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-   -   " Divergence detected in AMG solver: temperature" (http://www.cfd-online.com/Forums/fluent/43957-divergence-detected-amg-solver-temperature.html)

Suman March 1, 2007 17:15

" Divergence detected in AMG solver: temperature"
 
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

Le March 2, 2007 02:36

Re: " Divergence detected in AMG solver: temperatu
 
You must adjust the relaxation factors and numerical method correctly. It depends on specific cases. Please try it again

Suman March 2, 2007 09:10

Re: " Divergence detected in AMG solver: temperatu
 
Thanks Le,

changing the URFs seems to work.

Thanks again,

Suman

ravi March 12, 2007 02:06

Re: " Divergence detected in AMG solver: temperatu
 
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 09:31

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.


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