Dear Gmsh Development Team,
My
name is George Ntemos and I am a PhD student in the Aeronautics
Department of Imperial College London. Our team is developing and
applying CFD software, using gmsh for high-order meshing purposes. I am currently studying a flow case
around a rod-aerofoil set-up and I've been experiencing some
problems
with high-order meshing. More specifically, the meshing algorithm
fails to mesh in high order around the (spline-defined) aerofoil
profile. Please find attached a lightweight .geo file of my
configuration just for demonstration purposes. If one tries
meshing
this file in 3d and for order > 1, gmsh will warn that, to my
understanding, the algorithm fails to properly converge at certain
points, visibly resulting in quite severe discrepancies for a few
elements (curvilinear on). It also warns that it cannot orient the
normal for the two extruded surfaces of the rod (cylinder)
boundary
layer. It is worth noting here that I am experiencing none of the
above problems when I am meshing in 2d. Since my 3d mesh is just a
simple extrusion, I would assume that extending to 3d is just a
trivial case of translating every operation along the 3rd
dimension. I am of course not particularly experienced in using
gm
The 2D mesh is already wrong as is. If you use the high order tools with the current parameters, this is what it gives :
Info : --- Optimization pass with initial jac. range (-0.528961, 1.76584), jacBar = -0.581857 Info : Reached jacobian (0.148494 1.77654) requirements, setting null gradient Info : Optimization finalized after 11 iterations (41 function evaluations), Info : because gradient norm is no more than EpsG Info : Optimization done Range (0.148494,1.77654) Info : Optimization succeeded Info : Done optimizing high order mesh (278.816 s)
It is quite long indeed (work clearly in progress for boundary layers) but it worked !
JF sh
however and I may very well be missing something here. Any help regarding these issues would
be greatly appreciated. Thank you for your time.
Best regards, George
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------------------------------------------------------------------ Prof. Jean-Francois Remacle Universite catholique de Louvain (UCL) Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering Institute of Mechanics, Materials and Civil Engineering (iMMC) Center for Systems Engineering and Applied Mechanics (CESAME) Tel : +32-10-472352 -- Mobile : +32-473-909930
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rod_aerofoil_3d_light.geo
Description: application/vnd.dynageo
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