Investigation on Spanwise Wall Oscillation in Turbulent Channel Flow Based on Reynolds Stress Model (RSM)

A variety of studies have showed that wall oscillation contributes much to skin-friction drag reduction, however, the mechanism of drag reduction has not been fully understood. In this paper, one of the common wall-bounded turbulent flows to simulate is the fully developed turbulent flow in a plane channel. Based on the RSM, the numerical simulation results of the distribution among different components of Reynolds stresses are obtained under the action ofoscillation or not, respectively. It is found that wall oscillation suppresses turbulent intensity and leads to skin-friction drag reduction, because of the significant role played by the pressure-strain term.