The subtle effect of integral scale on the drag of a circular cylinder in turbulent cross flow

  • Younis, Nibras (Mechanical, Automotive & Materials Engineering University of Windsor Windsor) ;
  • Ting, David S.K. (Mechanical, Automotive & Materials Engineering University of Windsor Windsor)
  • Received : 2011.04.07
  • Accepted : 2012.04.19
  • Published : 2012.11.25


The effects of Reynolds number (Re), freestream turbulence intensity (Tu) and integral length scale (${\Lambda}$) on the drag coefficient ($C_d$) of a circular cylinder in cross flow were experimentally studied for $6.45{\times}10^3$ < Re < $1.82{\times}10^4$. With the help of orificed plates, Tu was fixed at approximately 0.5%, 5%, 7% and 9% and the normalized integral length scale (L/D) was varied from 0.35 to 1.05. Our turbulent results confirmed the general trend of decreasing $C_d$ with increasing Tu. The effectiveness of Tu in reducing $C_d$ is found to lessen with increasing ${\Lambda}$/D. Most interestingly, freestream turbulence of low Tu (${\approx}5%$) and large ${\Lambda}$/D (${\approx}1.05$) can increase the $C_d$ above the corresponding smooth flow value.


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