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 > >> > >> > >> This message and its contents, including attachments are intended > solely for the original recipient. If you are not the intended recipient or > have received this message in error, please notify me immediately and > delete this message from your computer system. Any unauthorized use or > distribution is prohibited. Please consider the environment before printing > this email. > >> > > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20121213/8fa34fb7/attachment.html>
