Defining Physics and Conditions

The physics and conditions are specified as follows

Click Select Modules in the Model Panel. The Physical Model Selection dialog box opens.
Gear is automatically added to the Model Panel by the Rotor Template Mesher.
Select Cavitation under Available Modules and click Add.
Click Close to close the Physical Model Selection dialog box.

Figure 6.175 - Adding modules

Select Gear in the Model Panel.
Enter Number of Revolutions and Time Steps Per Inner Tooth Rotation to 3 and 40 respectively for the Time Definition in the Model Tab of Properties Panel.
Enter the parameters for the Angular Velocity Definition as follows.
- Rotational Direction: Counterclockwise
- Rotational Speed: 5000 rpm
- Rotational Axis Vector: 0,0,1

Figure 6.176 - Operating parameters

The boundary conditions are specified as follows:

Select inlet_inlet from the Boundaries list under Volumes in the Geometric Entities Panel.
Select Inlet from the Gear drop-down list in the Model Tab of Properties Panel.
Enter Inlet Pressure as 101325 Pa.

Figure 6.177 - Inlet conditions

Select outlet_outlet from the Boundaries list in the Geometric Entities Panel.
Select Outlet from the Gear drop-down list in the Model Tab of Properties Panel.
Enter Outlet Pressure as 500000 Pa.

Figure 6.178 - Outlet conditions

Select Volumes in the Geometric Entities Panel.
Select Model Tab of Properties Panel.
Enter the parameters for Property list as follows.
- Material: Oil
- Dynamic Viscosity: 0.007 Pa-s
- Density: 800 kg/m³
- Liquid Bulk Modulus(B0): 1.5e+09 Pa
- Liquid Reference Pressure: 101325 Pa
- Saturation Pressure: 400 Pa
Enter the parameters for Operating Conditions list as follows.
- Gas Mass Fraction: 9e-5
- Operating Temperature: 300 K
- Starting Pressure: 101325 Pa

Figure 6.179 - Fluid properties