[CIG-SEISMO] Problems in seismograms - Specfem3D

[Surendra Nadh Somala]

Dear Jérôme,
I recommend that you use CUBIT/Python interface to create mesh files that
are usable by scotch (the graphical partitioner), unlike gmsh.
Best,
Surendra

___________
*Surendra Nadh Somala*
Assistant Professor
Department of Civil Engineering (Block-E, 208)
Indian Institute of Technology (IIT) Hyderabad
Kandi, Sangareddy
Telangana, India - 502285
Phone : +91 (0)40 2301-8457
http://civil.iith.ac.in/surendra/

On Thu, Oct 26, 2017 at 5:29 PM, AZZOLA Jerome (JDS) <
jerome.azzola at unistra.fr> wrote:

> Hello,
>
> First, I would like to thank CIG Seismology for providing Specfem3D
> Cartesian and other very useful Software with free access.
> I was working with Specfem2D to simulate propagation of waves in a plate
> with holes that I mesh using the external mesher GMSH. I would like now to
> model the same problem using Specfem3D. For my convenience, I have to use
> GMSH to mesh the propagation medium, which is still a perforated plate. I
> join my data files and an output. I would like to propose you the link
> above to have a closer look to the geometry and the mesh files I use also:
> https://drive.google.com/open?id=0BzMCuLE_smWxR001V1lZbFM4Y2s
> The problem is that the seismograms that I obtain show wiggles that I
> relate to computational instability. If I use a higher sampling rate, the
> hysteresis is even increased. I don't understand the origin of the problem.
> It seems that the mesh has no influence because the increase of the number
> of elements is not a solution. I have the same problem when I simulate the
> propagation in a plate without holes. I checked the stability coefficient
> for wave velocity in the output files and the skewness of my elements. Do
> you have any idea about the origin of this instability ?
> Cordially,
>
> --
>
> Jérôme AZZOLA
> Doctorant en géosciences
> Tél : +33 (0)7 68 54 92 57
> azzola at unistra.fr
> jerome.azzola at gmail.com
> [image: www.unistra.fr] <http://www.unistra.fr>
> EOST - Ecole et Observatoire des Sciences de la Terre
> 5, rue René Descartes
> F - 67000 Strasbourg
>
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