[Gmsh] Sub region meshing

[Yves Capdeboscq]

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?

Thanks

Yves

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