Modelling and feedback control of vortex shedding for drag reduction of a turbulent bluff body wake

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Title: Modelling and feedback control of vortex shedding for drag reduction of a turbulent bluff body wake
Authors: Brackston, RD
Wynn, A
Morrison, JF
Item Type: Journal Article
Abstract: Three-dimensional bluff body wakes are of key importance due to their relevance to the automotive industry. Such wakes have both large pressure drag and a number of coherent flow structures associated with them. Depending on the geometry, these structures may include both a bistability resulting from a spatial symmetry breaking (SB), and a quasi-periodic vortex shedding. The authors have recently shown that the bistability may be modelled by a Langevin equation and that this model enables the design of a feedback control strategy that efficiently reduces the drag through suppression of asymmetry. In this work the stochastic modelling approach is extended to the vortex shedding, capturing qualitatively both the forced and unforced behaviour. A control strategy is then presented that makes use of the frequency response of the wake, and aims to reduce the measured fluctuations associated with the vortex shedding. The strategy proves to be effective at suppressing fluctuations within specific frequency ranges but, due to amplification of disturbances at other frequencies, is unable to give drag reduction.
Issue Date: 6-Apr-2018
Date of Acceptance: 13-Mar-2018
URI: http://hdl.handle.net/10044/1/58658
DOI: https://dx.doi.org/10.1016/j.ijheatfluidflow.2018.03.015
ISSN: 0142-727X
Publisher: Elsevier
Start Page: 127
End Page: 136
Journal / Book Title: International Journal of Heat and Fluid Flow
Volume: 71
Copyright Statement: © 2018 Elsevier Inc. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: 0901 Aerospace Engineering
0913 Mechanical Engineering
0915 Interdisciplinary Engineering
Mechanical Engineering & Transports
Publication Status: Published
Appears in Collections:Aeronautics
Faculty of Natural Sciences



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