Abstract
The wavy cylinder has a sinusoidal variation incross sectional area along the spanwise direction and the twistedcylinder has been newly designed by rotating the elliptic crosssection along the spanwise direction, so that the cylinder surfacehas a twisted spiral pattern. A twisted cylinder is investigated toobserve the effect of twisted spiral pattern of the flow fields. Itguarantees the accuracy of the present numerical methods thatthe excellent comparisons with previous studies for the cases of asmooth circular cylinder. The effect of surface torsion which isnewly designed in here has been predicted and assessed in termsof the mean drag and root-mean-square (RMS) value offluctuating lift at the subcritical Reynolds number of 3000.Subsequently, the mechanisms of enhancing the aerodynamicperformance and passive control of vortex-induced vibrations arealso investigated by careful analysis with the flow structures. Theiso-surface of swirling strength has been imposed to identify thevortical structures in the turbulent wake
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