風波気液界面近傍の乱流とスカラ輸送の直接数値シミュレーション(流体工学,流体機械)

概要

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Three-dimensional direct numerical simulation (DNS) is applied to a wind-driven air-water two-phase flow, and the turbulence structure in boundary layers on both gas and liquid sides and the scalar transfer mechanism across the air-water interface are investigated. In order to capture the air-water interface behavior, an Arbitrary Lagrangian Eulerian formulation (ALE) method is employed. The results show that compared to the gas side, fluid motion on the liquid side is strongly affected by wind waves and micro-breaking waves (i.e. ripples) formed on the leeward side of the wind waves. That is, the wind waves and micro-breaking waves dramatically enhance the transition to turbulence on the liquid side. The scalar transfer across the wind-driven air-water interface is mainly controlled by the longitudinal vortices related to bursting motions on the liquid side.
2010-04-25