Dear Shaman, As far as I could understand, there is a BoomerAMG?s systems AMG version available. This seems to be exactly what I am looking for, but I just don't know how to access it, either through PETSc or directly.
Best regards, Nicolas > Hi, > > You want to exploit the structure of the model? > As far as I know, boomeramg can not treat a set of rows or blocks as > a molecule, a so called block-smoother? > ML 2.0 smoothed aggregation does support it. > > With best regards, Shaman Mahmoudi > > On Apr 13, 2007, at 10:45 AM, Nicolas Bathfield wrote: > >> Hi, >> >> I am solving the Navier-stokes equations and try to use Hypre as >> preconditioner. >> Until now, I used PETSc as non-segregated solver and it worked >> perfectly. >> Things got worse when I decided to use Boomeramg (Hypre). >> As I solve a system of PDEs, each cell is represented by 5 rows in my >> matrix (I solve for 5 variables). PETSc handles that without problem >> apparently, but the coarsening scheme of Boomeramg needs more input in >> order to work properly. >> >> Is there an option in PETSc to tell HYPRE that we are dealing with a >> system of PDEs? (something like: -pc_hypre_boomeramg_...) >> >> >> Thanks for your help. >> >> Best regards, >> >> Nicolas >> >> >> -- >> Nicolas BATHFIELD >> Chalmers University of Technology >> Shipping and Marine Technology >> phone: +46 (0)31 772 1476 >> fax: +46 (0)31 772 3699 >> > > -- Nicolas BATHFIELD Chalmers University of Technology Shipping and Marine Technology phone: +46 (0)31 772 1476 fax: +46 (0)31 772 3699
