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

• 作者: Alice Rosa da Silva Ant?nio Marcos Gon?alves de Lima Aristeu da Silveira-Neto
• 来源期刊: 力学国际期刊(英文)
• 学科: 物理学
• 关键词: Rotationally OSCILLATING Cylinder VORTEX SHEDDING MODES Drag Coefficient
• 年，卷（期）: lxgjqkyw_2015,（10）
• 页码范围: 195-209
• 页数: 15页
• 分类号: O35

摘要

Two dimensional numerical simulations of flow around a rotationally oscillating circular cylinder were performed at Re = 1000. A wide range of forcing frequencies, fr, and three values of oscillation amplitudes, A, are considered. Different vortex shedding modes are observed for a fixed A at several values of fr, as well as for a fixed fr 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.