Journal article Open Access

Vehicle Aerodynamics: Drag Reduction by Surface Dimples

C. K. Chear; S. S. Dol

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.

Files (356.3 kB)
Name Size
356.3 kB Download
  • 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.

  • 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.

  • 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.

  • Munson, B.R, Young, D.F. & Okiishi, T.H. (2002). Fundamentals of Fluid Mechanics, 4th Edition, John Wiley and Sons.

  • 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.

  • White, F.M. (2003). Fluid Mechanics, 5th Edition McGraw Hill.

All versions This version
Views 1010
Downloads 1111
Data volume 3.9 MB3.9 MB
Unique views 1010
Unique downloads 1010


Cite as