[Gmsh] Difficulty with generating a volume mesh from a stl file
gdmcbain at freeshell.org
Fri May 29 02:00:55 CEST 2015
2015-05-28 20:09 GMT+10:00 David Love <dml42 at cam.ac.uk>:
> Dear Geordie,
> Thank you very much for your reply.
> You are right, GMSH does not generate zero volume tetrahedra. I think the
> issues with the finite element simulations are due to a combination of my
> Matlab script and GMSH's volume meshing routine. When loading the volume
> mesh into COMSOL a minimum quality factor of 6E-10 (average quality 0.66) is
> obtained, which is rather poor.
Thanks for updating on your progress and clarifying the difficulty.
I see that the latter is poor tetrahedra rather than completely flat
ones. Since last writing, I remembered the advice of M. Z. to another
query on this list earlier this month: -optimize.
I passed this option to Gmsh on the command-line
$ gmsh -3 -optimize -format mesh -string "Mesh.SaveElementTagType=2;"
and checked the resulting .mesh files by opening them in the Gmsh GUI
and inspecting the last three fields in the Tools/Statistics panel:
SICN, Gamma, and Rho. The minima of these over the mesh seem to have
lifted quite a bit which I assume (without going into details) imply a
Perhaps -optimize or -optimize_netgen would help in your problem too.
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