Create a flow convergence over the fluid domain subset

This example shows how to create a Flow Convergence simulation object that imposes the convergence of the following flow variables over a subset of the flow domain:

• U velocity, which converges when the following equation is satisfied: U velocity>12 m/s.

• Absolute pressure, which converges when its absolute difference, between two consecutive iterations, satisfies the following equation: |Pn+1-Pn|<0.2 MPa.In the equation:n is the iteration.P is the absolute pressure.

• Absolute temperature, which converges when its relative difference, between two consecutive iterations, satisfies the following equation: |(Tn+1-Tn)/Tn|<1%. In the equation, T is the absolute temperature.

1. Choose Home tab→Loads and Conditions group→Simulation Object Type list→Flow convergence .

2. From the type list, select Fluid Domain Subset.If you select the Whole Fluid Domain, you can track the flow convergence over the whole fluid domain, instead of a subset of the domain.

3. In the graphics window, select the region for which you want to track the flow convergence variables.Flow convergence applied on the subset of the fluid domain

4. In the Settings group, next to U Velocity, click Create Modeling Object .

5. In the Properties group, under Stopping Criteria, from the Criteria list, select Upper Limit.

6. Under the Averaging Method, from the Method list, select Volumetric Average Value.

7. Under the Magnitude, in the U Velocity box, enter 12 m/s.

8. Click OK.

9. In the Settings group, next to Absolute Pressure, click Create Modeling Object .

10. In the Properties group, under Stopping Criteria, from the Criteria list, select Absolute Difference.

11. Under the Averaging Method, from the Method list, select RMS.

12. Under the Magnitude, in the Absolute Pressure box, enter 0.2 MPa.

13. Click OK.

14. In the Settings group, next to Absolute Temperature, click Create Modeling Object .You can also track other flow convergence variables listed in the Settings group through their respective modeling objects. The flow solver stops the analysis when all the specified flow convergence variables reach their specified threshold values.

15. In the Properties group, under Stopping Criteria, from the Criteria list, select Relative Difference.

16. Under the Averaging Method, from the Method list, select Maximum Value.

17. Under the Magnitude, in the Absolute Temperature (%) box, type 1.

18. Click OK.

19. (Optional) To track the residual convergence of the flow parameters over the fluid domain during the solve, in the Convergence Options group, select the Output Residual Convergence check box.

20. Click OK.

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