Friction-drag reduction by transverse wall motion - a review
File(s)
Accepted version
Author(s)
Leschziner, Michael A
Type
Journal Article
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.
Date Issued
2020-10-01
Date Acceptance
2020-08-01
Citation
Journal of Mechanics, 2020, 36 (5), pp.649-663
ISSN
1680-0893
Publisher
Cambridge University Press
Start Page
649
End Page
663
Journal / Book Title
Journal of Mechanics
Volume
36
Issue
5
Copyright Statement
© 2020 The Society of Theoretical and Applied Mechanics. This article has been published in a revised form in Journal of Mechanics https://doi.org/10.1017/jmech.2020.31. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000576159000006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Mechanics
Wall friction
turbulent drag
oscillatory wall motion
flow control
TURBULENT-BOUNDARY-LAYER
DIRECT NUMERICAL-SIMULATION
REYNOLDS-NUMBER DEPENDENCE
SKIN-FRICTION
CHANNEL FLOW
OSCILLATIONS
STATISTICS
VELOCITY
Publication Status
Published
Article Number
PII S1727719120000313
Date Publish Online
2020-08-25