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-   -   HELP!a problem when starting the unsteady iteration in Fluent (http://www.cfd-online.com/Forums/fluent/71905-help-problem-when-starting-unsteady-iteration-fluent.html)

usst139 January 19, 2010 09:56

HELP!a problem when starting the unsteady iteration in Fluent
 
I have a problem when starting the unsteady iteration in Fluent,and it said——"warning:non-positive volumes exist.
Error:divergence detected in AMG solver :pressure correction
Error object:()

I guess something wrong with my original grid in Gambit?
hELP ME!THANK YOU!

radix January 20, 2010 13:41

You might to reconsider your meshing result from GAMBIT. Check your mesh result. Have a look on your right corner of your GAMBIT window to this. The 'non-positive volume' exist due to the highly-generated skewness.
As for the divergence problem,you can prevent this by setting your 'under-relaxation factor'. Make it smaller.
Hope this short reply would solve your problems.

Regards,
Raditya

usst139 January 21, 2010 02:37

Thank you for your kind advice,Raditya:)
Yes,the blade in my model has a very high skewness,so I 'm trying to use the Boundary Layer or Sizefunction to make a better mesh:)


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