E-215 ジェットの不安定から生じた渦列の渦度分布の統計

概要

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Statistics for vorticity distribution of vortices formed by instability of a jet is investigated. First, numerical calculation is performed, using a jet with a Gaussian velocity profile as initial state in quasi-geostrophic system. The vortex formation process is simulated : after meandering of the jet, steady vortices are formed. In order to explain the potential vorticity distribution in the steady state, statistics theory of vorticity mixing for two-dimensional fluid is applied to these vortices formed from jet instability. In this theory, the initial state is characterized by fluid patches with several kinds of vorticity values. For application of this theory, fluid which consists of three values of potential vorticity in the initial state, is considered. Although the theory is applied to very simplified situation, the theoretically derived stream function vs. potential vorticity relation well predicts the result in the numerical calculation.
日本流体力学会の論文
2003-07-28