# Reason of divergence ?

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 November 29, 2000, 00:51 Reason of divergence ? #1 Brayton Guest   Posts: n/a Hi, I am writing a finite volume code. But I met a problem. When using finer grids, the computation becomes divergent! What is the reason ? Thank in advance.

 November 29, 2000, 02:05 Re: Reason of divergence ? #2 Mukhopadhyay Guest   Posts: n/a Please refer to the thread 'convergence problem' in this forum posted by 19/20 Nov. Also look for the archive. If there is any specific topic please leave message for discussion.

 November 29, 2000, 14:34 Re: Reason of divergence ? #3 frederic felten Guest   Posts: n/a hi there, What kind of grid arrangement are you using? Staggered or Collocated? If you are using a collocated arrangement, well be sure that you're treating correctly the pressure-velocity coupling.You also need to pay special attention to the velocity correction. Check the following article: Morinishi, Lund, Vasilyev and Moin. "Fully Conservative Higher Order Finite Difference Schemes for Incompressible Flow". J. Comp. Phys 143, 90-124, 1998. Can be downloaded at: http://mae.uta.edu/~lund/ Finally be sure that your time step does verify the CFL condition. I hope this helps, Sincerely, Frederic Felten CFD Laboratory, UT Arlington. http://utacfdb.uta.edu/

 December 2, 2000, 23:34 Re: Reason of divergence ? #4 Brayton Guest   Posts: n/a Thank you all!

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