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Computational aero-acoustic analysis of a passenger car with rear spoiler. Computer Science and Education (ICCSE 2011), SuperStar Virgo, Singapore.Ĭhien-Hsiung, T., Lung-Ming, F., Chang-Hsien, T., Yen- Loung, H. Study the effect of rear spoiler on car aerodynamic characteristics.

They vanish with the rear wing placed close to the trunk, while they gradually restore with an increase in the wing mounting height.īao, H. Two characteristic large vortices develop in the automobile wake in configuration without the rear wing. An optimal automobile downforce-to-drag ratio is obtained for the rear wing placed at 39 % of the height between the upper surface of the automobile trunk and the automobile roof. However, this drawback is not that significant, as the rear wing considerably benefits the automobile traction and stability. At the same time, the rear wing increases the automobile drag that is not favorable with respect to the automobile fuel consumption. While the lift force is positive (upforce) for the automobile without the rear wing, negative lift force (downforce) is obtained for all configurations with the rear wing in place. Computations are performed by using the Reynolds-averaged Navier-Stokes equations along with the standard k- ε turbulence model and standard wall functions assuming the steady viscous fluid flow. Hence, the discrepancies in the results are only due to an influence of the rear wing position. The relative wind incidence angle of the rear wing is equal in all configurations. The focus is on effects of the rear wing height that is investigated in four different positions. Computational model is developed to analyze aerodynamic loads and flow characteristics for an automobile, when the rear wing is placed above the trunk of the vehicle.

Airfoil wing