[Gmsh] Weird error (literally)
John.Villarrubia at nist.gov
Tue Jul 7 15:43:56 CEST 2015
While attempting to Optimize 3D, GMSH says "Impossible to swap face" and
then "Error: WEIRD !!!" I'm at a loss concerning how to trouble shoot.
I'm attempting to mesh a rough surface. To this end I have in another
software generated a random roughness (which matches a desired power
spectrum) and wrapped this rough "skin" around a smooth basic shape. My
other software generates a .geo file that consists of surface points
specified on a rectangular grid at close intervals, together with edges
and triangular surfaces that comprise a triangulation of this grid. My
triangles in the .geo are smaller than GMSH's mesh size, so when I tell
GMSH to do a surface mesh of this, it is essentially constrained to use
the triangles I have given it. I close the volume by providing sides and
a bottom surface, and I want GMSH to then produce the associated 3D mesh
of the enclosed volume.
At first I tried no mesh size specification (so let GMSH do it's default
thing). This produces a large number of "Impossible to smooth vertex"
errors. It nevertheless produces a 3D mesh. However, this mesh is faulty
(e.g., contains at least one instance of one tetrahedron inside of another).
Then I tried specifying mesh size equal to my triangle edge length for
nodes in my rough region and equal to the approximate dimension of my
volume at points far from the surface. GMSH at first locked up and had
to be manually terminated after several days of CPU usage. Thinking this
may be due to excessive mesh size, I've pared it down.
It produced a 3D mesh, but when I tried to optimize I got the
above-mentioned "Impossible to swap face" and then "Error: WEIRD !!!"
messages followed by a pop-up from the operating system: "GMSH has
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