> On 19 Aug 2016, at 21:34, andrew <armit...@gmail.com> wrote:
>
> Hi,
>
> I try to create a 3d mesh from an extruded 2d mesh. The mesh is a simple box
> but with cuts in it of zero width. The geometry is created ok and the meshing
> even when I have 2000-3000 cuts is done in less than a few minutes. However
> when I convert the mesh for use with openfoam I was getting errors. By adding
> the command 'Coherence mesh;' after the creation of the mesh, the mesh is
> converted correctly for use with openfoam by using the ultility 'gmshToFoam'.
Indeed, it's a limitation of our extrusion algorithm with embedded curves
("Line In Surface"): it currently creates duplicate vertices. The real fix is
thus for us to enhance extrusion of embedded curves, but it's not trivial due
to the way extruded meshes are generated.
> The problem is in the use of the 'Coherence Mesh'. It takes almost two hours
> to execute while the meshing takes a few minutes. Is there a way to improve
> the Coherence command or to make the same geometry without the duplicate
> nodes that need so much time to be removed?
>
> I attached a file that needs 2.5 minutes on a quad core for meshing and more
> than ten minutes to remove 1600 duplicates.
> I have to create thousands of these meshes so a speedup would be welcomed.
>
That seems a bit slow: on my laptop meshing and duplicate removal take about
the same time (2 minutes each). Which version of Gmsh do you use?
> kind regards
>
> Andrew tsiantis
>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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