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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/36533

Title: Low-frequency wake dynamics for a square-back vehicle with side trailing edge tapers
Authors: Pavia, Giancarlo
Passmore, Martin A.
Varney, Max
Keywords: Bluff body aerodynamics
Wake dynamics
Wake bi-stability
Issue Date: 2019
Publisher: © Elsevier BV
Citation: PAVIA, G., PASSMORE, M.A. and VARNEY, M., 2019. Low-frequency wake dynamics for a square-back vehicle with side trailing edge tapers. Journal of Wind Engineering and Industrial Aerodynamics, 184 pp. 417 - 435.
Abstract: In this paper, the effects of side trailing edge tapering on the wake of a simplified square-back vehicle are investigated. The tapered surfaces are reported to trigger a switch from a laterally asymmetric bi-stable wake to a vertically asymmetric stable wake. The wake structure reported in the literature for lateral symmetry breaking states is seen to rotate by 90◦ as the angle of the tapered surfaces φs is increased. A 6% drag reduction over the simple square-back case is reported for 6◦ < φs < 12◦ . This gain is found to be the result of the stretching of the circular vortex responsible for the suction zone visible in any symmetry breaking state. A downwash dominated wake is observed in these conditions. The sensitivity of such a wake to small variations of the model pitch angle (for φs = 12◦ ) is also assessed. As the pitch angle α is reduced from 0◦ to −2 ◦ , the time averaged wake is reported to switch from a downwash dominated topology to an upwash dominated topology. A strengthening of the long-time instability is observed when the symmetry in the vertical direction is recovered and is accompanied with a 4.9% reduction in base drag over the same model tested at α = 0
Description: This paper is in closed access until 20th Dec 2019
Sponsor: The authors would like to thank Jaguar Land Rover for their financial support.
Version: Accepted for publication
DOI: 10.1016/j.jweia.2018.12.009
URI: https://dspace.lboro.ac.uk/2134/36533
Publisher Link: https://doi.org/10.1016/j.jweia.2018.12.009
ISSN: 0167-6105
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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