> On Sep 20, 2019, at 12:35 AM, Young Hyun Jo wrote:
>
> Thanks for the answer.
> It's really helpful to understand the PETSc library.
> By the way, I just want to ask two more questions not related to the
> multigrid.
>
> 1. Is there a method known as the fastest solver for Poisson's equatio
The DMDA structured grid management in PETSc does not provide the needed
interpolations for doing non-nested multigrid. The algebraic portions of
PETSc's geometric multigrid would work fine for that case if you have your own
way to provide the needed interpolation. I'll note that mathematica
You didn't indicate "why" you can't use multiple levels with "130 grids", is
there some error message? Nor do you mention if you have periodic boundary
conditions or are using cell or vertex centered unknowns. All of these things
affect when you can coarsen for multigrain or not.
Conside
