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Old   February 11, 2006, 07:53
Default Dynamic mesh
  #1
Giuseppe
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Hello to all,

I have a problem: I'm using the dynamic mesh technique with a profile; when I say to Fluent to iterate, the following message appears me:

WARNING: non-positive volumes exist. Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: ()

what means? someone can help me? Thanks
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Old   February 11, 2006, 08:12
Default Re: Dynamic mesh
  #2
Alan
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How did you generate your mesh?

Did you use Gambit? or a third party mesher?
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Old   February 11, 2006, 08:19
Default Re: Dynamic mesh
  #3
Luca
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Ciao Giuseppe, are you running an unsteady analysis, right? Unfortuantely Fluent dynamic mesh algorithm is not very robust. Try lowering time-step and raising spring-iteration. Luca
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Old   February 11, 2006, 09:30
Default Re: Dynamic mesh
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Giuseppe
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To Alan,

I have generate a quad map grid with Gambit.

Thanks for reply
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Old   February 11, 2006, 10:17
Default Re: Dynamic mesh
  #5
Javier
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Amico Giuseppe, Did you get it to work? I've run into that problem too. I know it's painful. What I found is that you need to move the boundary in steps that are shorter than the distance between 2 nodes, try half of the distance between 2 nodes. Let me know what you found. Ciao ragazzo Javier
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