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Old   June 20, 2007, 16:55
Default fem solvers
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Which solvers are the best for FEM-calculation! Many times I read that direct solution algorithm (based on gaussian elimination) are yet used! Aren't they very bad for solving the sparse equation systems, whats about cgstab-type algorithms, I think they should be much faster and much less expensive in storage cost?!?!

Thank you very much...
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Old   June 21, 2007, 03:43
Default Re: fem solvers
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CGstab is for symmetric positive definite matrices only if I remember correctly. But you're right. Direct solvers are only for toy examples. In real life usually Krylov subspace methods (eg. CG, BiCGStab, MINRES, GMRES) with preconditioners and/or Multigrid solvers are used.
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Old   June 24, 2007, 12:51
Default Re: fem solvers
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please have a reference to the fidap users guide.

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