Alief Avicenna Luthfie, Dedik Romahadi, Solli Murtyas


Spoiler attached on the rear part of a car can generate drag force and negative lift force, called downforce. This drag force can increase air resistance to the car, meanwhile, negative lift force can improve the car’s stability and safety. Refer to many researchers, the shape and the angle of the spoiler give different aerodynamic effect and therefore give different value of drag force and lift force. Based on these facts, this study was focused on analysis of different spoiler angle attached to a mini MPV car to drag and lift force generated by the spoiler. The method used in this study is numerical simulation using Computational Fluid Dynamics (CFD) technique. The analysis was carried out at different spoiler angle and car’s speed. The spoiler angles are -20o, -10o, 0o, 10o, and 20o. The car’s speeds are 40 km/h, 60 km/h, 80 km/h, 100 km/h, and 120 km/h. Then the drag and lift force and their coefficient generated by different spoiler angle was being investigated at specified speeds. The result shows that higher spoiler angles generate higher drag and lower lift. Spoiler angles higher than 0o generate negative lift force, otherwise generate positive lift force. Therefore, to increase car’s stability and safety, it is recommended to use spoiler angle higher than 0o. Based on the result, it is best to use spoiler angle 10o because it generates negative lift force with -0.05 lift coefficient and 0,68 drag coefficient.


Mini MPV car, rear spoiler angle, drag, lift, numerical simulation


Das, R. C., & Riyad, M. (2017). CFD analysis of passenger vehicleat various angle of rear end spoiler. Procedia Engineering, 194, 160–165.

Kim, S. J., Yoo, C. H., & Kim, H. K. (2016). Vulnerability assessment for the hazards of crosswinds when vehicles cross a bridge deck. Journal of Wind Engineering and Industrial Aerodynamics, 156, 62–71.

Kurec, K., Remer, M., Mayer, T., Tudruj, S., & Piechna, J. (2019). Flow control for a car-mounted rear wing. International Journal of Mechanical Sciences, 152, 384–399.

Munson, B. M., Okiishi, T. H., Huebsch, W. W., & Rothmayer, A. P. (2013). Fundamentals of Fluid Mechanics. New York: John Wiley & Sons, Inc.

Pranoto, H., Feriyanto, D., & Zakaria, S. (2019). Performance and Exhaust Gas Temperature Investigation of Ceramic, Metallic and FeCrAl Catalytic Converter in Gasoline Engine. Sinergi, 23(1), 11–16.

Susanto, E., & Gunardi, Y. (2013). Disain dan Implementasi Pengendali Lampu Jarak Jauh dan Dekat Pada Kendaraan Bermotor Secara Otomatis. Sinergi, 17, 225–230.

Tsai, C. H., Fu, L. M., Tai, C. H., Huang, Y. L., & Leong, J. C. (2009). Computational aero-acoustic analysis of a passenger car with a rear spoiler. Applied Mathematical Modelling, 33(9), 3661–3673.

Yuan, C. S., Mansor, S., & Abdullah, M. A. (2017). Effect of spoiler angle on the aerodynamic performance of hatchback model. International Journal of Applied Engineering Research, 12(22), 12927–12933.


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