On 1/26/07, Berend van Wachem <berend at tfd.chalmers.se> wrote: > Multigrid is certainly possible (I would reccomend through HYPRE, > discussed on the mailinglist, although I still have problems with it), but > the question is how efficient it will be for your CFD problem.
>I doubt any "automatic" multigrid algorithm (in Hypre or > Petsc) would be able to capture this, but don't quote me on it - I am not > 100% sure. Indeed. In my recent experience trying to use BoomerAMG (with fully coupled, implicit FEM SUPG/PSPG formulation for incompressible NS eqs.), the results were quite disappointing. I am now trying to implement preconditioners based on approximate the Schur complement on the pressure. This decouples the full problem, but it need to solve an advection-diffusion-reaction problem and Poisson problems (such that multigrid can work well oin them) each time the preconditioner is applied. -- Lisandro Dalc?n --------------- Centro Internacional de M?todos Computacionales en Ingenier?a (CIMEC) Instituto de Desarrollo Tecnol?gico para la Industria Qu?mica (INTEC) Consejo Nacional de Investigaciones Cient?ficas y T?cnicas (CONICET) PTLC - G?emes 3450, (3000) Santa Fe, Argentina Tel/Fax: +54-(0)342-451.1594
