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Forces and flow structures on a simplified car model exposed to a transient crosswind

Ferrand, Valérie and Grochal, Bartlomej Forces and flow structures on a simplified car model exposed to a transient crosswind. (2012) In: ASME 2012 Fluids Engineering Summer Meeting (FEDSM), 08 July 2012 - 12 July 2012 (Puerto Rico, United States).

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Official URL: http://dx.doi.org/10.1115/1.4025466

Abstract

A squareback simplified car model is exposed to a forced oscillating yaw and results are compared to static measurements. Tests are conducted at Reynolds number Re=3.7x105 and a maximum Strouhal number =0.053. Phase average force and moment measurements exhibit a phase shift between static and dynamic tests that increases with oscillating frequency. To gain better understanding of the origin of the phase shift phenomenon, this paper proposes to characterize the flow evolution around the model using PIV measurements. Phase-shift seems to originate from the pressure recovery area where velocity fields exhibit a time delay in their response to dynamic yawing. Moreover, lateral vortical structures appearing on lee side from =15° increase this phase-shift and consequently appear to be favourable to the lateral stability of the vehicle.

Item Type:Conference or Workshop Item (Paper)
Additional Information:JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, vol. 136, n°1, published: JANV 2014 - Publisher : ASME, ISSN : 0098-2202
Audience (conference):International conference proceedings
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Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
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Deposited By:Valérie Ferrand

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