3D LES - Error: Divergence detected in AMG solver

leonidassr · February 13, 2014, 12:54

I am working on a 3D LES and after almost 30 iterations I constantly have the continuity residual blowing up.
The message I get is: "Error: Divergence detected in AMG solver".

I was initially using a second order implicit scheme and relaxation factors of 10^(-6).
I tried switching to first order implicit and relaxation factors of 10^(-4), but still the same problem occurs.
Any ideas?

leonidassr · February 14, 2014, 05:50

I should also mention that my mesh is structured and that I am using periodic boundaries. By reading other threads I understand that this might also be a source of the problem.

February 13, 2014, 12:54	3D LES - Error: Divergence detected in AMG solver	#1
leonidassr New Member Leonidas Siozos-Rousoulis Join Date: Jan 2013 Location: Brussels, Belgium Posts: 11 Rep Power: 13	I am working on a 3D LES and after almost 30 iterations I constantly have the continuity residual blowing up. The message I get is: "Error: Divergence detected in AMG solver". I was initially using a second order implicit scheme and relaxation factors of 10^(-6). I tried switching to first order implicit and relaxation factors of 10^(-4), but still the same problem occurs. Any ideas?

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February 14, 2014, 05:50		#2
leonidassr New Member Leonidas Siozos-Rousoulis Join Date: Jan 2013 Location: Brussels, Belgium Posts: 11 Rep Power: 13	I should also mention that my mesh is structured and that I am using periodic boundaries. By reading other threads I understand that this might also be a source of the problem.