LEAKAGE to define fluid exchange by specifying the volume rate leakage as a function of pressure difference and temperature.
Set this parameter equal to the number of field variables included in the specification of the coefficients defined by the TYPE parameter. If this parameter is omitted, the coefficients are assumed not to depend on any field variables.
First line:
Viscous resistance coefficient.
Hydrodynamic resistance coefficient.
Average absolute pressure, if pressure dependent.
Average temperature, if temperature dependent.
First field variable.
Second field variable.
Etc., up to four field variables.
Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four):
Fifth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to specify the viscous and hydrodynamic resistance coefficients as functions of average absolute pressure, average temperature, and other predefined field variables.
First line:
Discharge coefficient that is used to modify the exhaust or leakage surface area. The default value is 1.
Absolute pressure, if pressure dependent.
Temperature, if temperature dependent.
First field variable.
Second field variable.
Etc., up to five field variables.
Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five):
Sixth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to define the discharge coefficient as a function of pressure, temperature, and other predefined field variables.
First (and only) line:
Mass flow rate per unit area.
First line:
Absolute value of the mass flow rate per unit area. (The first tabular value entered must always be zero.)
Absolute value of the pressure difference. (The first tabular value entered must always be zero.)
Average absolute pressure, if pressure dependent.
Average temperature, if temperature dependent.
First field variable.
Second field variable.
Etc., up to four field variables.
Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four):
Fifth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to specify the mass flow rate as a function of pressure difference, average absolute pressure, average temperature, and other predefined field variables.
First (and only) line:
Volumetric flow rate per unit area.
First line:
Absolute value of the volumetric flow rate per unit area. (The first tabular value entered must always be zero.)
Absolute value of the pressure difference. (The first tabular value entered must always be zero.)
Average absolute pressure, if pressure dependent.
Average temperature, if temperature dependent.
First field variable.
Second field variable.
Etc., up to four field variables.
Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four):
Fifth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines as often as necessary to define the volume rate leakage as a function of pressure difference, average absolute pressure, average temperature, and other predefined field variables.