Meshgen v0.2.11

This is a small tool to extract meshes from finite element solvers. In particular JCMsuite and COMSOL are supported.

Usage

for example run as

meshgen test/helix.jcm test/helix.msh

the input file is passed as the first argument, the output as the second

help is available

meshgen -h

usage: meshgen [-h] [-m {a,w,x,ab,wb,xb}] [-s] [--version] input output

convert between comsol, jcmsuite, and gmsh meshes

positional arguments:
  input                 with extension jcm, mphtxt, or msh
  output                with extension jcm, mphtxt, or msh

options:
  -h, --help            show this help message and exit
  -m, --mode {a,w,x,ab,wb,xb}
                        writing mode (binary only possible for .jcm files)
  -s, --skip_1d         skip writing 1D elements in 2D COMSOL meshes
  --version             show program's version number and exit

alternatively the library can also be used from within python

from meshgen import Mesh
meshes = Mesh.read(args.input)

Since we support submeshes this returns a list of meshes. This behavior will likely change in future versions of meshgen

Known limitations

Currently the following JCM features are not supported:

• curvilinear elements
  • when using a post process to generate a JCM-ASCII export of the grid the displacement field for the curvilinear elements is placed at the end of the file. meshgen is simply going to ignore the curvilinearity.
  • in binary files this doesn't seem to work
• in files that have subgrids we rely on comments in the mesh file to skip extraneous Vertical Grids
  • these comments are not present in binary jcm files -> binary files with subgrids that have Vertical Grids cannot be processed (the processing fails)