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Rotational Oscillation Effect on Flow Characteristics of a Circular Cylinder at Low Reynolds Number
School of Civil Engineering, Federal University of Uberlandia, Uberlandia, Brazil
School of Mechanical Engineering, Federal University of Uberlandia, Brazil
School of Mechanical Engineering, Federal University of Uberlandia, Brazil
- 1 School of Civil Engineering, Federal University of Uberlandia, Uberlandia, Brazil
- 2 School of Mechanical Engineering, Federal University of Uberlandia, Brazil
- 3 School of Mechanical Engineering, Federal University of Uberlandia, Brazil
World Journal of Mechanics·Volume 05 (2015)·Pages 195–209·Published 26 October 2015·DOI10.4236/wjm.2015.510019
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Abstract
Two dimensional numerical simulations of flow around a rotationally oscillating circular cylinder were performed at Re = 1000. A wide range of forcing frequencies, f r , and three values of oscillation amplitudes, A, are considered. Different vortex shedding modes are observed for a fixed A at several values of f r , as well as for a fixed f r at different values of A. The 2C mode of vortex shedding was obtained in the present study. It is important to point out that this mode has not been observed by other investigators for rotationally oscillating case. Also, it is verified that this mechanism has great influence on the drag coefficient for high frequency values. Furthermore, the lift and pressure coefficients and the power spectra density are also analyzed.
KeywordsRotationally Oscillating CylinderVortex Shedding ModesDrag Coefficient
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