[CIG-SHORT] Dirichlet displacement-normal boundary condition?

[Charles Williams]

Keep in mind that Dirichlet BC would not exactly be the same as a volumetric expansion or contraction, since you are fixing the absolute displacement in the interior of your domain.

Depending on the geometry of your problem, you could still use Neumann BC, or you might even consider having material in the reservoir and applying an initial strain.

Cheers,
Charles


On 14/07/2013, at 4:19 AM, Matthew Knepley wrote:

> On Sat, Jul 13, 2013 at 11:17 AM, Brad Aagaard <baagaard at usgs.gov> wrote:
> Scott,
> 
> Specifying a Dirichlet boundary condition using an orientation other than the coordinate axes is not implemented. I think you are the first person to request this feature. We do have a DirichletBoundary setup that associates a boundary mesh with a Dirichlet boundary condition so the orientation information could be setup. We will add this to a list of features to consider adding in a future release (right now we have several features to add that are higher priority).
> 
> Right now, since you know the normal, you could specify a Cartesian Dirichlet BC as a stopgap.
> 
>    Matt
>  
> Regards,
> Brad
> 
> 
> On 7/13/13 9:01 AM, Scott Henderson wrote:
> Hello,
> 
> I'm wondering if it's possible to specify a 'normal displacement' boundary condition along a curved surface in PyLith. For example 'displacement-normal', similar to 'traction-normal' for the Neumann condition.
> 
> This would be useful to represent fixed volumetric expansion or contraction of a subsurface reservoir (e.g. hydrothermal or magmatic).
> 
> Thanks,
> Scott
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Charles A. Williams
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GNS Science
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