FEM fast iterative solvers

July 17, 2007, 14:44

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...

July 23, 2007, 00:39

You are sure that your system is symmetric positive definite?

July 17, 2007, 14:44	FEM fast iterative solvers	#1
dontknow Guest Posts: n/a	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...

July 23, 2007, 00:39	Re: FEM fast iterative solvers	#2
gdaymate Guest Posts: n/a	You are sure that your system is symmetric positive definite?

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