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Simulation

This section explains the settings to run the gerotor pump simulation.

Creating Monitoring Points

In a gerotor pump simulations, inherent flow ripples are caused by the pumping mechanism, which are of interest in the analysis. Hence, monitoring points are created at the groove and entry to the outlet, after the pumping chamber The steps to create the monitoring points are as follows:

1. On the Geometric Entities Panel toolbar, click double Create a Monitoring Point icon, to create Points Point 01 and Point 02.
2. Rename Point 01 as outlet_top.

3. enter 0.025, -0.02, 0.001 for Position in the Geometry Tab of Properties Panel (see, Figure 6.121).

4. Rename Point 02 as outlet_bot.
5. Enter 0.025, -0.02, -0.035 for Position in the Geometry Tab of Properties Panel.

´	Note:  Monitoring points need to be created before running the simulation for recording data (see, Figure 6.122). 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 6.121 - Monitoring point - Outlet top

Figure 6.122 - Monitoring points

 

Simulation Settings

1. Click Simulation Panel.
2. Define Number of Iterations and Result Saving Frequency as 50 and 160 respectively. The Number of Revolutions, Simulation Time (Duration) and the Number of Time Steps are automatically preset by the Gerotor module (see, Figure 6.123).
3. After you save the project, click Start to run the simulation.
4. The result files are saved as .sres in the working folder (Example : "gerotorpump_160.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 6.124).

Figure 6.123 - Simulation settings

Figure 6.124 - Residuals-Gerotor

 

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.