[cgma-dev] CGM doc

[De Martin Florent]

Dear Iulian,

Thank you for your advices about MOAB and about the limitation of ExodusII !

Your example should work fine... I'm trying a workaround with ExodusII, but if it fails, I'll try GenLargeMesh and keep you informed of the results.

Best regards,
Florent


De : Grindeanu, Iulian R. [mailto:iulian at mcs.anl.gov]
Envoyé : vendredi 11 mars 2016 14:52
À : De Martin Florent; cgma-dev at mcs.anl.gov
Objet : RE: CGM doc

Dear Florent,
we have an example in MOAB, you can take  a look
It has to be modified to export just the boundary quads
We usually run it in parallel for big meshes, and its output is in hdf5 format.
http://ftp.mcs.anl.gov/pub/fathom/moab-docs/GenLargeMesh_8cpp-example.html

You can afterwards run mbconvert to export in exodus format
mbconvert large.h5m large.exo
We used this to generate billions of hexas, to test I/O

our exodus is in serial, and never pushed it this high, but you could try

geometry is very regular

you can control though dx, dy, etc

Would something like this work?

Iulian
________________________________
From: De Martin Florent [F.DeMartin at brgm.fr]
Sent: Friday, March 11, 2016 4:09 AM
To: Grindeanu, Iulian R.; cgma-dev at mcs.anl.gov<mailto:cgma-dev at mcs.anl.gov>
Subject: RE: CGM doc
Dear Iulian,

Thank you for your prompt response and your advices.

To answer your questions, EFISPEC3D reads ExodusII mesh file generated by CUBIT. Boundary conditions are either free surface (made of QUAD) or absorbing boundaries (made of QUAD). But unfortunately, the NetCDF API inside CUBIT fail to generate a mesh of 200+ millions of hexa. The mesh is very basic: only a cubic domain meshed by millions of hexa. So I was looking for an open-source code (CUBIT is not) to generate such a mesh...

Best regards,
Florent

De : Grindeanu, Iulian R. [mailto:iulian at mcs.anl.gov]
Envoyé : jeudi 10 mars 2016 17:00
À : De Martin Florent; cgma-dev at mcs.anl.gov<mailto:cgma-dev at mcs.anl.gov>
Objet : RE: CGM doc

Hello,
CGM alone would not be enough to generate a mesh
CGM is mostly a wrapper around other geometry kernels, ACIS or OCC/OCE based.
To generate a mesh you would need the SIGMA stack.
http://sigma.mcs.anl.gov/

I am not familiar with what format you need your mesh for EFISPEC3D; I assume it is similar to NEK5000 solver, which is a spectral element method too. (so Nek needs a hexahedral mesh)

And what is the input geometry format? Terrain data?
We have some capabilities developed for ice sheet modeling. At the core, they do need a quadrilateral mesher for surfaces, which are then extruded/swept to form hexahedral elements. Also, it is assumed that the domain of interest does not have internal caves/tunnels, so the sweeping in vertical direction is trivial.

I am not sure how these would help your project.

Iulian
________________________________
From: cgma-dev-bounces at mcs.anl.gov<mailto:cgma-dev-bounces at mcs.anl.gov> [cgma-dev-bounces at mcs.anl.gov] on behalf of De Martin Florent [F.DeMartin at brgm.fr]
Sent: Thursday, March 10, 2016 9:19 AM
To: cgma-dev at mcs.anl.gov<mailto:cgma-dev at mcs.anl.gov>
Subject: [cgma-dev] CGM doc
Dear CGM support,

I am interested to generate large scale finite element meshes for the spectral-element code EFISPEC3D (http://efispec.free.fr)
I have downloaded (from git) and compiled CGM, but I can hardly find a user documentation. Would you please send it to me ?

Best regards,
Florent DE MARTIN
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