# mesh independancy?

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 March 13, 2008, 07:40 mesh independancy? #1 amine Guest   Posts: n/a Hi, i've set a mesh which converged,but when refining the convergence was achieved ,is the problem a timescale kind or acually a mesh one. thanks

 March 13, 2008, 07:48 Re: mesh independancy? #2 matej Guest   Posts: n/a Dear amine, it is hard to understand what whould you like to know. both cases converged, so what is the problem? matej

 March 13, 2008, 08:22 Re: mesh independancy ? #3 amine Guest   Posts: n/a Hi, my question was, i set a mesh that converged,when refining that mesh the solution didn't converge at least after a large timestep iterations & ocilated which wasn't the case previously. thanks

 March 13, 2008, 14:36 Re: mesh independancy ? #4 Craig Hildreth Guest   Posts: n/a You are probably resolving details in the flow the prior mesh could not and these disturbances are affecting convergence.

 March 13, 2008, 17:42 Re: mesh independancy ? #5 Glenn Horrocks Guest   Posts: n/a Hi, Craig is correct. Try using a larger physical timescale. Glenn Horrocks

 March 13, 2008, 18:05 Re: mesh independancy ? #6 longbow Guest   Posts: n/a I don't see the logic behind increasing timescale whenever you see oscillation. What if that oscillation is a real physical phenomenon? Using large timescale to get rid of oscillation just for sake of getting converged result is not always a good practice.

 March 17, 2008, 17:41 Re: mesh independancy ? #7 Glenn Horrocks Guest   Posts: n/a Hi, I agree with you longbow. The full answer is work through the points on this link, of which increasing timescale is one: http://www.cfd-online.com/Wiki/Ansys...gence_criteria ps: I wrote this FAQ answer so I am well aware that there is more to it than just increasing the timestep! But I am a lazy typer so couldn't be bothered writing the whole thing every time somebody asks it. This question has been asked dozens of times so it gets pretty boring. Glenn Horrocks

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