> On 4 Apr 2019, at 18:03, Abiti Adili <[email protected]> wrote:
>
> I have a tetrahedral mesh over a unit box that has two balls of different
> sizes inside the box. The geometry is created by geometrycloser.geo, and the
> physical entities and such were created by importing geometrycloser.geo into
> omnibuscloser.geo.
>
> I have a periodicity condition to impose where I need to say that
> 1) right side of the box is the same with left side
> 2) top side is the same with bottom side
> 3) front side is the same with the back side
>
> When I tried to make the system matrices periodic using a function that has
> been tested on other examples, it did not work correctly and I have
> concluded that either vertices or facets on the sides of the box may not have
> been aligned.
>
> I am writing to ask if there is anyway that I can modify the geo files I
> provided so that I can integrate the periodicity condition into the mesh I
> make? Thank you very much.
>
You need to explicitly tell Gmsh that the meshes should be periodic. In your
example, add
Periodic Surface{5} = {6} Translate {1,0,0};
Periodic Surface{2} = {4} Translate {0,1,0};
Periodic Surface{1} = {3} Translate {0,0,1};
at the end of the geo file.
Christophe
>
> Adil<geometrycloser.geo><omnibuscloser.geo>_______________________________________________
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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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