Native Mesh Interface

Table of Contents

• Input Options
• Converting Meshes
  • Converting CUBIT files
  • Converting Gmsh files

The primary way to load meshes into the Open FUSION Toolkit (OFT) is through OFT's native mesh description format, which utilizes HDF5 for data storage. As OFT only provides mesh generation capability for selected cases, most files will be generated by one of the provided conversion scripts described below.

Input Options

In order to load a native mesh file cad_type = 0 must be specified in the mesh_options group (see Mesh settings). The mesh filename and some native-specific options are specified at runtime in the cubit_options group. The options available in this group are listed below.

Option group: native_mesh_options | Option | Description | Type [dim] | |-—|-—|-—| filename,reflect,ref_periodic | filename="" | Name of mesh file | str(OFT_PATH_SLEN) | | reflect=F | Reflect mesh about xy-plane? | bool | | ref_periodic=F | Make mesh periodic in z-direction following reflection? | int |

Converting Meshes

As OFT only provides mesh generation capability for selected cases, most files will be generated by one of the provided conversion scripts from software-specfic formats (eg. CUBIT, gmsh, etc.).

Converting CUBIT files

To convert from CUBIT meshes saved using the Exodus/Gensis file format use the convert_cubit.py script (as below). The --in_file argument must be specified and by default a new file is created in native format with the same name, but *.h5 extension, in the current working directory. Additional options to control inclusion of periodicity information are available (use --help for more information).

~$ python /path/to/oft/bin/convert_cubit.py --in_file=/path/to/cubit_mesh.g

Converting Gmsh files

To convert from Gmsh meshes saved using the MSH file format use the convert_gmsh.py script (as below). The --in_file argument must be specified and by default a new file is created in native format with the same name, but *.h5 extension, in the current working directory.

Note

Currently only Tet/Tri meshes are supported in both linear and quadratic variants.

~$ python /path/to/oft/bin/convert_gmsh.py --in_file=/path/to/gmsh_mesh.msh