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-   -   Evaluating tangential derivatives on patch (http://www.cfd-online.com/Forums/openfoam-solving/63001-evaluating-tangential-derivatives-patch.html)

Edoardo Gonfiotti March 25, 2009 11:13

Evaluating tangential derivatives on patch
 
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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