The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2018
Session ID : OS1-3
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Reynolds number effect of drag reduction in turbulent channel flow using traveling wave-like wall deformation
*Yusuke NABAEKen KAWAIKoji FUKAGATA
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Abstract

We perform direct numerical simulation of turbulent channel flow with traveling wave-like wall deformation at three different friction Reynolds numbers, Reτ = 90, 180, and 360. It is found that the set of control parameters in the maximum drag reduction case is same in wall units: there is little Reynolds number dependency in the mean velocity profiles under this set of control parameters. Based on this scaling, we propose a semi-empirical formula for the mean velocity profile to predict the drag reduction rate at higher Reynolds numbers. Using the proposed formula, it is revealed that about 40% drag reduction effect can be attained even at practically high Reynolds numbers, Reτ ~ 105 − 106.

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© 2018 The Japan Society of Mechanical Engineers
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