Geometries are stored in STL files. From CAD point of view, one file contains an internal cube, another contains cube with a hole for an internal cube. All dimensions fits (there are no intersections). My task is to create a conformal tetrahedral mesh suitable for mechanical FEM analysis - without duplicated nodes on shared faces. Each element should contain information to which part it belongs. File format does not matter but Abaqus is preferred.
I decided to use gmsh, but I cannot mesh both parts together. I tried the following commands:
- File -> Open Internal cube
- Add volume to internal cube
- File -> Merge External cube
- Add volume to external cube
This produces mesh but elements in internal cube are duplicated. It looks like gmsh does not treat hole (in external cube) as a void. I also tried to use Coherence in gmsh but it failed with error:
Error : Self intersecting surface mesh, computing intersections (this could take a while)
Error : Surface mesh is wrong, cannot do the 3D mesh
I assume, that my geometries are fine:
How to create such a mesh which satisfy my requirements?