Tyre aerodynamics of passenger vehicles
In this work, both the correlation between experiments and simulations as well as the flow field effect of varying the tyre tread pattern are investigated. Wind tunnel tests using a full-scale DrivAer model have been performed for four tyre tread patterns and two rim designs. First, the numerical simulations are compared to the experiments, where the interference of the wind tunnel on wheel flows is investigated. By performing simulations using both an open road domain and a domain containing a detailed model of the wind tunnel, it was found that the inclusion of the wind tunnel improves predictions of both absolute drag values as well as the drag deltas between configurations.
Then, the effects of the different tyre tread patterns are analysed in more detail. Results showed that adding rain grooves typically reduces drag compared to a slick tyre, whereas the effect of lateral grooves is dependent on the rim configuration. In addition to the drag, lift variations were considered. There, the largest effects were obtained at the front axle and, in general, the lift is reduced by the rain grooves and increased by the lateral grooves, most clearly for the closed rim. Also, the influence of the parasitic lift forces acting on the wheel drive units was demonstrated.
Chalmers, Mekanik och maritima vetenskaper, Fordonsteknik och autonoma system
Evaluation of wind tunnel interference on numerical prediction of wheel aerodynamics
Journal of Wind Engineering and Industrial Aerodynamics,; Vol. 224(2022)
Artikel i vetenskaplig tidskrift
Josefsson, E., Hobeika, T., Sebben, S., and Urquhart, M., Investigation of Tyre Pattern Effect on the Aerodynamics of a Passenger Vehicle
Ökad noggrannhet på däckmodellering för att stödja utvecklingen av energieffektiva fordon
Energimyndigheten (2019-013226), 2019-11-05 -- 2023-12-31.
Strömningsmekanik och akustik
HA2, Hörsalsvägen 4
Opponent: Apl. Prof. Dr.-Ing. habil Thomas Indinger, Technical University of Munich, Germany