> On Mar 11, 2019, at 9:42 AM, Pietro Benedusi via petsc-users
> wrote:
>
> Dear Petsc team,
>
> I have a question about the setting up of a multigrid solver.
>
> I would like yo use a PCG smoother, preconditioned with a mass matrix, just
> on the fine level.
> But when add the line for
You are giving all levels the same matrices (K & M). This code should not
work.
You are using LU as the smother. This will solve the problem immediately.
If MG is setup correctly then you will just have zero residuals and
corrections for the rest of the solve. And you set the relative tolerance
Dear Petsc team,
I have a question about the setting up of a multigrid solver.
I would like yo use a PCG smoother, preconditioned with a mass matrix, just on
the fine level.
But when add the line for preconditioning the CG with the mass matrix my MG
diverges.
I have implemented the same
