Reconnection of vortex tubes with axial flow
Reconnection of vortex tubes with axial flow
复制标题
轴流涡流管的重新连接
DOI：
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发表时间：
2019
影响因子：
2.7
通讯作者：
D. Pontin
中科院分区：
文献类型：
--
作者：
P. McGavin;D. Pontin
本文采用数值模拟的方法研究了含有轴向流的反平行涡流管的相互作用，这种轴向流引起涡流线绕管轴扭转。涡流管配置与相同和相反的意义上的扭曲-对应于相同和相反的符号的动力学螺旋度密度-被认为是。结果表明，重联过程的拓扑结构在两种情况下有很大的不同。对于具有相同扭曲方向的管，重连是完全三维的（3D）：涡线以有限的角度重新连接，并且可能产生3D涡零点。在重联之后，桥结构和螺纹结构中的涡线拓扑都表现出高度的复杂性。对于扭转相反的管的重联是局部二维的，发生沿着涡度零线，这与非扭转的情况下，不垂直于管轴。这导致在重联期间产生的两个涡桥之间的对称性的破坏。对于所研究的所有情况，增加涡流管中的扭曲导致更晚，更快，更完整的重连过程。
This paper addresses the interaction of initially anti-parallel vortex tubes containing an axial flow that induces a twisting of the vortex lines around the tube axes, using numerical simulations. Vortex tube configurations with both the same and opposite senses of twist -- corresponding to same and opposite signs of kinetic helicity density -- are considered. It is found that the topology of the reconnection process is very different between the two cases. For tubes with the same sense of twist, the reconnection is fully three-dimensional (3D): vortex lines reconnect at a finite angle, and 3D vortex null points may be created. Following reconnection the vortex line topology in both bridge and thread structures exhibits a high degree of complexity. For oppositely-twisted tubes the reconnection is locally two-dimensional, occurring along vorticity null lines, that in contrast to the untwisted case are not perpendicular to the tube axes. This leads to a break in the symmetry between the two vortex bridges generated during reconnection. For all cases studied, increasing the twist in the vortex tubes leads to a later, faster, and more complete reconnection process.
影响因子：
56.9
作者：
Martin W. Scheeler;Wim M. van Rees;Hridesh Kedia;D. Kleckner;W. Irvine
通讯作者：
Martin W. Scheeler;Wim M. van Rees;Hridesh Kedia;D. Kleckner;W. Irvine