Rotational Oscillation Effect on Flow Characteristics of a Circular Cylinder at Low Reynolds Number

Alice Rosa da Silva^1*, Aristeu da Silveira-Neto², Antônio Marcos Gonçalves de Lima²

¹School of Civil Engineering, Federal University of Uberlandia, Uberlandia, Brazil.
²School of Mechanical Engineering, Federal University of Uberlandia, Brazil.

DOI: 10.4236/wjm.2015.510019                

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.

Keywords

Rotationally Oscillating Cylinder, Vortex Shedding Modes, Drag Coefficient

Conflicts of Interest

The authors declare no conflicts of interest.

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