Re: HYPRE with multiple variables

[Shaman Mahmoudi <shma7099@xxxxxxxxxxxxx>]

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