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Spectral Analysis of a Vortex Wake Behind a Circular Cylinder in a Channel at Moderate Reynolds Numbers
Lobachevskii Journal of Mathematics Pub Date : 2021-09-05 , DOI: 10.1134/s199508022108014x
E. Kalinin 1 , A. Mazo 1 , V. Molochnikov 2 , O. Dushina 2
Affiliation  

Abstract

Direct numerical simulation is employed to study the complex vortical flow in the wake of a circular cylinder in a rectangular channel at \(\textrm{{Re}}\approx 10^{2}\). Formation and development of vortices behind bodies are governed by two phenomena: Karman street in the central part of the channel and a pair of spiral peripheral vortices near the channel sidewalls. Both of these phenomena introduce their own disturbances to the flow and can be essential depending on the Reynolds number and geometry of the cross section. Fourier transform yielded spectral density of kinetic energy of velocity fluctuations at fixed sample points in the flow and also revealed the patterns in formation of vortical properties of the wake, including the transition to turbulence and self- oscillations of aerodynamics coefficients of the streamlined body.



中文翻译:

中等雷诺数下通道中圆柱后涡流尾迹的光谱分析

摘要

采用直接数值模拟研究\(\textrm{{Re}}\approx 10^{2}\). 物体后涡的形成和发展受两种现象控制:通道中央部分的卡门街和通道侧壁附近的一对螺旋外围涡。这两种现象都会对流动产生干扰,并且根据雷诺数和横截面的几何形状可能是必不可少的。傅里叶变换产生了流动中固定采样点速度波动动能的谱密度,并揭示了尾流涡旋特性的形成模式,包括流线体的空气动力学系数向湍流的过渡和自振荡。

更新日期:2021-09-06
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