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11.1.3 Simulation

This section explains the settings to run the cyclone separator simulation.

Creating Monitoring Points

In a cyclone separator simulation, the pressure gradient is developed in the body. Hence, monitoring points are created at the centre if the body and entry to the bin. The steps to create the monitoring points are as follows:

1. On the Geometric Entities Panel toolbar, click Create a Monitoring Point twice, to create Point 01 and Point 02 under Points.
2. Rename Point 01 as Center_point.
3. Enter 0, -0.45, 0 for Position in the Geometry Tab of Properties Panel (see Figure 11.14).
4. Rename Point 02 as Bin_point.
5. Enter 0, -1.65, 0 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 11.15). The position of a Points may also be dragged to a new location using the Select  in Toolbar and the Left Mouse Button.

 

Figure 11.14 - Creating point

Figure 11.15 - Monitoring points

 

Note: Initially Steady State Simulation is performed without Particles. Once the flow is developed, Transient Simulations is performed without Flow and Particle module.

Steady Simulation Settings

In the Model Panel, select Flow and Turbulence check boxes only. In the Simulation Panel select Steady radio button. Enter Number of Iterations as 500 and Result Saving Frequency as 100 . Verify that the Start from Initial Values button is selected. After you save the project, click Start to run the simulation. The result files are saved as .sres in the working folder (Example: "cyclone_separator_model.sres").

Figure 11.16 - Steady simulation modules

 

Figure 11.17 - Steady simulation settings

Figure 11.18 - Steady -Residual graph

 

	Note: For a Steady State Simulation, the result file is saved as .sres in the working folder and the same file gets overwritten at regular intervals specified by the Result Saving Frequency parameter. The final result file is written at the end of all iteration or when the solution converges.
	Note: The default Converge Criterion is 0.001 for Steady Simulation. When the residuals for all the variables drop by three orders or the maximum Number of Iterations reached, the calculation stops.

 

Transient Simulation Settings

In the Model Panel, deselect Flow and Turbulence model and select Particle Light and Particle Heavy check boxes. Click Transient radio button in the Simulation Panel. Define Simulation Time (Duration) to 1.5 s and Number of Time Steps to 750. Define Number of Iterations and Result Saving Frequency as 100. Click Load Results to load the steady state results before running the simulation. After you save the project, click Start to run the simulation. The result files are saved as .sres in the working folder (Example: "cyclone_separator_model_100.sres"). The number of result files depends on the Result Saving Frequency   Note: The result files are saved as .sres with the suffix of time steps in the working folder. The number of result files generated depend on the Result Saving Frequency.

Figure 11.19 - Transient simulation modules Figure 11.20 - Transient simulation

 

	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.
	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.