I am running GMSH to produce the tet mesh around a closed ended circular
cylinder at 135 degrees angle of incidence to use in a CFD simulation. I use a
STL file to define the cylinder triangular surface. The outer boundary of the
volume is a six faced box.
GMSH produces a tet mesh around the scylinder inside the box but outputs a
message "NN illegal tets are still in the mesh" where NN is a number depending
on the number of triangles in the STL file. How does GMSH decide a tet is an
"illegal tet" ?
For other cases, GMSH also outputs the message "NN points could not be
inserted". NN is again a number. Is there any way to find out why there are
problems with these points and where they are ?
For these, I can send you my STL and GEO files if that will help.
Finally, because I'm trying CFD mesh generation cases, I'm trying to limit the
volume of the mesh to say one half of the body as the problem has a plane of
symmetry. I'm trying to use the Compound Line to define the geometry edge
profile where the profile may be made up of 100 points. Is there any
restriction on the number of points that can make up a compound line ? Even
though its only a cylinder, I need that number of points to get the tets near
to the surface to be quite small to resolve the flow solution.
Any help would be gratefully received.
Many thanks
Steve Daley
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