[petsc-users] snes converged reason for newton trust region?

[Fande Kong]

I have zero experience on the trust region Newton. I would like PETSc Team
 chime in.

Fande,

On Mon, Aug 5, 2019 at 9:34 AM Gary Hu <hugary1995 at gmail.com> wrote:

> Hello Group,
>
> When I use -snes_type newtontr
>
> I sometimes get CONVERGED_TR_DELTA instead of CONVERGED_FNORM.
>
> My guess is that the trust region size keeps reducing until it becomes
> smaller than the tolerance.
>
> Is there a way to force the algorithm to converge only due to FNORM?
>
> Thanks,
> Gary
>
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