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/20121213/23eafd6f/attachment.html>
