| 圆柱尾迹涡的三维演化及结构特征 |
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| 引用本文： | 武作兵,凌国灿.圆柱尾迹涡的三维演化及结构特征[J].力学学报,1993,25(3):264-275. |
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| 作者姓名： | 武作兵 凌国灿 |
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| 作者单位： | 中国科学院力学研究所 |
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| 摘 要： | 应用无粘涡丝运动学理论和局部诱导近似(LIA)方法,以Lagrange观点跟踪涡丝在背景流场中运动,用数值方法研究了中等Re数(≈10~3)下圆柱分离尾迹中Kármán涡和涡辫区涡丝的三维演化的机制和动力学过程,及其结构特征。背景流场考虑为尾迹时间平均速度流场和Kármán涡街流场。初始展向小扰动为指数形式和谐波形式。结果指出:Kármán涡和涡辫区中的涡丝具有展向不稳定性,形成流向涡量。在尾迹的初期输运过程中,表现出有序的大、小尺度涡结构。并进一步分析了其产生的机理。
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| 关 键 词： | 尾迹 涡街 拟序结构 涡 圆柱 涡线 |
NUMERICAL STUDY ON THE MECHANISM FOR THREE-DIMENSIONAL EVOLUTION OF VORTEX AND THE STRUCTURAL FEATURES IN THE WAKE BEHIND A CIRCULAR CYLINDER |
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| Wu Zuobing,Ling Guocan.NUMERICAL STUDY ON THE MECHANISM FOR THREE-DIMENSIONAL EVOLUTION OF VORTEX AND THE STRUCTURAL FEATURES IN THE WAKE BEHIND A CIRCULAR CYLINDER[J].chinese journal of theoretical and applied mechanics,1993,25(3):264-275. |
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| Authors: | Wu Zuobing Ling Guocan |
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| Abstract: | In this paper, the mechanism and dynamic process for three-dimensional evolution of the Karman vortices and the vortex filaments in the braid regions, and the structural features in the wake behind a ciccular cylinder at moderate Reynolds number (≈103) have been studied numerically. The vortex filament in the wake field are tracked by the inviscid vortex dynamics and the localized-induction approximation (LIA) method. The time-averaged velocity field of the wake and Karman vortex street flow field are consi... |
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| Keywords: | wake Karman vortex street braid region streamwise vorticity coherent structure |
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