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

[Mark Adams]

On Thu, Aug 25, 2016 at 9:46 AM, Karin&NiKo <niko.karin at gmail.com> wrote:

> 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).
>
> This does not sound stable.


> 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
>
> Your picture looks like this problem.


> 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
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20160826/56a00d84/attachment-0001.html>