[petsc-dev] Setup subsnes in nasm.c

[Lulu Liu]

On Fri, May 27, 2016 at 5:50 PM, Matthew Knepley <knepley at gmail.com> wrote:

> 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.
>


Does the current interface (nasm.c) work for unstructured grids?



>
>   Thanks,
>
>      Matt
>
>
>> PetscErrorCode SNESNASMSetSubdomains_NASM(SNES snes,PetscInt n,SNES
>> subsnes[],VecScatter iscatter[],VecScatter oscatter[],VecScatter gscatter[])
>>
>>
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>
>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>

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