AM06-13-007 鉛直シアー場における冷却による渦生成(大気・海洋・惑星の流れ(2),一般講演)

概要

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Vortex genesis and its elongation to the ground induced by evaporational cooling in linearly sheared environment are investigated. In weak shear experiments, the vortex developed at the top of cooling is advected obliquely downward. In strong shear experiments, the vortex developed at the top of the cooling region is advected downward with large tilt at first. On the way to the ground, however, strong vertical wind shear advects the vortex advected away from the cooing region where there is no downward motion. We introduce a non-dimensional number SI which is defined by vertical wind shear (S), cooling rate (C) and radius of cooling region (L). From the experiments with various S, C and L, it is demonstrated that SI determines the influence of vertical wind shear on the vortex elongation to the ground.
日本流体力学会の論文
2006-09-05