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You are here: Fluid Machinery Templates and Tutorials > Swash Plate Piston Pump > Swash Plate Piston Pump Tutorial > Defining Physics and Conditions

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. Swash Plate Piston 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 6.435 - Adding modules
General Operating Parameters
  1. Select Swash Plate Piston in the Model Panel.
  2. Enter Number of Revolutions as 3 and Time Steps Per Piston Rotation as 30 for Time Definition in the Model Tab of Properties Panel.

  3. Enter the parameters forthe Angular Velocity Definition as follows.

    • Swash Plate Normal: -0.315, 0, 1

    • Rotational Direction: Clockwise

    • Rotational Speed: 1800 rpm

 

 

  

Figure 6.436 - Operating parameters
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Note: 

  • The inclination of the swash plate is specified in terms of the Swash Plate Normal.
  • Some parameters such as Number of Pistons, Swash Plate Center and Rotational Axis Vector in the Swash Plate Piston Module are automatically defined by the Rotor Template Mesher.

  • The Number of Pistons is used for calculating the time-step. The Time Steps Per Piston Rotation determines the angle of rotation each time-step.
Boundary Conditions

In this section, the boundary conditions are specified.

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

Figure 6.437 - Inlet conditions
Outlet

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

  2. Select Outlet from the Swash Plate Piston drop-down list in the Model Tab of Properties Panel.
  3. Enter 1e+07 Pa for Outlet Pressure.

 

  

Figure 6.438 - Outlet conditions
Fluid Properties
  1. Select Volumes in the Geometric Entities Panel.
  2. Select Model Tab in the 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 list as follows.

    • Gas Mass Fraction: 9e-05
    • Operating Temperature: 300 K
    • Starting Pressure: 101325 Pa
    		•   

    Figure 6.439 - Fluid properties


     

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