[Gmsh] [Fwd: Re: SPAM Re: Conformal mesh on two parts]

[Theler German Guillermo]

Besides using brep/step instead of stl, did you try not to have a hollow
big-cube containter to start with but to have gmsh to carve the hole?

See my 2 stls and the geo file.

This idea should work also for non-planar surfaces.

--
Germán Theler :: CTO Ingeniería & TICs

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On Thu, 2016-01-07 at 12:13 +0100, Bernd Hahnebach wrote:
> 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 <kbzowski at agh.edu.pl>:
>
> > 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
> >
> > _______________________________________________
> > gmsh mailing list
> > gmsh at onelab.info
> > http://onelab.info/mailman/listinfo/gmsh
> >
>
>
>
>
>
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