Abstract
An experimental study has been performed on the similarity of the Reynolds stress profiles for smooth- and rough-wall turbulent boundary layers under zero-pressure-gradient. The new scale of turbulent momentum flux was defined with considering both wall shear stress and mean flow momentum flux coming from the slope of mean streamline. Then, the wall shear stress was determined by direct measurement with a floating element device. The Reynolds stress profiles, normalized with the new scale, for the smooth- and rough-wall turbulent boundary layer at high Reynolds number almost collapse on a single curve.
