[CIG-SHORT] 2D Simulations

[Matthew Knepley]

On Wed, Sep 14, 2011 at 10:50 AM, James Moore <james.moore at earth.ox.ac.uk>wrote:

> Dear Brad (or anyone else who can help me),
>
> Further to my previous question, is it possible to implement periodic
> boundary conditions for a 3 D problem, thus negating edge effects?
>

We do not support periodic domains. That seems like a strange setup to me
when your unknowns are displacements. Wouldn't a stress-free condition be
more what you are looking for?

  Thanks,

     Matt


> James
>
> ---------------
> D.Phil Research Student,
> COMET+ Research Group
>
> Department of Earth Sciences,
> University of Oxford,
> South Parks Road,
> Oxford,
> OX1 3AN,
> United Kingdom
>
> -----Original Message-----
> From: cig-short-bounces at geodynamics.org
> [mailto:cig-short-bounces at geodynamics.org] On Behalf Of Brad Aagaard
> Sent: 17 August 2011 18:11
> To: cig-short at geodynamics.org
> Subject: Re: [CIG-SHORT] 2D Simulations
>
> James-
>
> PyLith does not support 2-D out-of-plane deformation. We have not
> implemented this capability because it involves writing extra code to
> handle
> this special case. The workaround is to construct a 3-D model and apply
> Dirichlet boundary conditions to enforce the desired symmetry and extract
> the solution along the centerline. This is more computational intensive but
> works reasonably well.
>
> Brad
>
>
> On 8/17/11 7:39 AM, James Moore wrote:
> > Hello all,
> >
> > I have recently come back to Pylith after a year or so of not having
> > used it and wanted to run some toy problems in 2D. The manual has
> > examples of plane strain problems being solved, however I was interested
> > in running the anti-plane problem, corresponding to shear out of the
> > plane of a 2 dimensional slice through a strike slip fault. I can run
> > the 3D equivalent, and tried applying 3D boundary conditions to a 2D
> > mesh, but it didn't seem to like it very much.
> >
> > Any suggestions?
> >
> > Many thanks,
> >
> > James Moore
> >
> > ---------------
> >
> > D.Phil Research Student,
> >
> > COMET+ Research Group <http://comet.nerc.ac.uk/>
> >
> > Department of Earth Sciences,
> >
> > University of Oxford,
> >
> > South Parks Road,
> >
> > Oxford,
> >
> > OX1 3AN,
> >
> > United Kingdom
> >
> >
> >
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> > CIG-SHORT at geodynamics.org
> > http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>
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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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