= Van Driest' wall damping factor (variables are evaluated at the wall values) = angle of attack we 1 dwe ^f , = — , — —— , Mach number ue ue dB = mixing length = (x/d) (dd/dx) = Prandtl number = Reynolds number per unit length, cm ~ ! = dimensionless temperature = dimensionless components of velocity along the x,y, and 6 directions = coordinates, 6 = sin0c = k' w/u, streamline direction = ratio of specific heats = (1 + 5.5rj) ~ l , intermittency factor = boundary-layer thickness