You use a fluid exchange interaction property to define the method of fluid transfer between a cavity and the environment or between two cavities. A fluid exchange interaction property can be referred to only by a fluid exchange interaction. For more information, see “Defining a fluid exchange interaction,” Section 15.13.12.
To define a fluid exchange interaction property:
From the main menu bar, select Interaction
PropertyCreate.
In the Create Interaction Property dialog box that appears, do the following:
Name the interaction property. For more information about naming objects, see “Using basic dialog box components,” Section 3.2.1.
Select the Fluid exchange type of interaction property.
Click Continue to close the Create Interaction Property dialog box.
Abaqus/CAE opens the Edit interaction property dialog box.
Choose one of the following fluid exchange definitions:
Bulk viscosity
The fluid exchange rate is based on the viscous resistance coefficient and the hydrodynamic resistance coefficient. Both coefficients may include dependence on the average absolute pressure, average temperature, and the average value of any user-defined field variables.
Mass flux
The fluid exchange rate is based on the mass flow rate per unit area for the effective area defined in the fluid exchange interaction.
Mass rate leakage
The fluid exchange rate is based on a mass flow rate driven by the absolute value of the pressure differential between the primary cavity and the environment or the second cavity. The mass flow rate and the absolute value of the pressure difference both start at zero and must be positive. Mass rate leakage may include dependence on the average absolute pressure, average temperature, and the average value of any user-defined field variables.
Volume flux
The fluid exchange rate is based on the volumetric flow rate per unit area for the effective area defined in the fluid exchange interaction.
Volume rate leakage
The fluid exchange rate is based on a volume flow rate driven by the absolute value of the pressure differential between the primary cavity and the environment or the second cavity. The volume flow rate and the absolute value of the pressure difference both start at zero and must be positive. Volume rate leakage may include dependence on the average absolute pressure, average temperature, and the average value of any user-defined field variables.
If you selected the Bulk viscosity, Mass rate leakage, or Volume rate leakage fluid exchange definition, do the following to complete the fluid exchange property definition:
Toggle on the desired options to add data columns to the table.
You can add pressure- or temperature-dependent data, and you can add field variables.
In the data table, enter the appropriate data as a function of temperature, pressure, and field variables. You can enter data into the table using the keyboard. Alternatively, you can click mouse button 3 anywhere in the table to view a list of options for specifying tabular data. For detailed information on each option, see “Entering tabular data,” Section 3.2.7.
If you selected the Mass flux or Volume flux fluid exchange definition, enter the mass flow rate per unit area or volumetric flow rate per unit area, respectively.
Click OK to create the fluid exchange interaction property and to exit the editor.
