[petsc-users] SNESFAS for an unstructured mesh

Khai Pham khaipham at utexas.edu
Wed Jun 29 13:47:57 CDT 2016

Hi Vijay,

Thanks for your response. Is DMMoad is other special kind of data structure
in Petsc? I'd like to use the petsc FAS for the finite element code in our
group and all the data structure for mesh topology is all set. Thus I try
to avoid all petsc data structure. As far as I know the FAS will construct
the coarse solution based on DM for structured grid and DMPlex for
unstructured grid as in ex12. Would it be possible to use FAS without using
petsc DM/DMPlex by adding extra code? How much effort would you estimate?
Thanks !

On Wed, Jun 29, 2016 at 12:14 PM, Vijay S. Mahadevan <vijay.m at gmail.com>

> Khai,
> There is DMMoab in PETSc that can handle unstructured meshes and I am
> currently refining and preparing a PR to PETSc that includes features
> to support geometric multigrid. I do not have an example yet to use
> FAS as a solver but can create one for an unstructured grid. Are there
> any particular features that you are looking for in the example ? Why
> is DMPlex not an option for you ?
> Vijay
> On Wed, Jun 29, 2016 at 9:59 AM, Khai Pham <khaipham at utexas.edu> wrote:
> > Hi Petsc-users,
> >
> > I'm looking for the use of nonlinear multigrid method (FAS). I'm
> wondering
> > if someone could point me to an example of using FAS for an unstructured
> > mesh without using DMPlex in petsc. Thanks !
> >
> > Khai
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