You are here: Fluid Machinery Templates and Tutorials > Ball Valve > Ball Valve Tutorial > Simulation

Simulation

This section explains the settings to run the ball valve simulation.

Create Monitoring Points

Monitoring points are created to monitor variables, such as pressure at different regions in the domain. The steps to create the monitoring points are as follows.

1. On the Geometric Entities Panel toolbar, click two times on Create a Monitoring Point icon, to create Points Point 01 and Point 02.
2. Rename the points and specify their Position values as shown in Table 6.35 in the Geometry Tab of Properties Panel (see, Figure 6.620).

Points	Rename as	Position Values
Point 01	highpressure_point	0, 0.0095, 0
Point 02	lowpressure_point	0, -0.01, 0

Table 6.35 - Rename monitoring points

 

Note: Monitoring points need to be created before running the simulation for recording data, (refer Figure 6.621).The position of a Points may also be dragged to a new location using the Select icon in Toolbar and the Left Mouse Button.

 

Figure 6.620 - Create monitor points

Figure 6.621 - Monitoring points

 

Transient simulation

1. Click Simulation Panel.
2. Enter Number of Iterations and Result Saving Frequency as 20 and 80 respectively. The Number of Cycles, Simulation Time (Duration) and the Number of Time Steps are automatically preset by the Ball Valve module (see, Figure 6.622) .
3. After you save the project, click Start to run the simulation. Click Continue in the ensuing dialog box.
4. The result files are saved as *.sres in the working folder (Example : "ballvalve_model_0080.sres"). The number of result files depends on the Result Saving Frequency.

Note: The Result Saving Frequency option in the Simulation Panel is set to a small value (say 5 or 10) before running the simulation to obtain better animations.

The residuals are displayed under the Residual Tab in the Plot Panel (see, Figure 6.623).

 

Figure 6.622 - Simulation settings

Figure 6.623 - Residuals - Ball valve

 

´	Note: The default Converge Criterion is 0.1 for Transient simulations. When the residuals for all the variables drop by one order or the maximum Number of Iterations is reached, the calculation proceeds to the next time-step.