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Re: [ff3d-users] Extraction of the unit normal vector, or normal/tangent

From: Mykola Tasinkevych
Subject: Re: [ff3d-users] Extraction of the unit normal vector, or normal/tangential derivatives.
Date: Tue, 21 Oct 2008 12:08:11 +0200

      Dear St├ęphane,

  thank you for your advise! 

  As I understand, your penalty term is forcing the  flow field "u" only to be parallel to the surface of obstacle, but 
 does not prescribe a specific slip,  "u = slip on [ref] ", where
slip  is some  function.

  One, in principle, can  also penalize the
variational formula in order to impose
         u = slip 
on the boundary.   Is it also possible to  impose this condition rigidly, as a boundary

   Thank you in advance, and
   the best regards,

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