[Gmsh] Conformal mesh on two parts
kbzowski at agh.edu.pl
Thu Jan 7 08:09:19 CET 2016
I have two parts, which need to be meshed. One part is located inside
another. To simplify the problem, imagine two cubes: one inside another.
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:
1. File -> Open Internal cube
2. Add volume to internal cube
3. File -> Merge External cube
4. 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:
- Internal cube: http://pastie.org/10673562
- External cube: http://pastie.org/10673564
How to create such a mesh which satisfy my requirements?
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