Simulation

This section explains the settings to run the rolling piston compressor with valve simulation.

Create Monitoring Points

A monitoring point is created to monitor variables, such as pressure at the port. The steps to create the monitoring points are as follows.

1. On the Geometric Entities Panel toolbar, click on Create a Monitoring Point icon, to create Point 01 under Points. Rename Point 01 as port_point.
2. Select port_point and specify the Position values as -0.008, 0.025, 0.01 in the Geometry Tab of Properties Panel (see, Figure 17.74).

 

Note: Monitoring points need to be created before running the simulation for recording data, (refer Figure 17.75).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 17.74 - Create a monitor point

Figure 17.75 - Monitoring points

 

Transient simulation

1. Click Simulation Panel.
2. Enter Number of Iterations and Result Saving Frequency as 25 and 180. The Number of Revolutions, Simulation Time (Duration) and the Number of Time Steps are automatically preset by the Rolling Piston module (see, Figure 17.76) .
3. After you save the project with the name rollingpiston_withvalve_model.spro, click Start to run the simulation.

4. A warning message pops-up. Click Continue to run in "version 4 compatibility mode".

5. The result files are saved as *.sres in the working folder (Example: "rollingpiston_withvalve_model_0180.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 17.77).

 

Figure 17.76 - Simulation settings

Figure 17.77 - Residuals - Rolling Piston compressor with 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.