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Reason of divergence ?

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Old   November 28, 2000, 23:51
Default Reason of divergence ?
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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.

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Old   November 29, 2000, 01:05
Default Re: Reason of divergence ?
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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.
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Old   November 29, 2000, 13:34
Default Re: Reason of divergence ?
frederic felten
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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: Finally be sure that your time step does verify the CFL condition.

I hope this helps,


Frederic Felten CFD Laboratory, UT Arlington.
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Old   December 2, 2000, 22:34
Default Re: Reason of divergence ?
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Thank you all!
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