The tripole : a new coherent vortex structure of incompressible two-dimensional flows
The tripole : a new coherent vortex structure of incompressible two-dimensional flows
复制标题
三极子：不可压缩二维流的新相干涡结构
DOI：
10.1080/03091929008219852
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发表时间：
1990
影响因子：
1.3
通讯作者：
X. Carton
中科院分区：
文献类型：
--
作者：
L. Polvani;X. Carton
Abstract Using a contour dynamical algorithm, we have found rotating tripolar V-state solutions for the inviscid Euler equations in two-dimensions. We have studied their geometry as a function of their physical parameters. Their stability was investigated with the aid of contour surgery, and most of the states were found to be stable. Under finite-amplitude perturbations, tripoles are shown to either fission into two asymmetric dipoles or to evolve into a shielded axisymmetric vortex, demonstrating the existence of two new ‘‘reversible transitions'’ between topologically distinct coherent vortex structures. These dynamical results are confirmed by pseudo-spectral simulations, with which we also show how continuous tripolar long-lived coherent vortex structures can be generated in a variety of ways.
