[petsc-users] Example for unstructured grid, metis, petsc

[Matthew Knepley]

On Mon, Aug 22, 2016 at 9:19 AM, Mohammad Mirzadeh <mirzadeh at gmail.com>
wrote:

> Matt,
>
>
>> Yes. It is working on SNES ex12, ex62, and TS ex11. We have some more
>> work to do testing adaptivity, but simple
>> gradient indicators are working right I think.
>>
>>   Thanks,
>>
>>      Matt
>>
>
> Is there a document/todo-list sort of thing that outlines the roadmap with
> p4est integration? What things are done/remains to do sort of draft?
>

Toby may have a more extensive one. Shortly, if all you want is for PETSc
to manage the grid, the p4est integration
is done. It works in parallel and can do most things Plex does. For
anything else, it just falls back to Plex. For very large
problems, we might want to write more of the Plex functionality into p4est,
but that would wait for users getting that large.
Most of our work now is concerned with

  - Interfacing with the rudimentary discretization support in PETSc

  - Designing better adaptivity measures

  - Fixing inconsistencies in the interface

 - Supporting mixed grid-particle methods

  Thanks,

     Matt


> Best,
> Mohammad
>
>
>>
>>
>>> Giang
>>>
>>> On Mon, Aug 22, 2016 at 12:45 PM, Matthew Knepley <knepley at gmail.com>
>>> wrote:
>>>
>>>> On Mon, Aug 22, 2016 at 4:05 AM, Praveen C <cpraveen at gmail.com> wrote:
>>>>
>>>>> Dear all
>>>>>
>>>>> We are developing a 3d unstructured grid finite volume code for
>>>>> compressible turbulent flows.
>>>>>
>>>>> Our approach is to use metis/parmetis to partition the mesh.
>>>>> Then read these partitioned mesh files in the MPI-based cfd code for
>>>>> computation.
>>>>>
>>>>> Are there any examples available in PETSc which are similar to this.
>>>>>
>>>>
>>>> That is a pretty difficult problem. The closest example we have is
>>>> probably TS ex11, which can solve
>>>> things like the shallow water equation and Euler. Currently it reads in
>>>> a mesh, partitions in memory,
>>>> and distributes the mesh using MPI. After that it can regularly refine.
>>>> In the next release, we will
>>>> introduce the ability to
>>>>
>>>>   - read a mesh in parallel
>>>>
>>>>   - adaptively refine in parallel using the Pragmatic package
>>>>
>>>>   - load balance after adaptive refinement
>>>>
>>>>   - use adaptive quadtree meshes from p4est
>>>>
>>>>   Thanks,
>>>>
>>>>      Matt
>>>>
>>>>
>>>>> Thanks
>>>>> praveen
>>>>>
>>>> --
>>>> 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
>>>>
>>>
>>>
>>
>>
>> --
>> 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
>>
>
>


-- 
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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