[CIG-SHORT] Issue with Normal Orientation

[Matthew Knepley]

On Wed, Feb 18, 2015 at 9:21 AM, Romain Jolivet <jolivetinsar at gmail.com>
wrote:

> Hello,
>
> I am having some more problems with the orientation of the vectors normal
> to the fault.
>
> My problem is in 2D, with a fault slicing the entire medium (see tar ball
> attached).
> The fault is FaultCohesiveKin class. I enforce the slip.
>
> When I run with 1, 2, 3, 5, 7 or 9 nodes, I have one orientation for the
> vectors normal to the fault.
> When I run with 4, 6 or 8 nodes, I have the opposite orientation.
> I haven’t tried with more nodes.
>
> That should not happen, right?
>

This can happen. We have to choose some orientation for the fault, and
different partitions
produce different starting points, and thus the fault can have the opposite
normal.

  Thanks,

     Matt


> In terms of codes versions:
>
> Pylith version:
> >> git log
> commit 30f0bbe7ea750d78005f76cff5f3ca9868a89fa7
> Merge: f047ab5 1327120
> Author: Brad Aagaard <baagaard at usgs.gov>
> Date:   Fri Feb 13 17:09:54 2015 -0800
>
>     Merge branch 'baagaard/add-release-2.1.0'
>
>
>     * baagaard/add-release-2.1.0:
>       Reset permissions for full-scale test scripts.
>       Reset permissions for pytest drivers.
>       Update script making petsc tarball.
>       Updated release notes.
>       Updated copyright.
>       Updated release information.
>       Add updates from README to release announcement.
>       Added a description of new 2D gravity example.
>       Added description of DP plasticity changes to README.
>       Updates to info on new features.
>       Started work on release notes for v2.1.0.
>       Updated version number in configure.ac.
>       Updated version version number in manual to v2.1.0.
>
> PETSc version:
> >> git log
> commit 04fcc16b6fc1fef768ea84f574fa77a92547ade2
> Merge: a1925ac ae5cfb4
> Author: Matthew G. Knepley <knepley at gmail.com>
> Date:   Tue Feb 10 07:14:54 2015 -0600
>
>     Merge branch 'knepley/fix-veclock-fftw' into knepley/pylith
>
>
>     * knepley/fix-veclock-fftw:
>       DM: Fix more Vec lock issues
>       FFTW: Updated for vector locking
>
> Cheers,
> R
>
>
>
>
> —————————————————————————————————————
> —————————————————————————————————————
> Romain Jolivet
> Postdoctoral Fellow
>
> University of Cambridge
> Department of Earth Sciences
> Bullard Labs
> Madingley Rise
> Madingley Road
> Cambridge CB3 0EZ
> United Kingdom
>
> email: rpj29 at cam.ac.uk
> Phone: +44 1223 748 938
> Mobile: +44 7596 703 148
>
> France: +33 6 52 91 76 39
> US: +1 (626) 560 6356
> —————————————————————————————————————
> —————————————————————————————————————
>
>
> _______________________________________________
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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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