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Defining Physics and Conditions

The physics and conditions are specified as follows.

Adding Modules
  1. Click Select Modules in the Model Panel. The Physical Model Selection dialog box opens.
  2. Radial Pistons is automatically added to the Model Panel by the Rotor Template Mesher.
  3. Select Cavitation under Available Modules and click Add.
  4. Click Close to close the Physical Model Selection dialog box.

 

Figure 6.386 - Adding modules

General Operating Parameters
  1. Select Radial Pistons in the Model Panel.
  2. Enter Number of Revolutions as 4 and Time Steps Per Piston Rotation as 40 for Time Definition in the Model Tab of Properties Panel.
  3. Enter the parameters for Angular Velocity Definition as follows.

    • Center of Rotation: 0, 0, 0

    • Reference Direction: 0, 1, 0
    • Rotational Direction: Clockwise

    • Rotational Speed: 1000 rpm
    • Rotational Axis Vector: 0,0,1
    • Cap Radius (>0)0.02562m

 

 

Figure 6.387 - Operating parameters

´ Note: 
  1. Some parameters such as Number of Pistons and Center of Rotation in the radial pistons module are automatically defined by the Rotor Template Mesher.
  2. The Number of Pistons is used for calculating the time-step. The Number Steps Per Piston Rotation determines the angle of rotation each time-step.

 

Boundary Conditions

The boundary conditions are specified as follows:

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

Figure 6.388 - Inlet conditions

 

Outlet
  1. Select outlet_outlet from the Boundaries list in the Geometric Entities Panel.

  2. Select Outlet from the Radial Pistons drop-down list in the Model Tab of Properties Panel.
  3. Enter Outlet Pressure as 500000 Pa.

 

 

 

 

Figure 6.389 - Outlet conditions

Fluid Properties
  1. Select Volumes in the Geometric Entities Panel.
  2. Select Model Tab of Properties Panel.
  3. 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 as follows.

    • Gas Mass Fraction: 9e-05
    • Operating Temperature: 300 K
  •  

    Figure 6.390 - Fluid properties

     

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