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Friction-Drag Reduction by Transverse Wall Motion – A Review

Published online by Cambridge University Press:  25 August 2020

Michael A. Leschziner*
Affiliation:
Imperial College London
*
*Corresponding author (M. A. Leschziner, mike.leschziner@ic.ac.uk)
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Abstract

The quest for drag reduction is driven by environmental concerns, in general, and the need to reduce fuel consumption in transport applications, in particular. Turbulent friction is especially important in civil aviation, accounting for over 50% of the total drag in cruise. In this context, spatially and/or temporally varying in-plane wall motion, while undoubtedly difficult to implement in practice, has attracted major interest, because of the large drag-reduction margins it yields. It is also a forcing method that is of fundamental interest, as it provokes intriguing interactions between the spanwise Stokes layer induced by the wall motion and the near-wall turbulence-regeneration mechanisms. This article provides a relatively brief, ‘entry-level’, review of research in this area, principally over the past two decades. While far from being exhaustive, the review conveys a reasonably detailed picture of some major physical issues as well as of the outcome of the most important computational and experimental studies. Particular emphasis is placed on the question of how results obtained in idealised laboratory conditions and by simulation at relatively low Reynolds-number values pertain to high values typical of high-speed transport.

Type
Research Article
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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