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Old   September 19, 2005, 08:44
Default AMG Solver
  #1
Seyfettin
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I am studying on a 3D jet in crossflow. after some iteration I have got the "Divergence detected in AMG Solver:TEMPERATURE" and then the iteration stop.

Do you know why it could be?
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Old   September 19, 2005, 09:59
Default Re: AMG Solver
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hari
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Try reducing the under relaxation factor for energy in the solution control panel and run the iteration.
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Old   September 19, 2005, 15:01
Default Re: AMG Solver
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Podila
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AMG solver divergence is detected due to the following reasons:

1.> If u are making use of UDM's in UDF and not allocated memory for the problem setup then u will land up with this error message

2.> Due to the underelaxation parameter beign too stringent as some one earlier pointed out

3.>It also comes up if u have closure terms not properly formulated. what momentum interaction terms are you using?

I hope this atleat provides some info. to start with.
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Old   September 21, 2005, 03:43
Default Re: AMG Solver
  #4
MANOJ KUMAR
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hi aother reason for AMG is for high Dense messing and also increase the temperature limits in define operating condition
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Old   September 22, 2005, 04:17
Default Re: AMG Solver
  #5
Seyfettin
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Dear Hari, Podila and Manoj Kumar thank you very much for sharing your opinion and guidence..
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Old   October 1, 2005, 12:13
Default AMG Solver
  #6
Sachin Nimbalkar
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Hello all,

I am working on 3D, ROTATING/ SWIRL flow inside the pipe problem. Flow is compressible and turbulent. I started with Segregated and Implicit solver with under-relaxation factor for energy equation equal to 1. I am using RSM as a turbulence model.

But after some iteration I have got the "Divergence detected in AMG Solver:TEMPERATURE" and then the iteration stop.

Please help.

Thanks in advance,

best wishes,

Sachin Nimbalkar

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