I'm not familar in working with stl. I mostly work with step. The
following has been working for very well, but for planar faces only !
in FreeCAD but possible in the CAD you prefere as well ...
- import the stl files --> convert the mesh into solids
- make a compound out ouf the solids
- export the compound to step
in GMSH
- open the compound step
- GMSH Tools --> Options --> Geometry --> General --> Cut and merge
faces (-string "Geometry.OCCConnectFaces = 1;")
- Mesh 3D
- ...
Bernd
Zitat von Krzysztof Bzowski <[email protected]>:
Hi,
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.
http://i.stack.imgur.com/h87gD.png
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?
Best regards,
Krzysztof
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