[Gmsh] Creating a cylinder with a hole

[Orhan Shibliyev]

Hi all

 

I am trying to create a cylinder (with a hole) made up of two parts. Without
extrusion, when it is meshed 2D, everything is OK however, when I extrude
one of the surfaces, other half becomes deleted. Does not matter which half
extruded first, the result is not what I want. I attached the geo file.

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