[petsc-users] The possibility of applying DA to governing multi-block data structure

[Matthew Knepley]

On Sun, Aug 26, 2012 at 10:29 PM, C.-C. Chiou <ccchiou2012 at gmail.com> wrote:

>
> Matt,
>
> Thank you.
>
> Now, I'm dealing with a work like that: (for example)
>
>                   ______
>                   |           |
>                   |           |
>  ________ |           |
> |                 |           |
> |       f1       |    f2    |
> |________ |           |
>                   |           |
>                   |           |
>                   |_____ |
>
> (or please see the attached file "blocks_fig1.png" )
>
> I have a physical domain partitioned into two blocks f1 and f2 (or more
> for other case),
> and I need to solve Navier-Stoke equations concerning on such domain by
> multi-block solver,
> with two connected structured meshes respectively  for f1 and f2.
>
> I wonder whether case like the above for example is considered as one of
> experiment.
>

So for this case we have no easy support. You would have to manually
construct a VecScatter
object which encoded the coupling between the meshes, and there really are
not any examples
of this. Note that Hypre does have a specific interface for this (I think
its SStruct).

  Thanks,

     Matt


> Regards.
>
>
> Chuei-Ching Chiou
>
>
>
> On Wed, Aug 22, 2012 at 6:50 PM, Matthew Knepley <knepley at gmail.com>wrote:
>
>> On Wed, Aug 22, 2012 at 2:52 AM, C.-C. Chiou <ccchiou2012 at gmail.com>wrote:
>>
>>> Dear Mathew,
>>>
>>> Thanks for your response!
>>>
>>> At line 645 in the source code,
>>> http://www.mcs.anl.gov/petsc/petsc-dev/include/petscsnes.h.html ,
>>> some SNES routines for multi-block solver were listed.
>>> Is there any source code for specific testing PDE problem with these
>>> routines?
>>>
>>
>> That is an experiment that does not yet work.
>>
>>
>>> In addition, is the KSP version available?
>>>
>>
>> Its called ASM.
>>
>>    Matt
>>
>>
>>> Sincerely regards.
>>>
>>> Chuei-Ching Chiou
>>>
>>>
>>> On Wed, Aug 8, 2012 at 9:06 PM, Matthew Knepley <knepley at gmail.com>wrote:
>>>
>>>> On Wed, Aug 8, 2012 at 2:30 AM, C.-C. Chiou <ccchiou2012 at gmail.com>wrote:
>>>>
>>>>> Dear all,
>>>>>
>>>>> For concerning more general geometry of physical domain, for some
>>>>> situations,
>>>>> we need to apply the multi-block mesh. The attached figure (or
>>>>> alternatively the following link) illustrates one of examples.
>>>>>
>>>>> https://dl.dropbox.com/u/17189529/share_documents/IMAG0003.jpg
>>>>>
>>>>> Have you ever dealt with such kind of case with application of the
>>>>> PETSc object 'DA' ?
>>>>>
>>>>
>>>> Our intention for this is that you use a DMComposite structure. Let us
>>>> know if the documentation is unclear
>>>> on anything, since it is somewhat new.
>>>>
>>>>   Thanks,
>>>>
>>>>      Matt
>>>>
>>>>
>>>>> Suppose we build multiple DA(or DM) for governing the multi-block data
>>>>> structure,
>>>>> in other words, we respectively build a DA for each block of mesh.
>>>>> Especially in parallel computing,
>>>>> how can we manage and control the communications between blocks of
>>>>> data accurately and efficiently?
>>>>> And, how can we ensure the correctness of parallel computational
>>>>> results?
>>>>>
>>>>> I wonder whether some possible application of PETSc object 'DA' (or
>>>>> DM) is sufficient for dealing with cases in multi-block mesh.
>>>>>
>>>>>
>>>>> Sincerely regards.
>>>>>
>>>>>
>>>>> Chuei-Ching Chiou
>>>>>
>>>>>
>>>>> --
>>>>> Chuei-Ching Chiou,
>>>>> Ph. D student,
>>>>> Aerothermal & Plasma Physics Laboratory
>>>>> Department of Mechanical Engineering
>>>>> National Chiao Tung University
>>>>> Hsinchu 30010, TAIWAN
>>>>> TEL: +886-35712121 ext. 55175
>>>>> E-mail: C <staystay.me99g at g2.nctu.edu.tw>CChiou2012 at gmail.com
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> 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
>>>>
>>>
>>>
>>>
>>> --
>>> Chuei-Ching Chiou,
>>>  Ph. D student,
>>> Aerothermal & Plasma Physics Laboratory
>>> Department of Mechanical Engineering
>>> National Chiao Tung University
>>> Hsinchu 30010, TAIWAN
>>> TEL: +886-35712121 ext. 55175
>>> E-mail: C <staystay.me99g at g2.nctu.edu.tw>CChiou2012 at gmail.com
>>>
>>>
>>
>>
>> --
>> 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
>>
>
>
>
> --
> Chuei-Ching Chiou,
> Ph. D student,
> Aerothermal & Plasma Physics Laboratory
> Department of Mechanical Engineering
> National Chiao Tung University
> Hsinchu 30010, TAIWAN
> TEL: +886-35712121 ext. 55175
> E-mail: C <staystay.me99g at g2.nctu.edu.tw>CChiou2012 at gmail.com
>
>


-- 
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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