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 >
