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-   -   Multigrid stability problem (http://www.cfd-online.com/Forums/main/15346-multigrid-stability-problem.html)

Vuik June 26, 2008 22:04

Multigrid stability problem
 
Hi all; I am solving a 3D Poisson Equation by linear multigrid method. It works fine when dx=dy=dz. But when the sizes of dx, dy or dz are not equal, I get instability problems. The Poisson solver convergce slowly ,or sometimes direvges. I have the same problem in 2D and also with FAS-Multigrid. Is it an usual case in Multigrid? I will be very pleased is somebody help me to fix this problem. Thanks in advance.



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