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Simulation

This section explains the settings to run the scroll compressor simulation.

Creating Monitoring Points

In a scroll compressor simulations, inherent flow ripples are caused by the rotating mechanism, which are of interest in the analysis. Hence, monitoring points are created at the outlet.

The steps to create the monitoring points are as follows:

1. Click three times Create a Monitoring Point icon in the Geometric Entities Panel toolbar, to create Points Point 01, Point 02 and Point 03.
2. Rename the Points and specify their Position values as shown in Table 6.43 in the Geometry Tab of Properties Panel (see,Figure 6.826).

Points	Rename as	Position values (m)
Point 01	stator_center_point	0, 0, 0
Point 02	rotor_center_point	-0.0016505829, 0.0014955489, 0
Point 03	Outlet_pressure_point	0, 0, -0.011
Point 04	Pocket_point	0.0136763, -0.009745, 0.0101328

Table 6.43 - Rename monitoring points

 

´	Note: Monitoring points need to be created before running the simulation for recording data (see, Figure 6.827). 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 6.826 - Monitoring point - stator_center_point

Figure 6.827 - Monitoring points

 

Simulation Settings

1. Click Simulation Panel.
2. Define Number of Iterations and Result Saving Frequency as 50 and 120 respectively. The Number of Revolutions, Simulation Time (Duration) and the Number of Time Steps are automatically preset by the Scroll module (see, Figure 6.828).
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 : "scroll_prepared_model_120.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 6.829).

Figure 6.828 - Simulation settings

Figure 6.829 - Residuals - scroll

 

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.