[CIG-SHORT] small-scale crack opening convergence problem

[Matthew Knepley]

On Mon, Oct 29, 2012 at 11:25 AM, Scott Henderson <scottyhq at gmail.com>wrote:

> Hello CIG-users,
>
> I've been trying to use Pylith for a "single edge notch in tension (SENT)"
> fracture mechanics simulation. In order to do this I've modified step20.cfg
> to be a 2D plane-stress problem. I've also followed what I could from this
> mailing-list post (
> http://www.geodynamics.org/pipermail/cig-short/2012-September/001120.html).
> I'm still not able to get expected results, which makes me think I' doing
> something incorrectly with the pylith settings (PETSC in particular). I'm
> pretty new to the software, so any tips on the cubit mesh or pylith cfg
> files would be appreciated (zipped folder attached).
>
> Essentially, I'm not getting the expected u2 displacements from this
> analysis (but they are not unreasonable), and the following SNES output
> makes me concerned:
>
> 500 SNES Function norm 2.483466683115e-06
> Nonlinear solve did not converge due to DIVERGED_MAX_IT iterations 500
>
> Increasing snes_max_it doesn't seem to lead to convergence.
>

Always send all output. The nonlinear solver is not converging, but the
first thing to check is
how the linear solver is doing inside. Also, I want to see exactly what
solver setup you have.

    Matt


> Any suggestions appreciated,
> Scott
>
>
>
>
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>


-- 
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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