Structure and stability of hollow vortex equilibria

Structure and stability of hollow vortex equilibria
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空心涡平衡结构及其稳定性

DOI:
10.1017/jfm.2011.467
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发表时间:
2011
影响因子:
3.7
通讯作者:
Llewellyn Smith S
Llewellyn Smith S
中科院分区:
工程技术2区
文献类型:
--
作者:
Llewellyn Smith S

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本文考虑二维中空涡平衡点的结构和线性稳定性。利用自由流线理论,导出了线性和非线性应变流动中单个空心涡的平衡解的解析形式。然后用数值方法确定了这类解的线性稳定性性质,识别出了一种新型的共振诱导位移失稳。结果表明,圆形中空涡的其中一种形状变形模式与涡心位移对应的一种模式具有相同的频率。当孤立的空心涡位于三级应变流动中时,可以观察到这种不稳定性。我们还重温了Baker,Saffman&Shefffield(J.Fluid Mech,Vol.74,1976,p.1469)提出的空心涡排解,由于目前文献中缺乏它,我们使用Floquet分析给出了这个解的完全线性稳定性分析。
This paper considers the structure and linear stability of two-dimensional hollow vortex equilibria. Equilibrium solutions for a single hollow vortex in linear and nonlinear straining flows are derived in analytical form using free streamline theory. The linear stability properties of this solution class are then determined numerically and a new type of resonance-induced displacement instability is identified. It is found to be a consequence of the fact that one of the shape distortion modes of a circular hollow vortex has the same frequency as one of the modes corresponding to displacement of the vortex centroid. The instability is observed in the case of an isolated hollow vortex situated in straining flow of order three. We also revisit the hollow vortex row solution due to Baker, Saffman & Sheffield (J. Fluid Mech., vol. 74, 1976, p. 1469), and since it is currently lacking in the literature, we present a full linear stability analysis of this solution using Floquet analysis.
二维均匀涡度区域的形状和稳定性
DOI: 10.7907/nw61-5178
发表时间: 1987
影响因子: 3.7
作者:
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均匀涡旋线性阵列的结构
DOI: --
发表时间: 1981
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DOI: --
发表时间: 1988
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