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.
Ball3D Valve, Translation (1 DOF) Ball_main, Translation (1 DOF) Ball_second and Translation (1 DOF) Ball_third are automatically added to the Model Panel by the Valve Template Mesher.
Select Turbulence and Cavitation under Available Modules list and click Add.
Click Close to close the Physical Model Selection dialog box.

Figure 6.649 - Adding modules

Select Ball3D Valve in the Model Panel.
Select Extended Mode for the Setup Options drop-down list in the Model Tab of Properties Panel.
Verify that ballCAD is selected for Ball CAD and outerCAD is selected for Outer CAD.
Verify that CAD Centre is 0,-0.015,0.
Verify that Main Direction is 0,-1,0.
Select Number of Dynamics as Three DOFs.
Set Second Direction as 0,0,0.
Set Ball Mass as 0.004.
Set Minimum Gap Size as 2e-05 m and Maximum Displacement as 0.002 m.

Figure 6.650 - Ball3d operating parameters

Figure 6.651 - Flow parameters

Select Translation (1 DOF) Ball_main in the Model Panel.
Select Advanced Mode for the Setup Options drop-down list in the Model Tab of Properties Panel.
Enter the parameters for Time Definition as follows:
- Number of Cycles: 10
- Number of Time Steps per Cycle: 100
- Motion Frequency: 400 Hz
Select Force Balance in the Motion Type drop-down list.
Enter the parameters for Motion Type as follows:

Figure 6.652 - Translation (1 DOF) Ball_main operating parameters

´	Note: The Number of Time Steps per Cycle is an important parameter and must be large enough to achieve a smooth solution.

Select Translation (1 DOF) Ball_second in the Model Panel.
Select Advanced Mode for the Setup Options drop-down list in the Model Tab of Properties Panel.
Select Force Balance in the Motion Type drop-down list.
Enter the parameters for Motion Type as follows:
- Initial Displacement: 0.0001 m
- Spring Constant: 1000 N/m
- Damping Coefficient: 1 N-s/m
Set Minimum Displacement as -0.002 and Maximum Displacement as 0.002.

Figure 6.653 - Translation (1 DOF) Ball_second operating parameters

Note: An initial displacement of 0.0001 m is provided in the second direction for demonstration of 3D movement of the ball valve.

Select Translation (1 DOF) Ball_third in the Model Panel.
Select Advanced Mode for the Setup Options drop-down list in the Model Tab of Properties Panel.
Select Force Balance in the Motion Type drop-down list.
Enter the parameters for Motion Type as follows:
- Spring Constant: 1000 N/m
- Damping Coefficient: 1 N-s/m
Set Minimum Displacement as -0.002 and Maximum Displacement as 0.002.

Figure 6.654 - Translation (1 DOF) Ball_third operating parameters

The boundary conditions for the Ball 3D valve are specified as follows:

Select Boundaries from the Geometric Entities Panel.
In the Model Tab of Properties Panel, verify the boundary type for the ball3d drop-down list as Ball Wall for ball3d_valve_inner boundary.

Note: The boundary conditions for the ball 3D valve volume generated using the Ball Valve Template Mesher are automatically set by the template.

Select inlet_inlet from the Boundaries list in the Geometric Entities Panel.
Select Inlet from the ball3d drop-down list in the Model Tab of Properties Panel.
Enter Inlet Pressure as 20 bar.
Select Fully Developed for Velocity Profile under Flow.

Figure 6.655 - Inlet conditions

Select outlet_outlet from the Boundaries list under Volumes in the Geometric Entities Panel.
Select Outlet from the ball3d drop-down list in the Model Tab of Properties Panel.
Select Specified Total Pressure for the Flow drop-down list.
Enter Total Pressure as 17 bar.

Figure 6.656 - Outlet conditions

Enter the parameters for Operating Conditions as follows, except for Inlet volume.

Select Inlet volume in the Geometric Entities Panel, enter the parameters for Operating Conditions as follows:

Figure 6.657 - Fluid properties