Journal
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
Volume 173, Issue -, Pages 14-27Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2017.12.003
Keywords
High Reynolds number; Flow separation; Rounded corners; Square section cylinder; Bluff body; Surface roughness; Wind tunnel
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In this study, the aerodynamics of 2D, slightly rough, square-section cylinders with rounded corners is experimentally investigated for Reynolds numbers up to about 12 x 10(6). The cylinders have a mean relative surface roughness of k/D = 1 x 10(-3), a corner radius of either r/D = 0.16 or 0.29 and are positioned at an angle of incidence of 0 degrees or -45 degrees in cross-flow direction. The results show that a larger corner radius induces lower drag coefficients and higher vortex shedding frequencies for all flow regimes, but at lower shedding intensities. Changing the angle of incidence from 0 degrees to -45 degrees results in all coefficients and the wake profile to become nearly independent of the Reynolds number. The critical flow state furthermore shifts to higher Reynolds numbers and decreases in length, whereas the supercritical flow state reduces to a single point. An increase of the surface roughness height from k/D = 5 x 10(-6) to k/D = 1 x 10(-3) induces a shift of the flow regimes towards significantly lower Reynolds numbers. The values of the coefficients show a lower dependency on the Reynolds number in all flow regimes, whereas in the upper transition a strong recovery of all coefficients towards subcritical values takes place.
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