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

[Smith, Barry F.]

  Yes, this is a bug. We previously declared a tiny trust region as converged but in fact it is not diverged. In the master branch  it now comes up as a negative value in indicating diverging of the nonlinear solver. Sorry for the confusion.

   Barry


> On Aug 5, 2019, at 10:38 AM, Fande Kong via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
> 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
> 
> -- 
> You received this message because you are subscribed to the Google Groups "moose-users" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to moose-users+unsubscribe at googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/moose-users/f1aa52c1-b146-4703-91f4-a034cbe6be3b%40googlegroups.com.