[petsc-users] Solving problem using multigrid

[Mark Adams]

The manual is pretty clear on this, but your code is purely algebraic, that
is you do not use a DM, and so you will need to use algebraic multigrid
(AMG). So you want to look at AMG preconditioners (-pc_type gamg [or hypre
if you configured with --download-hypre]).

Mark

On Sun, Nov 18, 2018 at 1:28 PM Fazlul Huq via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello PETSc developers,
>
> I have solved a problem using ksp. Please find the problem in attachment 1
> and PETSc code for solution in attachment 2.
> Now I need to solve the same problem using multigrid.
> I never solved problem using multigrid. Can you please guide me about
> steps that I should follow
> to solve this problem using multigrid.
>
> Thanks.
> Sincerely,
> Huq
> --
>
> Fazlul Huq
> Graduate Research Assistant
> Department of Nuclear, Plasma & Radiological Engineering (NPRE)
> University of Illinois at Urbana-Champaign (UIUC)
> E-mail: huq2090 at gmail.com
>
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