[nguyenpt]

Hi all,

I have read a paper with title "A strictly conservative Cartesian cut-cell method for compressible viscous flows on adaptive grids", authors: Daniel Hartmann, Matthias Meinke, Wolfgang Schröder.

link: https://docs.google.com/viewer?a=v&p...RkNTcwN2FjZGI2


part 4.2.2 "Wall-shear stress computation", they said using the Gram-Schmidt orthogonalization to find unit vectors e_eta^n and e_zeta^n, but I don't understand how to find two vector in general as you said.

If possible, you can show me how to find, or answers of these two vectors.

Thank you!