Bonjour Alexis,
I had the same problem a few weeks ago (however, I am using Getdp). I guess freefem++ also needs identical surface meshes when periodic conditions are at stake. Basically, you have 2 options to generate identic meshes on periodic surfaces. 1- structured meshes : please see the .geo file attached to http://www.geuz.org/pipermail/gmsh/2010/005259.html 2- Extrude geometry + mesh and delete the aditionnal entries manually : please refer to the attached.geo in http://www.geuz.org/pipermail/gmsh/2010/005312.html for a minimal working example. Depending on the physics you're dealing with, you can to use 1- or 2- (BTW, what kind of problem are you trying to solve with freefem++?). I am solving a vector Helmholtz equation with quasi-periodic conditions and 2- is way more adapted (at least with getdp : I still don't understand why the 1- doesn't work at all in my case). Best, Guillaume Demsy On Wed, 17 Mar 2010 15:49:58 +0100, Alexis Blasselle wrote: Dear all, I begin by thanking you for all the work on Gmsh, which is very impressive. I generate a 3d mesh with the attached file .geo. I can load it with a Finite Element solver named FreeFem++, but do not succeed to define periodic finite elements space on my weird cube: I have the following error message "the both number of face is not the same " How can I fix this, and impose the same elements on the symmetric sides of the cube ? I thank you very much in advance for all piece of advise you could give me, Best regards, Alex -- http://www.ann.jussieu.fr/~blasselle/ [1] Links: ------ [1] http://www.ann.jussieu.fr/~blasselle/
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