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Evaluating tangential derivatives on patch

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Old   March 25, 2009, 11:13
Default Evaluating tangential derivatives on patch
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Edoardo Gonfiotti
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Hi, I'm implementing non reflecting boundary condition for compressible LES calculations. In particular I'm interested in LODI boundary conditions (see Ref: Poinsot and Lele, Boundary conditions for direct simulation of compressible viscous flows).
In the first step I was tring to implement a partially non reflecting outlet and I'm facing these two major problems:
  1. How could I evaluate normal derivative of a tangential component of velocity on a boundary?
  2. How could I evaluate directional derivative of a variable on a boundary (direction tangential to the boundary)?
I looked in the boundary condtions library, but I didn't find anything helpful for my case. Any help or suggestion would be really appreciated. Thanks in advance.
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