[petsc-users] snes options for rough solution

[Matthew Knepley]

On Sun, Dec 11, 2016 at 11:23 PM, Praveen C <cpraveen at gmail.com> wrote:

> Dear all
>
> I am solving a nonlinear parabolic problem with snes. The newton update is
> rather non-smooth and I have convergence problems when using default
> options.
>
> Attached figure shows how solution changes in two time steps.
>

It is not clear what you mean here. Newton does not solve timestepping
problems. Maybe you are using it
with an implicit timestepper, but its still not clear what you mean by
non-smooth updates. Did you try with
TS?

   Matt


> Are there any special algorithms/options in snes that I can use for such
> problem ?
>
> Thanks
> praveen
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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