[Gmsh] periodic BCs

Christophe Geuzaine cgeuzaine at ulg.ac.be
Tue Jun 2 16:20:41 CEST 2009

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
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