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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

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posted on 19.06.2018, 12:38 authored by J.E. Higham, W. Brevis, Chris KeylockChris Keylock, A. Safarzadeh
The 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 Resources

Volume

107

Pages

451 - 459

Citation

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 Authors

Version

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

16/05/2017

Publication date

2017

Notes

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

0309-1708

Language

en