[Gmsh] Create a Boundary Layer around a blade

[Javier de la Sierra]

I attach the images:

   1. 2D airfoil with OK BL (whitcomb2.geo, attached in previous message)
   2. Detail of BL in 3D wing (ala.geo, attached in previous message)
   3. General view of 3D wing mesh, with weird mesh (ala.geo, attached in 
   previous message)

Sorry for posting 3 messages, but i had problems with images in first 
message.

Thanks for your help.
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