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-   -   HELP! divergence detected in AMG solver (http://www.cfd-online.com/Forums/fluent/30740-help-divergence-detected-amg-solver.html)

ann January 1, 2003 22:20

HELP! divergence detected in AMG solver
 
I'm calculating a stage of axial compressor, but when I began iterating, it will appear such error:

Error: divergence detected in AMG solver: pressure correction

Error Object: ().

I have tried to reduce the under-relaxation factors of pressure and it's useful in some cases. Later, I increase the grid number and I also adopt the above measures, after about 2000 iteration the above error appeared again.

Could anyone tell me how I should do and what I should do?

Thanks for any help!

regards ann


zhhuang January 2, 2003 21:10

Re: HELP! divergence detected in AMG solver
 
ann check your B.C first!And the initial condition is also important .

ann January 3, 2003 05:01

Re: HELP! divergence detected in AMG solver
 
zhhuang,thanks for your response!

My calculating case is obtained from NACA report. The inlet B.C. is inlet total pressure(about 67,000),inlet total temperature (300k) ,inlet initial gauge pressure ( 65000) and hydraulic diameter 0.0502meter(the pitch). The outlet B.C. is 74000.

Any problems do you think?

Thanks in advance!

Regards, ann


zhhuang January 4, 2003 02:27

Re: HELP! divergence detected in AMG solver
 
ann, I think you can use the 1st order method firstly then use the 2nd order ,this maybe can help you! zhhuang


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