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On the wake of an isolated rotating wheel: An experimental and numerical investigation

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journal contribution
posted on 2022-07-07, 09:43 authored by Dipesh Patel, Andrew GarmoryAndrew Garmory, Martin Passmore

The wake of an isolated, rotating wheel of a geometry typical of those used in open-wheel motorsport, is investigated. The CFD is validated by comparing the wake data gathered from this method with the data from the PIV wind tunnel experiments, where analysis of the data showed a good agreement between the two methods. A comparison of the mean and instantaneous flow-fields obtained from the CFD shows significant differences in the wake topology. The time-averaged illustration of the flow shows an inverted “T” shape, and consists of a pair of upper and lower counter-rotating vortices that merge downstream, with the upper being dominant. The instantaneous wake follows the same fundamental shape, but consists of incoherent macro-scale eddies, together with these counter-rotating vortices in a deformed state. Analysis of the unsteadiness of the wake via proper orthogonal decomposition reveals significant transverse and vertical velocity fluctuations. The transverse velocity fluctuations are driven by both the contraction and expansion of the contact patch wake and the instability of the merged counter-rotating vortex pair that eventually lead to a transverse flapping motion of the bulk wake.

The instability of these vortices also leads to vertical velocity fluctuations in the vortex-induced downwash region.

Funding

Loughborough University

EPSRC grant no. EP/P020232/1

Engineering and Physical Sciences Research Council (EPSRC)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Journal of Wind Engineering and Industrial Aerodynamics

Volume

227

Publisher

Elsevier BV

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

2022-05-24

Publication date

2022-06-13

Copyright date

2022

ISSN

0167-6105

Language

  • en

Depositor

Dr Andrew Garmory. Deposit date: 30 June 2022

Article number

105049

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