[Gmsh] periodic pairs of internal nodes of each edge

[Christophe Geuzaine]

> On 26 Jul 2018, at 08:24, Nan Li <linan88433189 at gmail.com> wrote:
> 
> Hello everyone,
> 
> I am trying to mesh a cross-cavity with high order tetrahedron element (tetrahedron 10) and apply periodic boundary condition in x direction and y direction. As the periodic boundary condition has nothing to do with the cavity,  you can consider the cross-cavity as a cube. 
> 
> I have used 'periodic surfaces' and find the mesh of the two opposite surface is identical. So far so good. Then when I look into the .msh file and try to extract the point pairs in $Periodic $EndPeriodic, I find that only the nodes on the vertex of triangle are listed there. The internal nodes for each edge are not listed. 
> 
> Does anyone have successfully extract the periodic pairs of internal nodes of each edge ?
> 

Indeed we only keep track of the main vertices in the Periodic section. Once you have those you can get the element correspondance and match the high-order ones.

@Koen, Amaury - should we also add the high-order vertices in the correspondance tables ?

Christophe


> Thanks. 
> 
> Nan LI
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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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