[CIG-SHORT] Linear convergence for nonplanar faults

[Josimar Alves da Silva]

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> 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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