Hi everyone,
I was wondering are there any mesh smoothing options in Netgen? If so, what do they do (Laplace smoothing ?)
Is there a way to access them via the Python interface?
Best,
Umberto
Hi Umberto,
there is
Mesh.OptimizeMesh2d`
and
Mesh.OptimizeVolumeMesh
for the netgenMesh. The argument MeshingParameters has strings optimize2d and optimze3d, which specify a sequence of optimization steps.
There is smoothing (which optimizes mesh quality), and topological optimization like swapping, point collapsing, or point insertion.
It is already explained in the original Netgen paper, I think.
Joachim
Thank you! Indeed I found this also described in the original netgen paper.
From the docs I see the options used are â€ścmdmustmâ€ť but I canâ€™t find the meaning of â€śuâ€ť and â€śtâ€ť.
 optimize3d: str = "cmdmustm"
 3d optimization strategy:
 m .. move nodes
 M .. move nodes, cheap functional
 s .. swap faces
 c .. combine elements
 d .. divide elements
 p .. plot, no pause
 P .. plot, Pause
 h .. Histogramm, no pause
 H .. Histogramm, pause

 optsteps3d: int = 3
 Number of 3d optimization steps.

 optimize2d: str = "smcmSmcmSmcm"
 2d optimization strategy:
 s .. swap, opt 6 lines/node
 S .. swap, optimal elements
 m .. move nodes
 p .. plot, no pause
 P .. plot, pause
 c .. combine
t
is now the same as capital D
SplitImprove2
: Split two opposite edges of very flat tet and let all 4 new segments have one common vertex
u
doesnâ€™t do anything right now (commented out) it was a step to swapimprove the surface in between. But already out before 2009 (since we donâ€™t change the surface mesh in volume meshing any more)