too bad convergence
Hi everybody, I'm in trouble with a finite difference code to resolve a Poisson equation in a channel.
I have a 3D problem with Neumann condition in one direction and the others are periodic. In regular mesh, it works perfectly but as soon as I use an stretched mesh ( even very very smooth ), my SOR ( or other relaxtion method ) converge on large residual ( about 0.1 ). I have no idea how to get a good convergence. Thanks for your help. 
Re: too bad convergence

Re: too bad convergence
Thanks for your response, I've already seen it but it doesn't correspond to my problem. In my case, Pressure equation is inviscid, and it doesn't converge ( nor diverge )even for very smooth stretch.

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