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The effect of aspect ratio on the wake of the Ahmed body


Venning, J and Lo Jacono, D and Burton, D and Thompson, M and Sheridan, J, The effect of aspect ratio on the wake of the Ahmed body, Experiments in Fluids, 56, (6) Article 126. ISSN 0723-4864 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/s00348-015-1996-5


This paper seeks to further elucidate the wake of the Ahmed body by investigating how the time-averaged flow structures vary with frontal aspect ratio. High-resolution particle image velocimetry results are provided for eight different width Ahmed geometries at ReFA√=3104. It is shown that the narrower the body, the greater the downwash over the back slant, meaning the flow remains more attached. At a critical aspect ratio (AR=1.9), the flow downstream changes. The separation over the back slant is shown to be affected by the AR, and this in turn has a significant effect on the circulation in the c-pillar vortices.

Item Details

Item Type:Refereed Article
Keywords:vehicle aerodynamics, vortex structures, velocimetry
Research Division:Engineering
Research Group:Fluid mechanics and thermal engineering
Research Field:Aerodynamics (excl. hypersonic aerodynamics)
Objective Division:Energy
Objective Group:Energy efficiency
Objective Field:Transport energy efficiency
UTAS Author:Venning, J (Dr James Venning)
ID Code:113510
Year Published:2015
Web of Science® Times Cited:28
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-01-05
Last Modified:2017-11-03

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