[Gmsh] periodic BCs

[Christophe Geuzaine]

Danny Holstein wrote:
> All;
> 
> Let me try again.  How difficult would it be to modify GMSH to create a "Periodic Plane"?  Either a boolean switch could be set while doing a translate/rotate or the 2 planes could be grouped as a physical entity, which would be 2-D meshed once with the mesh elements copied to it's "periodic" brother.
> 
> Certainly, many problems have 180 degree rotational symmetry, and many RF devices (such as helix and coupled cavity TWTs and klystrons) have axial symmetry, magnetrons/CFAs have rotational symmetry to the vanes.  Mechanical structures with spokes would be greatly simplified with this symmetry.
> 
> It seems the switch used with a new "Periodic Plane" would be best, the translation matrix could be stored on generation and used immediately after mesh generation.
> 

Hi Danny - Here's a little example on how you could do this using 
extruded meshes.



> Thoughts?
> 
>    ...Dan
> 
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> 


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