"divergence detected in AMG solver" due to grid issues

aerknight · September 22, 2010, 08:36

I have a problem where Fluent will not start a case and immediately outputs "divergence detected in AMG solver"

I have narrowed the problem to very small cells in a certain region of my grid. I have a consistantly refined mesh and do not see these problems on coarser grids.

Furthermore, I see this problem when using the Spalart-Allmaras turbulence model, but not some of the other turbulence models. My project is the validation the S-A model, so it is essential that I use it.

Thanks for your time.

pranab_jha · September 23, 2010, 19:01

This question has been answered a couple of times now I think. Do a search and you will get it.

September 22, 2010, 08:36	"divergence detected in AMG solver" due to grid issues	#1
aerknight New Member Kyle Join Date: Sep 2010 Posts: 1 Rep Power: 0	I have a problem where Fluent will not start a case and immediately outputs "divergence detected in AMG solver" I have narrowed the problem to very small cells in a certain region of my grid. I have a consistantly refined mesh and do not see these problems on coarser grids. Furthermore, I see this problem when using the Spalart-Allmaras turbulence model, but not some of the other turbulence models. My project is the validation the S-A model, so it is essential that I use it. Thanks for your time.

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September 23, 2010, 19:01		#2
pranab_jha Member Pranab N Jha Join Date: Nov 2009 Location: Houston, TX Posts: 86 Rep Power: 16	This question has been answered a couple of times now I think. Do a search and you will get it.