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11.5.3 Simulation

This section explains the settings to run the VOF simulation

Creating Monitoring Points

The steps are as follows:

1. On the Geometric Entities Panel toolbar, click Create a Monitoring Point icon, to create point. The Point 01 is created under Points.
2. Rename Point 01 and specify their Position values as shown in Table 11.5 in the Geometry Tabof Properties Panel (see, Figure 11.119).
3. Select Tank_pressure point under the Points.
4. In the Model Tab of Properties Panel, select Yes for Output Properties under Flow list, to output pressure.

Points	Rename as	Position values (m)
Point 01	Tank_pressure point	3.8012, -2.615, 0.3226

Table 11.5 - Monitoring point

Note: Monitoring points need to be created before running the simulation for recording data (see, Figure 11.120). The position of a points may also be dragged to a new location using the Select option (Toolbar) and the Left Mouse Button.

 

Figure 11.119 - Create monitoring point

Figure 11.120 - Monitoring point

Simulation Settings

1. Select Simulation Panel, verify that the Simulation Time (Duration) and Number of Time Steps to 25 s and 2500 respectively.
2. Verify that the Result Saving Frequency is 10 (see, Figure 11.121).
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:tank_filling_model_10.sres). This file is overwritten depending 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.

 

Figure 11.121 - Simulation settings

Figure 11.122 - Residual - VOF

 

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.