[petsc-dev] Setup subsnes in nasm.c

[Matthew Knepley]

On Fri, May 27, 2016 at 10:39 AM, Lulu Liu <lulu.liu at kaust.edu.sa> wrote:

>
> I am trying to solve a nonlinear problem using NASM, and see the code in
>  petsc/src/snes/impls/nasm/nasm.c. However, I feel confused about how
> subsnes for each subdomain gets its own function, and I can not find
> anything like SNESSetFunction(subsnes,......). Could you show me which line
> subsnes gets its own function in nasm.c?
>

The function is coming from the DM. The subDMs get the same SNESDM
structures as the original DM, and then
SNESSetDM() is called on them.


> In addition, I would like to set up something using
> SNESNASMSetSubdomains_NASM (). Is there any example showing how to set
> subsnes, iscatter, oscatter,gscatter? Thanks!
>

Unfortunately there are no examples. I am not a big fan of this interface
which is only really intelligible for Cartesian grids.
I am going to try and rework it this fall.

  Thanks,

     Matt


> PetscErrorCode SNESNASMSetSubdomains_NASM(SNES snes,PetscInt n,SNES
> subsnes[],VecScatter iscatter[],VecScatter oscatter[],VecScatter gscatter[])
>
>
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