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Simulation

This section explains the settings to run the bent axis piston pump simulation.

Creating Monitoring Points

In bent axis piston 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 at the outlet and one of the cylinder pockets. The steps to create the monitoring points are as follows :

1. On the Geometric Entities Panel toolbar, click five times Create a Monitoring Point icon, to create Points Point 01 to Point 05.
2. Rename the Points as shown in Table 6.25 and specify their Position values in the Geometry Tab of Properties Panel, (see Figure 6.498).

Points	Rename as	Position values
Point 01	Cylinder_point	-0.035, 0, 0.1
Point 02	Outlet_point	0, 0.04, 0.175
Point 03	Ball Joint 1	-0.0417, 0, 0
Point 04	Ball Joint 2	0.0417, 0, 0
Point 05	Axis Joint	0, 0, -0.01

Table 6.25 - Rename monitoring points

´	Note: Monitoring points need to be created before running the simulation for recording data (see, Figure 6.499.). The position of a Points may also be dragged to a new location using the Select icon in Toolbarand the Left Mouse Button.

Figure 6.498 - Create monitoring point

Figure 6.499 - Monitoring points

 

Simulation Settings

1. Click Simulation Panel.
2. Define Number of Iterations and Result Saving Frequency to 50 and 360. The Number of Revolutions, Simulation Time (Duration) and the Number of Time Steps are automatically preset by the Bent Axis Piston module (see, Figure 6.500).
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 : "bentaxispistonplate_360.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 6.501).

Figure 6.500 - Simulation settings

Figure 6.501 - Residuals - Bent axis piston

 

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.