AMG Solver
 

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?

Re: AMG Solver
 

Try reducing the under relaxation factor for energy in the solution control panel and run the iteration.

Re: AMG Solver
 

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.

Re: AMG Solver
 

hi aother reason for AMG is for high Dense messing and also increase the temperature limits in define operating condition

Re: AMG Solver
 

Dear Hari, Podila and Manoj Kumar thank you very much for sharing your opinion and guidence..

AMG Solver
 

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