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HELP! divergence detected in AMG solver

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Old   January 1, 2003, 22:20
Default HELP! divergence detected in AMG solver
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ann
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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

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Old   January 2, 2003, 21:10
Default Re: HELP! divergence detected in AMG solver
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zhhuang
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ann check your B.C first!And the initial condition is also important .
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Old   January 3, 2003, 05:01
Default Re: HELP! divergence detected in AMG solver
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ann
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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

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Old   January 4, 2003, 02:27
Default Re: HELP! divergence detected in AMG solver
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zhhuang
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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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