[petsc-users] Command lines to reproduce the tests of "Composing scalable nonlinear algebraic solvers"

[Karin&NiKo]

Dear PETSc gurus,

Thanks to the help of Matthew, I have been able to reproduce in PETSc some
tests of the paper of Peter Brune et al. entitled "Composing scalable
nonlinear algebraic solvers", with special attention to the elasticity test.
I have also tried to reproduce it in a widely used mechanics finite element
solver and I cannot obtain the same results, mainly because of my lack of
undestanding of the boundary conditions and of the loading.

According to the paper, I undestand that the edges in red in the attached
image are fully clamped. If I do that, I do observe a rotation of the grey
 face (see attached image).

If I clamp the over-mentioned edges plus I forbid the normal displacement
of the grey face, I get a quite similar warped shape but the details of the
deformation near the clamped faces are very different

In the paper, the loading is defined as a volume force applied to the whole
structure whereas in Wriggers' book, it is defined as a nodal force.

Could you please give me some details on these points?

Best regards,
Nicolas

2016-08-23 20:25 GMT+02:00 Matthew Knepley <knepley at gmail.com>:

> On Tue, Aug 23, 2016 at 10:54 AM, Karin&NiKo <niko.karin at gmail.com> wrote:
>
>> Dear PETSc team,
>>
>> I have read with high interest the paper of Peter Brune et al. entitled
>> "Composing scalable nonlinear algebraic solvers".
>> Nevertheless I would like to be able to reproduce the tests that are
>> presented within (mainly the elasticity problem, ex16).
>>
>> Could you please provide us with the command lines of these tests?
>>
>
> I believe Peter used the attached script.
>
>   Thanks,
>
>      Matt
>
>
>> Best regards,
>> Nicolas
>>
>
>
>
> --
> 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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