[Gmsh] Air volume arround a 3D model.

[Javier Sánchez Buezas]

Hello all. 

I'm trying to simulate the ElectroMagnetic behaviour of a Microstrip
antenna on a PCB board. In order to make a simple start I tried to
simulate a simple strip of cooper, and placing it inside an spherical
box of air. 

The problem is that the mesh doesn't generates correctlly. If I try with
the Delauny algorithm I get the "Self intersecting surface mesh" error.
If I use the Frontal algorithm no 3d mesh is generated for the air. 

I created the model by defining the outter surface and a surface loop of
all the outter surfaces of the board and then making a volume with thos
2 arguments ( Volume(n) = {Spherical surface, surface loop};) 

Attached is the .geo file. 

Any idea of how can I make this right? 

Greetings. 

Javier.
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