Abstract
Fluid-dynamic forces on a rotating circular cylinder in a uniform flow were obtained by numerically solving the vorticity transport equation. the ranges of calculation are from 20 to 100 for the Reynolds number, Re, and from 0 to 2 for the specific rotating speed, |V0|, the ratio of the peripheral speed of the cylinder to the uniform velocity. The results of calculation show that the temporal-mean lift coefficient is nearly independent of Re and is proportional |V0|. On the other hand, the temporal-mean pressure drag coefficient increases proportionately to V02 and that increment is due to induced drag in two-dimensional flow, while the skin-friction drag is independent of V0. The amplitude of the temporally fluctuating lift coefficient is maximum at |V0|e0.5 which is larger when Re is larger. The amplitude and frequency seem to be strongly affected by the width of the formation region.
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