[petsc-users] unstructured finite volume method matrix assembly for partitioned mesh

[Matthew Knepley]

On Tue, Jan 17, 2012 at 12:26 PM, Rahul Praghanmor <praghanmor at gmail.com>wrote:

> Dear Sir,
>           I am working on a parallel unstructured finite volume solver.The
> solver is efficiently running in parallel using gauss seidel linear
> solver.The matrix is sparse and stored by CSR format.Now I want to
> implement a PETSc library to make the convergence faster.But I am going
> through a major problem as discussed below.
>           If I partitioned a big domain say rectangular duct into 4 zones
> using parMetis.Each zone is solved in separate processor as fairly solved
> by gauss seidel linear solver.But I want to solve these zones by PETSc.How
> to do that?How to form a matrix with global numbering which is required
> format for PETSc to form a matrix?Does it necessarily important to form a
> global matrix? very few information available for assembling a matrix from
> unstructured finite volume method in PETSc.
>

If you already run ParMetis, just number the rows it puts on each process
consecutively.

   Matt


> Thankx and regards,
> Rahul.
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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