[Gmsh] Periodic Surface : bug ?

[francoise.saliou at free.fr]

Hi,

I tried to use the periodic boundary condition with gmsh 2.5 (see attached
helix.geo file)

I obtained a strange result when imposing periodicity between surface 205
(slave) and surface 203 (master) (last line of *.geo file). Did I made a mistake
(bad syntax or anything else ...) or is it a bug?
In the expression-list should the boundary lines of each surface be signed or is
it pointless? (I tried both with same bad result)

Thanks for helping

Francoise

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