[Gmsh] Error : Self intersecting surface mesh, computing intersections

[Berta Beltran]

Hi  all, 

I am trying to emulate this results (see attached figure)  from some previous simulations done with COSMOL Multiphysics for the electric potential of our device. I am creating the geometry and meshing it with Gmsh and then I will use Elmer to calculate the potential and electric fields. 






I have programed a file called small_cell.geo (attached) with a bounding box and 3 perpendicular wires inside. I want to have mirror conditions along the 4 long sides of the box as I will be periodically repeating this cell to make a bigger detector and therefore I need the wires to touch the walls. 

The geometry file seems to be ok if I look at it with Gmsh (see attached file) 













But when I try to mesh this geometry by doing in the command line 

#gmsh small_cell.geo -3 -order 2 

I get the following error 

Error   : Self intersecting surface mesh, computing intersections (this could take a while)



Error   : ------------------------------
Error   : Mesh generation error summary
Error   :     0 warnings
Error   :     1 error
Error   : Check the full log for details
Error   : ------------------------------




If I have a look at the  intersect.pos  file with Gmsh I see that the points where the wires touch the bounding box walls are the problems (see attached figure) 





But as I have mentioned I want the wires to touch the walls so that I can have mirror conditions when I calculate the electric field with Elmer. 

Any suggestion of how can I get right of this error ? 
All my geometry files are attached to this email. 

Thanks in advance 

Berta 



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