[petsc-users] Coupling HYPRE with PETSc for local grid refinement

[Jed Brown]

On Sun, Oct 7, 2012 at 11:59 AM, Alan <zhenglun.wei at gmail.com> wrote:

>  Dear Dr. Brown,
>     I was trying to use PETSc to mimic something like Chombo. The figure
> in this website represents my thought very well.  (
> https://commons.lbl.gov/display/chombo/Chombo+-+Software+for+Adaptive+Solutions+of+Partial+Differential+Equations).
> My code simulates a flow over a objective, i.e. 2D cylinder. Finer
> resolution is needed near the objective. I can manually define where the
> finer resolution is needed.
>

You could just use Chombo... It's a lot of work to write a good
implementation of dynamic AMR. We don't have a fully worked example of
doing that, but there are plenty of packages that do AMR and use PETSc.


>     BTW, I wonder if there is any examples for the Vec/Mat interface.
>

See src/mat/examples/tutorials, or any of the higher level interfaces. Look
at the user's manual.


> Also, is there any examples for PETSc for GPU.
>

http://www.mcs.anl.gov/petsc/features/gpus.html


>
> thanks,
> Alan
>
> On Sat, Oct 6, 2012 at 10:47 PM, Alan <zhenglun.wei at gmail.com> wrote:
>
>>  Dear Dr. Brown,
>>      Thanks for your reply and sorry for confusing you.
>>      I was trying to ask if there is an alternative way that I can
>> replace the DMDACreate3d in /src/ksp/ksp/example/tutorials/ex45.c with
>> something from outside of the PETSc (i.e. HYPRE). DMDACreate3d generates a
>> 3D Cartesian grid with uniform grid size. However, I'm trying to import a
>> local refined grid from outside of the PETSc (i.e. HYPRE) to replace this
>> 3D Cartesian grid with unifrom grid size. Is there any examples for me to
>> refer?
>>
>
>  Do we have automatic support for this? No. You could of course just use
> the Vec/Mat interface, but
>  it sounds like a lot of coding on your part. I plan to do this eventually
> by specifying the data layout over
> the grid using PetscSection. However, the really important question here
> is, what do you need from the
> grid? If you don't need topological queries, just make the Vec/Mat and be
> done with it. If you do (which
> I imagine), then you need to be specific about what you need.
>
>     Matt
>
>
>>  thanks,
>> Alan
>>
>>  Run any example with -pc_type hypre. I'm not sure what you're asking
>> for.
>>
>> On Sat, Oct 6, 2012 at 8:04 PM, Alan <zhenglun.wei at gmail.com> wrote:
>>
>>> Dear Folks,
>>> I hope you're having a nice day.
>>> I'm trying to couple HYPRE with PETSc in order to use PETSc solvers to
>>> obtain solutions (Poisson Equation) with local refined grid from HYPRE.
>>> Is there any examples in PETSc that I can refer? or is there any
>>> examples in PETSc which introduce such a way that the Matrix is imported
>>> from external software rather than generated by PETSc.
>>>
>>> thanks,
>>> Alan
>>>
>>>
>>
>>
>
>
>  --
> 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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