[CIG-SHORT] Constant displacement boundary condition

[Mamun Miah]

Thanks, Matt for your quick reply. Actually, I am not explicitly specifying
the constant displacement. A load is being applied on the top and bottom of
the specimen and I have to make sure that specimen compresses uniformly on
the top and bottom sides by the action of rigid plates. Not sure it was
clear enough. Please look at the mandel.jpg I attached earlier.

On Tue, Oct 27, 2015 at 10:18 AM, Matthew Knepley <knepley at mcs.anl.gov>
wrote:

> On Tue, Oct 27, 2015 at 12:15 PM, Mamun Miah <mmiah at go.olemiss.edu> wrote:
>
>> Dear Brad et al.,
>>
>> I am trying to model Mandel's problem with TOUGH2-PyLith where I need to
>> make sure that there is a constant displacement boundary condition (i.e. Uz
>> = const. at +- b) at the top and bottom boundaries (please see mandel.png).
>> The load has to be applied on the specimen through rigid plates that makes
>> sure that there is no differential displacement on the top and bottom sides
>> with time.
>>
>> Right now, I am applying a 'traction-normal' on the +Z and -Z surfaces as
>> Neumann BCs in the geometry attached (specimen.png). But it does not seem
>> to replicate the load application through RIGID PLATES.
>>
>> Any idea or hints would be appreciated.
>>
>
> If you want a guaranteed displacement, why would you use traction
> conditions? That seems crazy. Why not
> just use a Dirichlet displacement condition? That is what they are for.
>
>   Matt
>
>
>> Mamun
>> --
>> Thanks & Best Regards,
>>
>> Mamun Miah
>> Graduate Research Assistant
>> Department of Civil Engineering
>> The University of Mississippi
>> Oxford, MS 38655
>> Phone: (662)-801-1904
>> Website: http://www.linkedin.com/pub/mamun-miah-eit/21/53/339
>>
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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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-- 
Thanks & Best Regards,

Mamun Miah
Graduate Research Assistant
Department of Civil Engineering
The University of Mississippi
Oxford, MS 38655
Phone: (662)-801-1904
Website: http://www.linkedin.com/pub/mamun-miah-eit/21/53/339
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