フィラメントによる非一様楕円渦の軸対称化の促進(渦・回転(1),一般講演)

概要

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We examine the role of the filaments on the axisymmetrization of an isolated elliptic vortex with non-uniform vorticity distribution for a two-dimensional incompressible barotropic fluid, numerically. In order to perform quantitative examination of the role of filaments on the axisymmetrization, firstly, we divide the vorticity field into the elliptic region and the hyperbolic region. The former corresponds to the core of the vortex and the latter the filaments and a weak vorticity region just outside the vortex core. Secondly, we analyse the radial displacement of the maximum and minimum curvature points on a vorticity contour advected by velocities induced by the vorticity of those regions. These investigations result that the vorticity of the hyperbolic region largely contributes to the axisymmetrization at the both points, especially at the time when the filaments are forming.
日本流体力学会の論文
2010-09-09