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Using modal decompositions to explain the sudden expansion of the mixing layer in the wake of a groyne in a shallow flow
journal contribution
posted on 2018-06-19, 12:38 authored by J.E. Higham, W. Brevis, Chris KeylockChris Keylock, A. SafarzadehThe sudden expansion of the mixing layer created in the wake of a single groyne is investigated using Particle Image Velocimetry (PIV). In the region of the sudden expansion a patch of high Reynolds shear stresses are observed. Using low-order representations, created from a Dynamic Mode Decomposition and a search criteria based on a Proper Orthogonal Decomposition, the spatio-temporal mechanism of the sudden expansion is investigated. The present study demonstrates the sudden expansion is created by the periodic merging of eddies. These eddies originate from the upstream separation and the tip of the groyne and merge with recirculating eddies created, downstream of the groyne, at the interface of the mixing layer and the lateral wall.
Funding
The first author was supported by a PhD studentship from the UK Natural Environment Research Council (NE/L501682/1). The second author was supported by Engineering and Physical Sciences Research Council (EP-L026457-1). The third author was supported by Royal Academy of Engineering/Leverhulme Trust Senior Research Fellowship (LTSRF1516-12-89).
History
School
- Architecture, Building and Civil Engineering
Published in
Advances in Water ResourcesVolume
107Pages
451 - 459Citation
HIGHAM, J.E. ... et al, 2017. Using modal decompositions to explain the sudden expansion of the mixing layer in the wake of a groyne in a shallow flow. Advances in Water Resources, 107, pp.451-459.Publisher
Elsevier © The AuthorsVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/Acceptance date
2017-05-16Publication date
2017Notes
This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/ISSN
0309-1708Publisher version
Language
- en