[CIG-SEISMO] Model error in mesh

[ed cas]

Hello Dr. Komatitsch, Dr. Cristini and everyone,

Thank you for following up my questions.
I am sorry for my late response (sometimes I am doing field work).

I am going to try Dr. Komatitsch suggestion.
Before Dr. Komatitsch suggestion, I tried to solved that problem (of
direction) by including a negative sign on some lines
that where on opposite direction, but I am going to check the model once
again.


Sincerely

------------------------
Ed Castillo



On Mon, Aug 20, 2018 at 12:46 PM Dimitri Komatitsch <
komatitsch at lma.cnrs-mrs.fr> wrote:

>
> Dear Ed, dear all,
>
> If your Jacobians are all negative, your mesh is likely good, it is just
> that you export the points in reverse order (clockwise instead of
> counterclockwise).
>
> What is not good is positive and negative in the same mesh; all positive
> or all negative is OK. (in the latter case, you need to flip them once
> and for all before importing the mesh in SPECFEM)
>
> Best wishes,
> Dimitri.
>
> On 08/17/2018 11:18 PM, cristini paul wrote:
> > Dear Ed,
> >
> > Please could you provide more information on the type of error you are
> > getting.
> >
> > If it is connected to the quality of the mesh (too distorted) then
> > depending on the geometry, it is sometimes difficult to get a good mesh
> > with Gmsh without dividing the geometry into several elementary parts.
> >
> > Let me also remind you that you need to define your line loops in a
> > counter clockwise manner as it is done in the Gmsh example provided with
> > Sepcfem2D otherwise you will get negative jacobians.
> >
> > Thank you
> >
> > Best regards
> >
> > Paul
> >
> >
> >
> > Le 17/07/2018 à 00:20, ed cas a écrit :
> >> Dear developers and users,
> >>
> >>
> >> I have been trying to produce a readable mesh file
> >> for specfem2d by using gmsh.
> >>
> >> I produced the mesh inside gmsh, I saved the mesh and then paste it to
> >> the MESH directory
> >>
> >> and then run the command
> >>
> >> python LibGmsh2Specfem_convert_Gmsh_to_Specfem2D_official.py
> >> model_shallow_v42 -t A -b A -r A -l A
> >> That produced the five files in the same directory.
> >>
> >> Please find attached the file I have been trying to run
> >> (model_shallow_v42).
> >>
> >> However, when running specfem2d gives error telling me about Jacobians,
> >> I have been trying for a couple of days and cannot get with the error,
> >> I checked the
> >> line loops and seems  fine , I have resized the elements and with no
> >> success.
> >>
> >> I was hoping you could help me with this.
> >> Could you please check my file and indicate me what is wrong with it,
> >> and any solution.
> >>
> >> I would really appreciate your help,
> >>
> >> Thank you for your time and help,
> >>
> >> Sincerely,
> >>
> >> -------------------------------------------
> >> Edwin Castillo
> >>
> >>
> >>
> >> _______________________________________________
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> >> CIG-SEISMO at geodynamics.org
> >> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
> >
> > --
> >
> *--------------------------------------------------------------------------*
> >   Paul CRISTINI  Charge de Recherche CNRS (HDR) / CNRS Research Scientist
> >
> *--------------------------------------------------------------------------*
> >   CNRS - Laboratoire de Mecanique et d'Acoustique (UMR 7031)
> >   Bureau 119
> >   4 Impasse Nikola Tesla, CS 40006, F-13453 Marseille Cedex 13 - France
> >   mailto:cristini at lma.cnrs-mrs.fr
> >   phone number: +33 (0)4 84 52 42 51
> >   http://www.lma.cnrs-mrs.fr/
> >
> *--------------------------------------------------------------------------*
> >
> >
> >
> > _______________________________________________
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> > CIG-SEISMO at geodynamics.org
> > http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
> >
>
> --
> Dimitri Komatitsch, CNRS Research Director (DR CNRS)
> Laboratory of Mechanics and Acoustics, Marseille, France
> http://komatitsch.free.fr
>
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