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FEM fast iterative solvers

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Old   July 17, 2007, 13:44
Default FEM fast iterative solvers
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dontknow
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Hi everybody,

I am developing a fem-code and I get problems when solving big systems. I use cgstab type algorithms and I think I have to use better preconditioners. Has anybody good references or experience with cgstab-algorithms for FEM. I also tried to use a AMG-solver but it also is very slow. I think I have to treat the u,v,w-displacements in different a more sophisticated way I do. Has anybody also for this problem (AMG for FEM) good references?

Thank you very much...
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Old   July 22, 2007, 23:39
Default Re: FEM fast iterative solvers
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gdaymate
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You are sure that your system is symmetric positive definite?
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