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LDTalbot edited this page Jul 8, 2022 · 7 revisions

For pre-processing, you may use the meshing software 'Gmsh' (Geuzaine & Remacle, 2022). The Gmsh software can be found here.

Pre-Processing For Tetrahedral Mesh

  • A sample Gmsh input file, which will create tetrahedral mesh within a hexahedral bounding box, can be found here.
    • The program will output a .msh file.
    • Note that this .msh file cannot be directly used as an input in MPM: it must be converted.
    • When converting, note that the Gmsh nodal numbering convention is to start at 1, while the MPM convention is to start at 0.
  • A sample Gmsh output conversion program, compatible with tetrahedral mesh within a hexahedral bounding box and the input file mentioned above, can be found here.
    • The conversion program will take a Gmsh output file and convert it to MPM input files.
    • Note that the .msh must be saved to a .csv before using the converter.
    • The following MPM input files will be created:
      • Mesh file (eg. mesh.txt).
      • Entity file (eg. entity_sets.json). Creates a nodal set for each surface of the mesh bounding box.
      • Velocity constraints file (eg. velocity_constraints.txt). Requires inputs of the desired velocity per direction, and per surface of the bounding box.

References

  • Geuzaine, C., & Remacle, J. F. (2022). Gmsh (4.9.5) [Computer software]. https://gmsh.info/