fem solvers
 

Hi!

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...

Re: fem solvers
 

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.

Re: fem solvers
 

please have a reference to the fidap users guide.