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Aerodynamic Characterization of a Full-Scale Compact Car Exposed to Transient Crosswind

Bell, James and Wilhelmi, Henning and Heine, Daniela and Jessing, Christoph and Wagner, Andreas and Wiedemann, Jochen and Wagner, Claus (2021) Aerodynamic Characterization of a Full-Scale Compact Car Exposed to Transient Crosswind. SAE International Journal of Passenger Cars - Mechanical Systems, 14 (1), pp. 1-18. Society of Automotive Engineers. doi: 10.4271/06-14-01-0001. ISSN 1946-3995.

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Official URL: https://doi.org/10.4271/06-14-01-0001


The transient surface pressure over a full-scale, operational compact automotive vehicle—a Volkswagen Golf 7—exposed to transient crosswinds with relative yaw angles of β = 22-45° has been characterized. Experiments were performed at the BMW side-wind facility in Aschheim, Germany. Measurements of the incoming flow in front of the car were taken with eleven five-hole dynamic pressure probes, and separately, time-resolved surface pressure measurements at 188 locations were performed. Unsteady characteristics (not able to be identified in quasi-steady modelling) have been identified: the flow in separated regions on the vehicle’s leeward side takes longer to develop than at the windward side, and spatially, the vehicle experiences local crosswind as it gradually enters the crosswind. The total effects of these localized unsteady pressure characteristics have also been predicted to affect the vehicle globally, with the evaluation of the transient forces and moments—through pressure integration—exhibiting unsteady characteristics of overshoots, undershoots, and temporal lag; relative to steady crosswind. These results provide new insight into both the characteristics and the causes of the unsteady crosswind response of a real, operational vehicle operating in real-world conditions. This insight can be used in the design of future vehicles to make them less sensitive to unsteady gusts. Further these results can be used to develop and validate numerical and reduced-scale experimental methods that can test and assess new vehicle geometry designs during the early stages of vehicle development.

Item URL in elib:https://elib.dlr.de/142566/
Document Type:Article
Additional Information:ISSN: 1946-3995, e-ISSN: 1946-4002
Title:Aerodynamic Characterization of a Full-Scale Compact Car Exposed to Transient Crosswind
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bell, JamesUNSPECIFIEDhttps://orcid.org/0000-0001-8319-9817UNSPECIFIED
Wilhelmi, HenningUNSPECIFIEDhttps://orcid.org/0000-0002-0086-287XUNSPECIFIED
Heine, DanielaUNSPECIFIEDhttps://orcid.org/0000-0001-7967-5542UNSPECIFIED
Jessing, ChristophUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wagner, AndreasUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wiedemann, JochenUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:7 April 2021
Journal or Publication Title:SAE International Journal of Passenger Cars - Mechanical Systems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-18
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Society of Automotive Engineers
Keywords:vehicle aerodynamics, transient crosswind, unsteady, gust, side wind, surface pressure, drag, side force
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bell, Dr. James
Deposited On:16 Jun 2021 15:51
Last Modified:23 Oct 2023 10:32

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