[CIG-SEISMO] Exporting mesh from Trelis to SPECFEM3d

[Hom Nath Gharti]

Very important point!

Always use:

imprint all
merge all

commands before meshing. If you have split surfaces, for example,
finite fault, you have to unmerge specific surface before meshing.


On Tue, Mar 29, 2016 at 3:36 PM, Daniel B. Peter
<daniel.peter at kaust.edu.sa> wrote:
> 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> 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>
> 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>
>> 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> 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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