Inflation Layers/thickness causing solution convergence problems

kd55 · November 13, 2012, 07:45

Hi There,

As the title suggests, I'm having problems with solver convergence in cfx. I have narrowed the problem down to:

- if i increase the no. of inflation layers beyond 7, the solution doesn't converge
- if i set the no. of layers to five, but decrease the total thickness below 1.4mm, the solution doesn't converge.

I am modeling a toy car within a wind tunnel using the sst turb. model.

Kind Regards,

Kit

ghorrocks · November 13, 2012, 21:26

This faq is relevant: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

But in your case it seems like you have a mesh quality issue.

November 13, 2012, 07:45	Inflation Layers/thickness causing solution convergence problems	#1
kd55 New Member Join Date: Nov 2011 Posts: 22 Rep Power: 15	Hi There, As the title suggests, I'm having problems with solver convergence in cfx. I have narrowed the problem down to: - if i increase the no. of inflation layers beyond 7, the solution doesn't converge - if i set the no. of layers to five, but decrease the total thickness below 1.4mm, the solution doesn't converge. I am modeling a toy car within a wind tunnel using the sst turb. model. Kind Regards, Kit

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November 13, 2012, 21:26		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	This faq is relevant: http://www.cfd-online.com/Wiki/Ansys...gence_criteria But in your case it seems like you have a mesh quality issue.