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Old   January 22, 2008, 20:13
Default Turbomachinery analysis time
  #1
SH.LEE
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Hi, i'm analysis turbomachinery that air compressor its rpm is 120,000 and flow rate is 0.06kg/s i iterate over 500 but it's not converged, and risiduals oscillation

what is the problem in my case? plz advise me...
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Old   January 22, 2008, 20:35
Default Re: Turbomachinery analysis time
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Usman
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I think you will have to run unsteady case for your problem. Thats what oscillation of residuals indicate.

Usman
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Old   January 23, 2008, 05:57
Default Re: Turbomachinery analysis time
  #3
SH.LEE
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Thx Usman.

i think that if i do unsteady simulation this case it will be take very long time becasuse it's rpm is over 120,000rpm so time step will be very small for corant number.
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Old   January 24, 2008, 01:00
Default Re: Turbomachinery analysis time
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Jack
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Well, pls tell me your geometry of your compressor, I think you are running at a point well beyond surge point. Looks like you are working on a project very similar to mine. MInd to tell me about you and your work? Thanks
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Old   January 24, 2008, 17:39
Default Re: Turbomachinery analysis time
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Glenn Horrocks
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Hi,

This question has been asked hundreds of times before. Look at the FAQ:

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Glenn Horrocks
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Old   January 28, 2008, 00:53
Default Re: Turbomachinery analysis time
  #6
SH.LEE
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Thx Glenn.

and I will more carefull before wirete question...
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