[CIG-SEISMO] Exporting mesh from Trelis to SPECFEM3d

[Daniel B. Peter]

Dear Aymen,

please also note that even if you manage to export it into the specfem-format, SPECFEM3D needs a conforming mesh. in your picture, the mesh looks different for different volumes. you will need to merge the common surfaces between different volumes first and then create a mesh with common mesh points on these surfaces.

for the mesh in the picture, i’m not sure if SPECFEM3D would work. even if reading in the mesh would work, the volumes would be seen as separate domains and seismic waves would only propagate within the volume where your source will be located. since there will be no common mesh points between the volumes, there will be no coupling from one volume to another, thus waves will bounce off the volume surfaces without continuing into neighboring volumes.

best wishes,
daniel






On Mar 29, 2016, at 10:02 PM, emanuele casarotti <emanuele.casarotti at ingv.it<mailto:emanuele.casarotti at ingv.it>> wrote:

please wait, the new version of geocubit is almost ready to be included in the package.
Internal boundary should be now detected (and not included) but in general features like yours should be defined by hand, in particular the lateral boundaries of the top part of the cylinder will be not recognized as free surfaces.

In your case is not difficult to assign by hand the bc.
for example if you want to assign the top surfaces to the free surface you can specify

block 1001 face in surf 1 3 6

where 1 3 6 are the id number of the surfaces that you want




On Tue, Mar 29, 2016 at 8:37 PM Hom Nath Gharti <hgharti at princeton.edu<mailto:hgharti at princeton.edu>> wrote:
Sorry there were some typos in two files! Attached updated.

On Tue, Mar 29, 2016 at 2:26 PM, Hom Nath Gharti <hgharti at princeton.edu<mailto:hgharti at princeton.edu>> wrote:
> Dear Aymen & Junwei,
>
> It seems that CUBIT_GEOCUBIT has some issues in defining the
> boundaries if there are internally embedded objects. Automatically
> defining boundaries for complicated models is sometimes tricky. I
> think Emanuele Casarotti is looking into this issue.
>
> We also use another program (attached) to convert TRELIS/CUBIT file to
> SPECFEM3D files. In order to use this program you need to define
> element blocks and boundary surfaces yourself in the TRELIS/CUBIT.
> This allows you to define boundary surfaces in any complex models.
> Additionally, NetCDF (http://www.unidata.ucar.edu/software/netcdf/)
> library has to be installed. Generally, this is installed by default
> in Linux. You can type "ncdump" in your terminal to check whether the
> NetCDF is installed.
>
> Step by step instructions are included in README file.
>
> I hope this helps.
>
> PS: This program works only on latest version of TRELIS/CUBIT. Older
> versions have slightly different formats. If you have older versions
> let me know.
>
> Best,
> Hom Nath
>
>
> On Tue, Mar 29, 2016 at 10:56 AM, Aymen MHENNI <aymen_mhenni at hotmail.com<mailto:aymen_mhenni at hotmail.com>> wrote:
>> Dear SPECFEM developers,
>>
>> I have created a geometry with Trelis Pro 15.0 (attached file) and i want to
>> export mesh from Trelis to SPECFEM3d.
>> Can you please give me more details about using CUBIT_GEOCUBIT.
>>
>> Best regards,
>>
>> Aymen
>>
>>
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