Abstract Simulations and experiments at low Reynolds numbers have suggested that skin-friction drag generated by turbulent fluid flow over a surface can be decreased oscillatory motion in the surface, with amount of reduction predicted to decline increasing number. Here, we report direct measurements substantial achieved using spanwise oscillations high friction ( $${{{\mathrm{Re}}}_{\tau }}$$ ...

Riblets are micro-grooves capable of decreasing skin-friction drag, but recent work suggests that additional benefits possible for other components aerodynamic drag. The effect riblets on a fixed-wing, low-speed Unmanned Aerial Vehicle (UAV) the total drag assessed here first time by means RANS simulations. Since microscopic scale precludes their direct representation in geometric model UAV, we...