CFX solver Convegence Problem

wangy1767 · July 2, 2012, 06:39

Dear all,

I set the Residual Target of RMS is 1.0e-4. However, after the certain iterations, it is found only RMS P-Mass gets to 1.0e-5, others e.g. RMS U/V/W etc. only get to 1.0e-3. Could we think this simulation is converging? If not, how can we think it converges for the RMS? And how to make it converge? Since I tried to make the CFD simulation to meet the actual situations many times. But it still cannot meet 1.0e-4 for all the final iterations.

Please give me some advices and solutions for that.

Many thanks in advance!

lffabiani · July 2, 2012, 07:51

Yang,

Take a look at the FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

The first item is just about this topic.

And to answer your question, it appears that your solution has not converged.

Best regards

July 2, 2012, 06:39	CFX solver Convegence Problem	#1
wangy1767 Member yang Join Date: Jun 2012 Posts: 39 Rep Power: 13	Dear all, I set the Residual Target of RMS is 1.0e-4. However, after the certain iterations, it is found only RMS P-Mass gets to 1.0e-5, others e.g. RMS U/V/W etc. only get to 1.0e-3. Could we think this simulation is converging? If not, how can we think it converges for the RMS? And how to make it converge? Since I tried to make the CFD simulation to meet the actual situations many times. But it still cannot meet 1.0e-4 for all the final iterations. Please give me some advices and solutions for that. Many thanks in advance!

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July 2, 2012, 07:51		#2
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	Yang, Take a look at the FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria The first item is just about this topic. And to answer your question, it appears that your solution has not converged. Best regards