The characteristics of the flow in the wake of a circular cylinder performing rotational oscillation about its own axis and placed horizontally in a cross-stream is investigated. The governing equations based on stream function-vorticity formulation are solved numerically to determine the flow field structure. The parameters dominating flow structure are Reynolds number, Re, amplitude of oscillation, and frequency ratio where S is the forcing frequency and is the natural frequency of vortex shedding. The ranges considered for these parameters are 40⩽Re⩽200, and The lock-on phenomenon has been predicted and its effect on the flow hydrodynamics has been determined. The lock-on phenomenon is found to occur within a band of frequency encompassing the natural frequency. This band, however, becomes wider as the amplitude of oscillation increases. The obtained results show that the flow pattern in the near wake has a strong dependence on the oscillation parameters but not the far wake. [S0098-2202(00)01102-0]
Flow Structure in the Wake of a Rotationally Oscillating Cylinder
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division June 15, 1998; revised manuscript received November 15, 1999. Associate Technical Editor: P. W. Bearman.
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Mahfouz, F. M., and Badr, H. M. (November 15, 1999). "Flow Structure in the Wake of a Rotationally Oscillating Cylinder ." ASME. J. Fluids Eng. June 2000; 122(2): 290–301. https://doi.org/10.1115/1.483257
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