convergence, numeca

October 1, 2007, 08:48

What should we do if 2 out of 10 CFD models do not converge? We need to compare CFD results amongst all 10 cases but 2 of them not converged. If we change under-relaxation factors for 2 of these, will our comparison be valid? What do people normally do when encounter this problem?

July 9, 2008, 04:34

Hamidzoka · March 13, 2010, 01:51

Dear rsi;
if this problem is fixed by changing the relaxation factors, your comparison is valid. relaxation factors does not affect the converged results. they only adjust the convergence rate. under relaxation factors are just useful tools to help the convergency.
does it help?

regards

October 1, 2007, 08:48	convergence, numeca	#1
rsi Guest Posts: n/a	What should we do if 2 out of 10 CFD models do not converge? We need to compare CFD results amongst all 10 cases but 2 of them not converged. If we change under-relaxation factors for 2 of these, will our comparison be valid? What do people normally do when encounter this problem?

July 9, 2008, 04:34	Re: convergence, numeca NM	#2
Srinu Guest Posts: n/a

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March 13, 2010, 01:51		#3
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 Rep Power: 19	Dear rsi; if this problem is fixed by changing the relaxation factors, your comparison is valid. relaxation factors does not affect the converged results. they only adjust the convergence rate. under relaxation factors are just useful tools to help the convergency. does it help? regards