Abstract
The effects of Reynolds number (Re), freestream turbulence intensity (Tu) and integral length scale (<TEX>${\Lambda}$</TEX>) on the drag coefficient (<TEX>$C_d$</TEX>) of a circular cylinder in cross flow were experimentally studied for <TEX>$6.45{\times}10^3$</TEX> < Re < <TEX>$1.82{\times}10^4$</TEX>. 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 <TEX>$C_d$</TEX> with increasing Tu. The effectiveness of Tu in reducing <TEX>$C_d$</TEX> is found to lessen with increasing <TEX>${\Lambda}$</TEX>/D. Most interestingly, freestream turbulence of low Tu (<TEX>${\approx}5%$</TEX>) and large <TEX>${\Lambda}$</TEX>/D (<TEX>${\approx}1.05$</TEX>) can increase the <TEX>$C_d$</TEX> above the corresponding smooth flow value.
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