[CIG-SHORT] Linear convergence for nonplanar faults

[Brad Aagaard]

Josimar,

I have not seen any significant effects on convergence for the nonplanar 
geometry problems I have done. It sounds like you are zeroing in on the 
problem.

Brad


On 11/09/2016 07:42 AM, Josimar Alves da Silva wrote:
> Brad,
>
> I changed the boundary conditions for Dirichlet BC with constrained
> displacement perpendicular to the surfaces, but the problem still
> persists. I am starting to wonder if the nonplanar nature of the fault
> surface may be causing the problem.
>
> The reason for this hypothesis is that I have the same set up but now
> with flat surfaces, and then in this case I don't find any convergence
> issue. Everything else was kept the same, except the fault geometry was
> changed from slightly smoothed (the version I am having problems) to not
> smoothed.
>
> Let me know what you think about this.
> Thank you
> Josimar
>
>
>
>
> On Wed, Nov 9, 2016 at 10:20 AM, Brad Aagaard <baagaard at usgs.gov
> <mailto:baagaard at usgs.gov>> wrote:
>
>     On 11/09/2016 07:15 AM, Josimar Alves da Silva wrote:
>
>         Dear Brad, Matt and Charles,
>
>         Thank you again for the suggestions. After reviewing your comments I
>         performed the following task in order to solve my problem:
>
>         Brad mentioned:
>
>          "1. Without a fault, check convergence with using ML for
>         the preconditioned."
>
>                  Result: the solver converges fine without the fault and
>         using
>         the specified preconditioned.
>
>         "2. Add the fault and with zero prescribed slip (FaultCohesiveKin),
>         examine the convergence with the solver_fault_fieldsplit.cfg
>         parameters."
>
>                  Results: no convergence for any solver. Error message:
>         Linear
>         solve did not converge due to DIVERGED_ITS iterations 10000
>
>
>     This suggests there is something wrong with your problem setup. Make
>     sure you have sufficient Dirichlet BC on each side of the fault to
>     prevent rigid body motion.
>
>     Brad
>
>
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