Abstract
Direct Numerical Simulation (DNS) of turbulent channel flows at moderately high values of the Reynolds number (Re) are performed to examine how Re affects the capabilities of wall-based spanwise-forcing techniques to achieve turbulent skin-friction drag reduction. With the present new data, a relationship could be derived and validated, which predicts the amount of drag reduction at several values of Re. The present study shows that a drag reduction of nearly 30 % would still be possible for an airplane at flight Reynolds numbers thanks to the spanwise forcing.
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