[petsc-dev] Fwd: Is there any example that allows time-integration provided by users

[Peter Brune]

An abandoned attempt at this lies dormant in src/snes/impls/multiblock.  We
could try to revive it.

- Peter


On Thu, Dec 13, 2012 at 11:25 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Yes, but even more than linear fieldsplit, there are _many_ variations,
> involving nonlinear change of basis and various types of elimination. I
> worry that it may be even more complicated and harder to use.
>
>
> On Thu, Dec 13, 2012 at 9:15 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>
>>   We could possibly provide the equivalent of PCFieldSplit for nonlinear
>> problems?  These could be accelerated via the various non-linear
>> accelerates or even via matrix-free Newton?
>>
>>
>>    Barry
>>
>>
>> Begin forwarded message:
>>
>> *From: *Jed Brown <jedbrown at mcs.anl.gov>
>> *Subject: **Re: Is there any example that allows time-integration
>> provided by users*
>> *Date: *December 13, 2012 11:06:29 AM CST
>> *To: *Lulu Liu <lulu.liu at kaust.edu.sa>, Barry Smith <bsmith at mcs.anl.gov>
>>
>> It sounds like you want to do classical operator splitting (which is
>> notoriously inaccurate). The literature on these methods is rife with
>> special-purpose band-aids that I'd rather not try to support all of in
>> PETSc.
>>
>> My preference would be to write your method as an ARKIMEX, with "trivial"
>> implicit part on the "part" of the equation that you wanted to treat
>> explicitly, or if you wanted to solve both implicitly (but decoupled) then
>> do the appropriate incomplete solve. Can you be more specific about what
>> problem you want to solve?
>>
>>
>> On Wed, Dec 12, 2012 at 7:42 AM, Lulu Liu <lulu.liu at kaust.edu.sa> wrote:
>>
>>> There is two equations in my system, and I want solve the first one, and
>>> then solve the second equation. Is there any example that allows me to
>>> solve equations one by one?
>>>
>>>
>>> I want to solve nonlinear system on every time level, but it is feasible
>>> if I could provide the time discretization schemes by myself. Is there any
>>> example about this?
>>>
>>> Thank you!
>>>
>>> --
>>>  Best wishes,
>>> Lulu Liu
>>> Applied Mathematics and Computational Science
>>> King Abdullah University of Science and Technology
>>> Tel：＋966－0544701599
>>>
>>>
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>>
>>
>>
>>
>
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