Create a Trelis to mds mesh importer

[nelson15]

Hi everyone,

I am working on a collaboration with Coreform to run a PHASTA simulation using their mesh. They store their meshes in a .trelis file, which is formatted in standard HDF5 style. Attached is a .trelis file (changed to .txt so Github would not complain) containing a 3x3x3 hex mesh of a cube. The mesh file can be opened directly in HDFView (a program put out by HDF group for viewing HDF5 files). The file contains all of the information necessary to build a gmi model and an apf::Mesh2. The mesh was generated in Coreform's Trelis 17 software (which was originally created by the company CSimSoft as a commercialization of Sandia's Cubit mesh technology).

At the end of the day, I need to be able to load this mesh into Chef, pepper it with a tensor field on the hex elements and pass the mesh/that data to a modified PHASTA where the rather vanilla mesh and the tensor field will be used to generate a U-Spline discretization within PHASTA.

As far as this issue request goes, we are only looking for an import of a C^0 mesh that can be passed along through Chef to PHASTA.

cube.txt

I have been discussing with @cwsmith and he has urged me to make an issue here.

Thank you so much,
Corey

[nelson15]

Here is my first pass at writing this importer (for hex meshes only). My biggest issue is including gmi data. The .trelis mesh file has topological information (almost identical to a .dmg file) so this should be possible to use that.

This is heavily based on the mdsGMSH.cpp file.
mdsTrelis.txt