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- W2969379618 abstract "Wall-resolved large-eddy simulations are performed to study the impact of spanwise traveling transversal surface waves in zero-pressure gradient turbulent boundary layer flow. Eighty variations of wavelength, period, and amplitude of the space- and time-dependent sinusoidal wall motion are considered for a boundary layer at a momentum thickness based Reynolds number of $Re_theta = 1000$. The results show a strong decrease of friction drag of up to $26,%$ and considerable net power saving of up to $10,%$. However, the highest net power saving does not occur at the maximum drag reduction. The drag reduction is modeled as a function of the actuation parameters by support vector regression using the LES data. A substantial attenuation of the near-wall turbulence intensity and especially a weakening of the near-wall velocity streaks are observed. Similarities between the current actuation technique and the method of a spanwise oscillating wall without any normal surface deflection are reported. In particular, the generation of a directional spanwise oscillating Stokes layer is found to be related to skin-friction reduction." @default.
- W2969379618 created "2019-08-29" @default.
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- W2969379618 date "2019-08-26" @default.
- W2969379618 modified "2023-09-27" @default.
- W2969379618 title "Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow" @default.
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