Vehicle Aerodynamics: Drag Reduction by Surface Dimples
Commenced in January 2007
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Edition: International
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Vehicle Aerodynamics: Drag Reduction by Surface Dimples

Authors: C. K. Chear, S. S. Dol

Abstract:

For a bluff body, dimples behave like roughness elements in stimulating a turbulent boundary layer, leading to delayed flow separation, a smaller wake and lower form drag. This is very different in principle from the application of dimples to streamlined body, where any reduction in drag would be predominantly due to a reduction in skin friction. In the present work, a car model with different dimple geometry is simulated using k-ε turbulence modeling to determine its effect to the aerodynamics performance. Overall, the results show that the application of dimples manages to reduce the drag coefficient of the car model.

Keywords: Aerodynamics, Boundary Layer, Dimple, Drag, Kinetic Energy, Turbulence.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099892

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[1] Ahmed, S.R., Ramm, G. & Faltin G. (1984). Some salient features of the times-averaged ground vehicle wake. SAE Society of Automotive Eng., Inc, 1(840300):1 – 31.
[2] Dol, S.S., Kopp, G.A. & Martinuzzi, R.J.M. (2008). The suppression of periodic vortex shedding from arotating circular cylinder. Journal of Wind Engineering and Industrial Aerodynamics 96, 1164 – 1184.
[3] Hermann, L., Michael, B. & Cagatay, K. (2008). Drag Reduction by dimples? A Complementary Experimental/Numerical Investigation. International Journal of Heat and Fluid Flow 29(3), 783 - 791.
[4] Munson, B.R, Young, D.F. & Okiishi, T.H. (2002). Fundamentals of Fluid Mechanics, 4th Edition, John Wiley and Sons.
[5] Srivastav, D. (2012) Flow control over airfoils using different shaped dimples. International Conference on Fluid Dynamics and Thermodynamics Technologies (p. 92-97). Singapore: IACSIT Press.
[6] White, F.M. (2003). Fluid Mechanics, 5th Edition McGraw Hill.