[CIG-SHORT] Constant displacement boundary condition

[Matthew Knepley]

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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