[CIG-LONG] Negative Pressures in Gale

[Steve Quenette]

Hi Mark,


FYI: the underworld/stgermain mailing list is:
underworld-users at vpac.org . If you do mail there, you should also CC in
the GALE one.


Steve.





On Mon, 2008-02-25 at 14:49 -0700, Mark Fleharty wrote:
> On Sat, Feb 23, 2008 at 6:23 PM, Walter Landry <walter at geodynamics.org> wrote:
> > "Mark Fleharty" <mark.fleharty at gmail.com> wrote:
> >  > This produces an output.extension directory that has a lot of various
> >  > data, 500 time steps in all.  Looking through the pressure*.vtk files
> >  > I can verify that I have negative numbers, but I'm not sure what this
> >  > means.  I also notice them when I view them with paraview.  I've
> >  > attached an image file demonstrating the problem.
> >
> >  Negative pressure means that the element is undergoing an expansive,
> >  rather than compressive stress.  It is expected for that setup.
> >  The hydrostatic pressure, especially near the top, is rather small.
> >  Thus, any dynamic pressure easily overcomes the hydrostatic pressure.
> 
> Ok, great, thanks that helps a lot.
> 
> >  > Also, does anyone have any tips on how to create St.Germain input XML
> >  > files.  I've looked through the documentation as best I can, and I
> >  > think I'm confused about some of the basics.  Is there any other
> >  > documentation available on St. Germain outside of Gale that people
> >  > could recommend?
> >
> >  There is the documentation for Underworld at
> >
> >   http://www.mcc.monash.edu.au/Software/UnderworldModels
> >
> >  Gale is mostly the same underlying software, although not entirely the
> >  same.  So the models probably won't work out of the box, but they may
> >  give you a better idea of how to create models.
> 
> Great.  Thanks, this appears to be useful.
> 
> Thanks,
> 
> Mark
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-- 
Steve Quenette
Computational Software Development Manager / Senior Consultant
Victorian Partnership for Advanced Computing
(m) +61 438 558 275, (w) +61 3 9925 4726, (f) +61 3 9925 4647
http://csd.vpac.org