[CIG-SHORT] Speed up nonlinear solver for faults with friction

[Matthew Knepley]

On Mon, Dec 22, 2014 at 4:34 PM, Charles Williams <willic3 at gmail.com> wrote:
>
> Hi Jiangzhi,
>

Note that you should refer both to the tutorial section on friction and
that on solvers.

 Thanks,

    Matt


> Brad is gone for the holidays, so I’m not sure if he is checking e-mail.
> Is this a 3D problem based on the 2D subduction zone example?  I don’t know
> what your other solver settings are, but for that example we used asm for
> the linear solver.  The reason is because that problem is technically
> singular when both faults cut entirely through the domain and there are no
> BC applied to the slab.  If that is not the case for your problem you can
> use field_split (see, for example, examples/3d/tet4/step04.cfg). That
> should speed up your linear solution.  As far as the nonlinear solution,
> that’s a bit trickier and we would need to see your solver settings.
>
> Cheers,
> Charles
>
>
> > On 23/12/2014, at 10:52 am, Jiangzhi Chen <jiangzhi at uoregon.edu> wrote:
> >
> > Hi Brad,
> >
> >   Is there some way to speed up the nonlinear solver when calculating
> the interseismic fault deformation with friction on the fault? In my
> current simulation, when I use kinematic constraints on faults, the whole
> calculation takes about 10 hours, but if I use friction instead of fault
> slip, the calculation seems to run forever (it has been running on server
> during the whole AGU week but not even the first time step is completed). I
> attached the configuration file.
> >
> > cheers,
> > Jiangzhi
> > <interseismic9.cfg>_______________________________________________
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>
> Charles A. Williams
> Scientist
> GNS Science
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>
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