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

[Peter Brune]

On Thu, Dec 13, 2012 at 11:29 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> On Dec 13, 2012, at 11:27 AM, Peter Brune <prbrune at gmail.com> wrote:
>
> > An abandoned attempt at this lies dormant in src/snes/impls/multiblock.
>  We could try to revive it.
>
>    Or at least give it a reasonable name :-(  like SNESFIELDSPLIT
>
>
+1


> >
> > - 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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