Self-sustaining processes at all scales in wall-bounded turbulent shear flows

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Title: Self-sustaining processes at all scales in wall-bounded turbulent shear flows
Authors: Cossu, C
Hwang, Y
Item Type: Journal Article
Abstract: We collect and discuss the results of our recent studies which show evidence of the existence of a whole family of self-sustaining motions in wallbounded turbulent shear flows with scales ranging from those of buffer-layer streaks to those of largescale and very-large-scale motions in the outer layer. The statistical and dynamical features of this family of self-sustaining motions, which are associated with streaks and quasi-streamwise vortices, are consistent with those of Townsend’s attached eddies. Motions at each relevant scale are able to sustain themselves in the absence of forcing from larger- or smaller-scale motions by extracting energy from the mean flow via a coherent lift-up effect. The coherent self-sustaining process is embedded in a set of invariant solutions of the filtered Navier-Stokes equations which take into full account the Reynolds stresses associated with the residual smaller-scale motions.
Date of Acceptance: 8-Sep-2016
ISSN: 1364-503X
Publisher: Royal Society, The
Journal / Book Title: Royal Society of London. Philosophical Transactions A. Mathematical, Physical and Engineering Sciences
Copyright Statement: This paper is embargoed until publication.
Sponsor/Funder: Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N019342/1
Keywords: General Science & Technology
MD Multidisciplinary
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Faculty of Engineering

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