[Gmsh] Periodicity at the boundary of a box

[Christophe Geuzaine]

> On 21 Jan 2020, at 14:14, Rohracker, Maurice <mau.rohracker at fau.de> wrote:
> 
> Dear GMSH developer and user,
> 
> for a HiWi job at the FAU Erlangen-Nürnberg we're using GMSH in PYTHON for meshing representative elementary volume (RVEs).
> 
> Therefore we have a box (2D) with circular inclusions. For the following FE simulation, we need periodicity at the boundary.
> 
> I was trying to use:     gmsh.model.mesh.setPeriodic(dim=2, [rveLine1], [rveLine3], affineTransform)
> with an affine transform matrix np.array(([1., 0., 0., 0.,
>                                           0., 1. 0., 0.,
>                                           0., 0., 1., 0.,
>                                           0., 0., 0., 1.]), float)
> 
> Or is it a good approach setting each point on the boundary to handle the desired number of elements on the boundary by oneself?
> 
> Could you help me set up the affine transform matrix (is there an example?) or are there any other and better way to get periodicity at the boundary?
> 

See https://gitlab.onelab.info/gmsh/gmsh/blob/master/demos/api/periodic.py

Christophe

> Thanks a lot for your support in advance.
> 
> Kind regards,
> Maurice Rohracker
> Master Student Computational Engineering FAU Erlangen-Nürnberg
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine