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Old   July 6, 2004, 17:21
Default Error message while iterating
  #1
John
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Hi everyone,

In the first few iterations I get the following error message:

Error: divergence detected in AMG solver: pressure correction Error Object: ()

I run an axi-symmetric model of pipe with an orifice plate and use k-omega turbulence model.

I've checked that I don't have any negetive volumes, if anyone know what seems to be the problem I'll be thankful to him.

Thanks in advance, John

BTW: Running the problem on laminar viscous model before k-omega is not an option due to insufficient model size for the development of separation bubble.
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Old   July 6, 2004, 17:44
Default Re: Error message while iterating
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rosco
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Symmetry axis must be x , if not there's an error.
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Old   July 7, 2004, 02:18
Default Re: Error message while iterating
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John
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It is.... this is not the problem
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Old   July 7, 2004, 13:10
Default Re: Error message while iterating
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Zhihua
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Try lower under-relaxation factor for pressure.
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Old   July 7, 2004, 13:15
Default Re: Error message while iterating
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Krishna Podila
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check on mutligrid options may be u can lower the underelaxation factor for pressure as suggested by some but I am sure that will not help to an extent. may be u can try to check inintal boundary conditions and reduce the number of cells by making it coarser. bye
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Old   July 12, 2004, 13:36
Default Re: Error message while iterating
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Ryan Zarnitz
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Try going to Solve --> controls and change Max. Coarse Levels to 0. Solve a few iterations and then restore the default (20).
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