AUTHOR=Huang Yi , Fu Song 

TITLE=Reynolds Number Effects on the Drag Reduction With a Spanwise Traveling Wave of Blowing and Suction in Turbulent Channel Flows

JOURNAL=Aerospace Research Communications

VOLUME=Volume 1 - 2023

YEAR=2024

URL=https://www.frontierspartnerships.org/journals/aerospace-research-communications/articles/10.3389/arc.2023.12272

DOI=10.3389/arc.2023.12272

ISSN=2813-6209

ABSTRACT=A spanwise traveling wave of blowing and suction method is applied to reduce the drag in turbulent channel flows with Re τ = 180 and Re τ = 550. The direction of the traveling wave reverses periodically to generate a similar oscillatory spanwise motions as the wall oscillation. Results from direct numerical simualtions (DNS) show that the blowing and suction control can achieve a drag reduction rate of 24.5% with Re τ = 180, while 7.5% with Re τ = 550. The reasons for the deterioration in drag reduction rates are thought to be the lift-up mechanism by the actuation through an asymptotic expansion method, and the controlled inner regions and small-scale structures having less significance when Reynolds number is high.