[Gmsh] add a local volume group in GMSH

[zhaoguang wang]

Hello all,
Now I am using GMSH for meshing a model.
I am wondering how to define a local volume group. As I have a CAD model and
I want to define a local volume from one part of it!

When I use the command "add physical volume group", there is just one
volume.

So, my question is that  how to define local volume using some local points
and lines??

Inclosure please find the CDA model (STEP format) and the picture showing
the area ofl ocal volume I want to define!!

Regards

-- 
zhaoguang.w at gmail.com
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