[Gmsh] Gmsh - High order node misplaced

[Christophe Geuzaine]

Anthony - Can you try with a recent snapshot? This might have been fixed.

CG

> On 9 Jan 2018, at 00:06, Anthony Gee <Z1620495 at students.niu.edu> wrote:
> 
> Hello,
> 
> I'm Anthony Gee. I am using gmsh 3.0.6 to generate nodes for high order interpolation. I found some odd behavior when meshing a sphere with cubic and higher 2D elements. I can only observe this from the exported .msh file with ASCII 2.0. Somehow, one or more of the elements include an internal node that should be in a different element. I've attached a picture of one such element. The blue points are the nodes of one element from the .msh file for a sphere with ~8000 cubic elements. The orange point is the central node and shows the misplaced node for that element. I have observed this with higher order and more elements but lower order or less elements seems ok.
> 
> I'm not sure why this occurs or whether it shows up in other structures. I could not find a fix in the geometry or meshing options. I've attached my .geo and .msh file. For this case, I generated the 2D mesh and only used refine by splitting command a few times to get 8192 triangles. Please let me know if I made a mistake somewhere. Thank you.
> 
> Anthony Gee
> <gmshcheck.jpg><sphere.geo.opt><sphere.geo><sphere.msh>_______________________________________________
> gmsh mailing list
> gmsh at onelab.info
> http://onelab.info/mailman/listinfo/gmsh

-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Free software: http://gmsh.info | http://getdp.info | http://onelab.info