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Effects of aspect ratio on the wake dynamics of the Ahmed body


McQueen, T and Venning, J and Sheridan, J, Effects of aspect ratio on the wake dynamics of the Ahmed body, Proceedings of the 19th Australasian Fluid Mechanics Conference, 8-11 December 2014, Melbourne, Australia, pp. 1-4. ISBN 978-0-646-59695-2 (2014) [Refereed Conference Paper]


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Time-Resolved Particle Image Velocimetry (TR-PIV) data was acquired in the wake of Ahmed bodies allowing the effects of varying the aspect ratio on the wake dynamics to be revealed. The spatial structures and energy contained in the dominant wake modes within the frequency spectra were investigated. It was found that a dominant frequency existed in the near wake of all aspect ratio bodies and that this frequency appeared not to be influenced by aspect ratio. This frequency was related to an alternate vertical flapping motion of the C-pillar vortices. The influence of aspect ratio on the corner vortex strength was identified. The formation of a vortex below the C-pillar vortex that appeared dependent on the interaction between the upwash and downwash was also noted.

Item Details

Item Type:Refereed Conference Paper
Keywords:Ahmed body, vehicle aerodynamics, vortex flow, PIV, dynamics
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:115604
Year Published:2014
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-03-31
Last Modified:2018-04-05
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