回転軸が鉛直方向から傾いた系におけるsin型水平シア流と熱対流の相互作用(対流・拡散・渦・波動対流(1),一般講演)

概要

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We study thermal convections in a sine-type horizontal shear flow in a rotating system with a tilted axis. Linear stability analyses are done to show that a herringbone pattern which is formed in non-linear time evolutions corresponds to the structure of the largest growing eigenmode of the initial field. Analysing second-order effects of the linear eigenmode, we show that contribution of the Colioris force acting on the second-order vertical flow to the acceleration of the mean flow is larger than that of direct momentum transport proposed by Hathaway & Somerville (1987). Further detailed analyses of this effect show that the following process is important. At first, thermal transport by disturbances generates buoyant deviations. Next, the buoyant deviations produce a vertical flow. Finally, the Colioris force acting on the vertical flow accelerates the mean flow.
日本流体力学会の論文
2009-09-02