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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[blockMesh] mesh causing problems with convergence	Tetragramm	OpenFOAM Meshing & Mesh Conversion	0	September 22, 2012 17:00
simpleFoam convergence problems for pipe flow problem	Mike Graham	OpenFOAM Running, Solving & CFD	0	January 30, 2012 15:40
Solution convergence problem - poor mesh?	Shawn_A	OpenFOAM Running, Solving & CFD	2	November 12, 2011 20:31
General Unsteady solution convergence	Freeman	Main CFD Forum	0	December 7, 2005 18:08
convergence problems	david aquilina	Siemens	4	October 27, 2000 10:18

November 13, 2012, 21:26		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 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.