Grid convergence

MissCFD · August 24, 2016, 12:19

Is it fair to limite the residual level, for exemple RMS 10^-5, and to limite the minimun number of iteration too when we do a grid convergence ? This is required for the stabilite of certain quantities of interest when the residual level doesn't really drop. However, the simulations are stopped at different residual levels, so I wonder if I can compare the results following this methodology ?

Or, should I do the grid convergence with only the residual level as stop criteria, compare the results although not all quantities of interest aren't stable. And only then, to vary the minimum number of iteration ?

Thank you for your help !

ghorrocks · August 24, 2016, 20:03

If you can see the results are converged with the parameters of interest to you then I would accept looser residuals convergence.

August 24, 2016, 12:19	Grid convergence	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Is it fair to limite the residual level, for exemple RMS 10^-5, and to limite the minimun number of iteration too when we do a grid convergence ? This is required for the stabilite of certain quantities of interest when the residual level doesn't really drop. However, the simulations are stopped at different residual levels, so I wonder if I can compare the results following this methodology ? Or, should I do the grid convergence with only the residual level as stop criteria, compare the results although not all quantities of interest aren't stable. And only then, to vary the minimum number of iteration ? Thank you for your help !

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August 24, 2016, 20:03		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	If you can see the results are converged with the parameters of interest to you then I would accept looser residuals convergence.