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Title: The importance of rear pillar geometry on fastback wake structures
Authors: Fuller, Joshua
Passmore, M.A.
Keywords: Wake
Trailing vortices
Davis model
Ahmed model
Issue Date: 2014
Publisher: © Elsevier
Citation: FULLER, J. and PASSMORE, M.A., 2014.The importance of rear pillar geometry on fastback wake structures. Journal of Wind Engineering and Industrial Aerodynamics, 125 pp. 111 - 120.
Abstract: The wake of a fastback type passenger vehicle is characterised by trailing vortices from the rear pillars of the vehicle. These vortices strongly influence all the aerodynamic coefficients. Working at model scale, using two configurations of the Davis model with different rear pillar radii, (sharp edged and 10 mm radius) the flow fields over the rear half of the models were investigated using balance measurements, flow visualisations, surface pressure and PIV (Particle Image Velocimetry) measurements. For a small geometry change between the two models, the changes to the aerodynamic loads and wake flow structures were unexpectedly large with significant differences to the strength and location of the trailing vortices in both the time averaged and unsteady results. The square edged model produced a flow field similar to that found on an Ahmed model with a sub-critical backlight angle. The round edged model produced a flow structure dominated by trailing vortices that mix with the wake behind the base of the model and is weaker. This flow structure was more unsteady than that of the square edged model. Consequently, although both models can be described as having a wake dominated by trailing vortices, there are significant differences to both the steady state and unsteady flow fields that have not been described previously. This also shows that the fastback wake structure described by Ahmed is not definitive.
Description: This is the author’s version of a work that was accepted for publication in Journal of Wind Engineering and Industrial Aerodynamics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Wind Engineering and Industrial Aerodynamics, 125, 2014, DOI: 10.1016/j.jweia.2013.11.002
Version: Accepted for publication
DOI: 10.1016/j.jweia.2013.11.002
URI: https://dspace.lboro.ac.uk/2134/15960
Publisher Link: http://dx.doi.org/10.1016/j.jweia.2013.11.002
ISSN: 0167-6105
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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