Turbulent boundary layer: non-dimensionalising is the result024681012051015202530x = 0.20 mx = 0.45 mx = 0.80 mx = 1.30 mvelocity u (m/s)height above wall y (mm)Physical variables: four different profilesx = 0.20 mx = 0.45 mx = 0.80 mx = 1.30 mfree stream11010010000510152025bufferlayeru+ = y+log law (kappa=0.41, B=5.2)y+ = y u_tau / nuu+ = u / u_tauWall units: the same four profiles collapseu+ = y+log law (kappa=0.41, B=5.2)Turbulent boundary layer: non-dimensionalising is the result