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

Venning, J ORCID: 0000-0002-4097-2168, Lo Jacono, D, Burton, D, Thompson, M and Sheridan, J 2017 , '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 , pp. 1-6 , doi: 10.1177/0954407017690683.

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Abstract

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">ReFA√~<span class="mn" id="MathJax-Sp an-14" style="font-family: MathJax_Main;">30,000

Item Type: Article
Authors/Creators:Venning, J and Lo Jacono, D and Burton, D and Thompson, M and Sheridan, J
Keywords: Ahmed body, PIV, vortices
Journal or Publication Title: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Publisher: Sage Publications Ltd.
ISSN: 0954-4070
DOI / ID Number: 10.1177/0954407017690683
Copyright Information:

Copyright 2017 IMechE

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