[Gmsh] Sub region meshing

[Christophe Geuzaine]

Yves Capdeboscq wrote:
> Dear Gmsh users,
> 
> How does one impose create sub-regions consistently?
> 
> I want to mesh a Ball, say of radius one, and imagine the subregion of
> interest is a smaller ball of radius 1/10. I can ask gmsh to msh them
> properly, by putting a - sign on all the surfaces corresponding to a
> smaller ball.
> 
> Now, I now that i do not need a fine mesh everywhere outside my small
> ball, only within the ball of radius 2/10. So I have three nested balls,
> with only two physical regions.
> 
> My question is: what is the correct orientation to choose for each of
> the surfaces?
> 

Hi Yves - Any orientation will do: it's the number of surface loops that 
will determine how many holes you have in a volume. (Or maybe I did not 
understand your question?)

> Thanks
> 
> Yves
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine