Reconnection of orthogonal cylindrical vortices

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• 作者：Ruben Suaza Jaque ; Oscar Velasco Fuentes ; ^{ovelasco@cicese.mx}
• 关键词：Vortex reconnection ; Cylindrical vortex ; Numerical simulation
• 刊名：European Journal of Mechanics - B/Fluids
• 出版年：2017
• 出版时间：March-April 2017
• 年：2017
• 卷：62
• 期：Complete
• 页码：51-56
• 全文大小：979 K
• 卷排序：62

文摘

This paper reports on a numerical study of the interaction of a pair of orthogonal cylindrical vortices. The vortices have equal radii and vorticity distributions, which are chosen to be either uniform or parabolic, and are initially located at various distances. A vortex-in-cell model simulates the flow evolution in a triply periodic cube; the model contains no viscous terms but it introduces a small numerical viscosity (equivalent to Re>15000Re>15000). It was found that the time at which the reconnection starts significantly increased with the initial distance between the vortices; in contrast, the reconnection lasted approximately 3/4 of the eddy turnover time for all initial distances and the two vorticity profiles considered in this study. This confirms that the reconnection is a convective process made possible by even the weakest viscosity.