[petsc-users] Setting step acceptance criteria and/or domain validity using TS module

[Pierre Barbier de Reuille]

Ok, I made progress. But:

 1 - whatever I do, I have very slightly negative values, and therefore all
my steps get rejected (values like 1e-16)
 2 - As I expected, SNES is only used with implicit methods. So if I use
explicit Runge-Kutta, then there is no solution vector stored by the SNES
object.

Reading the code for the Runge-Kutta solver, it seems that TSPostStage is
where I can retrieve the current state, and TSAdaptCheckStage where I can
reject it. But is this something I can rely on?

Thanks,

Pierre

On Wed Feb 11 2015 at 02:45:26 Jed Brown <jed at jedbrown.org> wrote:

> Pierre Barbier de Reuille <pierre.barbierdereuille at gmail.com> writes:
>
> > Ok, it seems if I set the domain error from the rhs function, it will
> > indeed fail and backtrack. I hope that is what was intended?
>
> Yes, the PostStep (or PostStage) callbacks are not intended for this.
>
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