Re: [Libmesh-devel] TSGL and other time integration packages

2010-03-02 Thread Jed Brown
On Tue, 2 Mar 2010 12:14:46 -0700, Derek Gaston wrote: > This is what we do now and we match the implicit and explicit > integration orders. This is really what we'd need to be able to do before I > could use TSGL. I thought that might be the case. Out of curiosity, have you compared to tre

Re: [Libmesh-devel] TSGL and other time integration packages

2010-03-02 Thread Derek Gaston
On Tue, Mar 2, 2010 at 11:44 AM, Jed Brown wrote: > * At each stage of the implicit system, integrate the explicit system up > to the current stage using interpolated values of the implicit system. > If the final abscissa is 1 and the implicit method has full stage > order, then I think this i

Re: [Libmesh-devel] TSGL and other time integration packages

2010-03-02 Thread Jed Brown
On Tue, 2 Mar 2010 11:19:04 -0700, Derek Gaston wrote: > Any other comments about this? I'm still thinking about it. > > Also... does anyone (Jed?) know how to advance and explicit system alongside > an implicit system with TSGL? There are multiple levels of coupling that you could use. Starti

Re: [Libmesh-devel] TSGL and other time integration packages

2010-03-02 Thread Derek Gaston
Any other comments about this? I'm still thinking about it. Also... does anyone (Jed?) know how to advance and explicit system alongside an implicit system with TSGL? What I mean is that I'm solving a transient nonlinear implicit system... but I also have a system of explicit variables that I dr

Re: [Libmesh-devel] TSGL and other time integration packages

2010-01-26 Thread Derek Gaston
On Jan 26, 2010, at 1:30 PM, Jed Brown wrote: > Note that TSGL is just like any other TS implementation, your code > doesn't need to make any explicit reference to it, just set up a TS, > call TSSolve, and then it can be used via -ts_type gl. Admittedly, many > of the TS implementations are prett

Re: [Libmesh-devel] TSGL and other time integration packages

2010-01-26 Thread Jed Brown
On Tue, 26 Jan 2010 13:18:20 -0700, Derek Gaston wrote: > So... Jed's comments on TSGL today brought to mind something I've been > meaning to bring up. > > Is there any plan for incorporating time integration packages into > libMesh? We have NonlinearImplicitSystem mapping to SNES or > NOX... s

[Libmesh-devel] TSGL and other time integration packages

2010-01-26 Thread Derek Gaston
So... Jed's comments on TSGL today brought to mind something I've been meaning to bring up. Is there any plan for incorporating time integration packages into libMesh? We have NonlinearImplicitSystem mapping to SNES or NOX... shouldn't TransientNonlinearImplicitSystem map to TSGL or Rhythmos?