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The nature of the vortical structures in the near wake of the Ahmed body


Venning, J and Lo Jacono, D and Burton, D and Thompson, M and Sheridan, J, The nature of the vortical structures in the near wake of the Ahmed body, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 231, (9) pp. 1239-1244. ISSN 0954-4070 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 IMechE

DOI: doi:10.1177/0954407017690683


This study presents the results from high-spatial-resolution water-channel velocity-field measurements behind an Ahmed body with 25 rear slant angle. The Ahmed body represents a simplified generic model of a hatchback automobile that has been widely used to study near-wake flow dynamics. The results help clarify the unresolved question of whether the time-mean near-wake flow structure is topologically equivalent to a toroidal vortex or better described by a pair of horizontally aligned horseshoe vortices, with their legs pointing downstream. The velocimetry data presented allows the tracking of the vortical structures throughout the near wake through a set of orthogonal planes, as well as the measurement of their circulation. The spanwise vortices that form as the flow separates from the top and bottom rear edges are shown to tilt downstream at the sides of the body, while no evidence is found of a time-mean attached toroidal vortex, at least for the Reynolds number (based on the square root of the frontal area) of ReFA~30,000" role="presentation">

Item Details

Item Type:Refereed Article
Keywords:Ahmed body, PIV, vortices
Research Division:Engineering
Research Group:Fluid mechanics and thermal engineering
Research Field:Fluid mechanics and thermal engineering not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Venning, J (Dr James Venning)
ID Code:115601
Year Published:2017
Web of Science® Times Cited:18
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-03-31
Last Modified:2021-10-13

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