" Divergence detected in AMG solver: temperature"

March 1, 2007, 17:15

Hi,

I am trying to run a 3D case but each time it diverges. I started with a Laminar - Segregated - Steady case with heat transfer.

As that diverged I tried changing Relaxation parameters but that was of no use. I tried unsteady with a 10^-4 timestep. Within 2 time steps it diverged. I even went ahead and saw if it works without without heat transfer, still it diverges.

The error message I get is....>>

" Divergence detected in AMG solver: temperature"

Please Help!

Thanks in advance,

Suman

March 2, 2007, 02:36

You must adjust the relaxation factors and numerical method correctly. It depends on specific cases. Please try it again

March 2, 2007, 09:10

Thanks Le,

changing the URFs seems to work.

Thanks again,

Suman

March 12, 2007, 02:06

hi...

this is just my experiance.. try 2 change the temp.. limits in the control panel.. may be high temp.. is there in ur problem..if not try with diff.. discretization methods for temp . just try

bitak · September 11, 2009, 10:31

Hi.
I work on project about subsonic ejector like you.
My solve is :air - couple - axisymetric - k-e rng - pressure inlet and outlet ideal gas - my presure inlet are 150 ,250 ,350 ,450 Kpa and out let is atmosphere.
unfortunately my solve is divergence!!!!!!!!!
really I need to your help.
I change k-e to k-omega and pressure inlet to mass flow but devegence again.I know i have a shoke and so reverse flow in fluent.

March 1, 2007, 17:15	" Divergence detected in AMG solver: temperature"	#1
Suman Guest Posts: n/a	Hi, I am trying to run a 3D case but each time it diverges. I started with a Laminar - Segregated - Steady case with heat transfer. As that diverged I tried changing Relaxation parameters but that was of no use. I tried unsteady with a 10^-4 timestep. Within 2 time steps it diverged. I even went ahead and saw if it works without without heat transfer, still it diverges. The error message I get is....>> " Divergence detected in AMG solver: temperature" Please Help! Thanks in advance, Suman

March 2, 2007, 02:36	Re: " Divergence detected in AMG solver: temperatu	#2
Le Guest Posts: n/a	You must adjust the relaxation factors and numerical method correctly. It depends on specific cases. Please try it again

March 2, 2007, 09:10	Re: " Divergence detected in AMG solver: temperatu	#3
Suman Guest Posts: n/a	Thanks Le, changing the URFs seems to work. Thanks again, Suman

March 12, 2007, 02:06	Re: " Divergence detected in AMG solver: temperatu	#4
ravi Guest Posts: n/a	hi... this is just my experiance.. try 2 change the temp.. limits in the control panel.. may be high temp.. is there in ur problem..if not try with diff.. discretization methods for temp . just try

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September 11, 2009, 10:31		#5
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 17	Hi. I work on project about subsonic ejector like you. My solve is :air - couple - axisymetric - k-e rng - pressure inlet and outlet ideal gas - my presure inlet are 150 ,250 ,350 ,450 Kpa and out let is atmosphere. unfortunately my solve is divergence!!!!!!!!! really I need to your help. I change k-e to k-omega and pressure inlet to mass flow but devegence again.I know i have a shoke and so reverse flow in fluent.