Direct numerical simulations are employed to study turbulent friction reduction mechanisms in a turbulent channel flow induced by lateral sinusoidal oscillations of a ribbed wall. An open-channel model with constant flow rate is considered. The results show that the net energy saving is higher than the same quantity in the case of lateral sinusoidal oscillations of a flat wall or in the case of a quiescent ribbed wall. It is assumed to happen due to more effective influence of the ribs on the turbulent generation mechanisms in the near-wall zone.
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