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Convergence of Continuity

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Old   February 28, 2009, 17:03
Default Convergence of Continuity
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Dodi
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Hi everyone!

I'm trying to model 3D flow with a sudden contraction. Initailly I kept on getting error messages "Error: divergence detected in AMG solver: pressure correction" but after making my structured grid more uniform the problem dissapeared, however therefore the continuity residual doesn't want to converge below 3.6 e-10 (the other residuals are doing fine). It seems that increasing the mesh density lowers the value where the continuity flattens off but I cant go any denser anymore as otherwise I'll get a too small Y+ value (am using the standard wall function). Here's a list of things that I already tried to do: - change pressure-velocity coupling to coupled & simplec - lowering the under relaxation factors - changing the discretisation to 2nd order schemes

Non of these steps however lowered my continuity residual - does anyone have an idea why that is?? Or what I can do?

Thanks for any help! Dorit
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