Multi-scale interactions in a compressible boundary layer
File(s)
Accepted version
Author(s)
Agostini, L
Leschziner, M
Poggie, J
Bisek, NJ
Gaitonde, D
Type
Journal Article
Abstract
The properties of spectral subranges of scales in a boundary layer at Mach=2.3 and friction Reynolds number Reτ = 570 are investigated by analysing DNS data. One major aim is to examine whether footprinting and modulation of small-scale near-wall motions by outer large structures, observed at high Reynolds numbers, also pertain to this low-Reynolds-number case, or whether the logarithmic layer simply contains a continuous hierarchy of motions without specific outer scales playing a distinctive role. To this end, the spectrum of scales is decomposed into modes by application of the “Empirical Mode Decomposition”. The properties of different scales are then investigated by means of spectra, maps of isotropy/anisotropy parameters, the premultiplied derivative of the second-order structure function, correlation coefficients and joint probability density function (PDF), the last constructed from conditionally sampled data for the small-scale motions within the large-scale footprints. A clear commonality is identified between interactions in high-Reynolds-number channel flow and the present low-Reynolds-number boundary layer.
Date Issued
2017-05-23
Date Acceptance
2017-04-21
Citation
Journal of Turbulence, 2017, 18 (8), pp.760-780
ISSN
1468-5248
Publisher
Taylor & Francis
Start Page
760
End Page
780
Journal / Book Title
Journal of Turbulence
Volume
18
Issue
8
Copyright Statement
© 2017 Informa UK Limited, trading as Taylor & Francis Group
Sponsor
Commission of the European Communities
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000404261500002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
690623
Subjects
Science & Technology
Technology
Physical Sciences
Mechanics
Physics, Fluids & Plasmas
Physics
Turbulent boundary layers
EMPIRICAL MODE DECOMPOSITION
WALL PIPE-FLOW
AMPLITUDE-MODULATION
LOGARITHMIC REGION
REYNOLDS-NUMBERS
SCALE STRUCTURES
TURBULENCE
Publication Status
Published