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-   -   divergence detected in AMG solver: temperature (http://www.cfd-online.com/Forums/fluent/43503-divergence-detected-amg-solver-temperature.html)

zambroa January 27, 2007 15:17

divergence detected in AMG solver: temperature
 
i am simulating an ejector..in the initial part of the iteration..i get messages indicating reserved flow in 3 boundaries that i've set...the iteration stop when error occurs..the error says that divergence has been detected in AMG solver: temperature...can anyone tell me what that's mean...thank you

pinks January 30, 2007 00:52

Re: divergence detected in AMG solver: temperature
 
try to reduce URF of energy equations, say .9/.8. Use multigrid techniques/settings for initialisation and then start your run... Refer user guide for more details on multigrid settings.


bitak September 11, 2009 09:28

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.

Philipov September 11, 2009 09:32

Look at solver options.... V, W.... which parameter is on divergence...

bitak September 11, 2009 10:06

temprature become really more!!! or absolute pressure become really less!
after doing some changes in my solve at now iteration is really more (>90000)!!
how I can change my URF?
you think what I do?
my base solve is false?


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