[petsc-users] Get stiffness matrix by using Petsc's functions

[Tsung-Hsing Chen]

I'll check them out.

Thanks,
Tsung-Hsing Chen

Matthew Knepley <knepley at gmail.com> 於 2019年7月23日 週二 下午8:54寫道：

> On Tue, Jul 23, 2019 at 2:45 AM Tsung-Hsing Chen via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
>> Hi,
>> I'am using Petsc to solve FEM problems.
>> Right now I just use MatSetValue() or MatSetValues() to build up the
>> stiffness matrix.
>> I wonder can I easily get stiffness matrix by using Petsc's functions.
>> By the way, I'am using unstructured grid (DMPlex).
>>
>
> PETSc has some support to generate very simple FEM problems. Almost
> everything we can do is shown
> in examples. For instance,
>
>   SNES ex12: Poisson
>   SNES ex17: Elasticity
>   SNES ex62: Stokes
>   SNES ex69: nonlinear Stokes
>   SNES ex77: large deformation Elasticity
>   TS      ex45: Heat equation
>   TS      ex46: Navier-Stokes
>
> If those look understandable, then maybe this system is capable of
> generating your problem.
>
>   Thanks,
>
>      Matt
>
> Thanks a lot for your help,
>> Tsung-Hsing Chen
>>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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