On the relationship between manipulated inter-scale phase and energy-efficient turbulent drag reduction
On the relationship between manipulated inter-scale phase and energy-efficient turbulent drag reduction
We investigate the role of inter-scale interactions in the high-Reynolds-number skin-friction drag reduction strategy reported by Marusic et al. ( Nat. Commun. , vol. 12, 2021). The strategy involves imposing relatively low-frequency streamwise travelling waves of spanwise velocity at the wall to actuate the drag generating outer scales. This approach …