風波乱流場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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In this study, Direct numerical simulation (DNS) of wind-driven turbulent flow at the Reynolds number is about 3 300 based on the gas layer height and the free stream velocity, was conducted by the direct numerical solution procedure (MARS method) for a coupled gas-liquid flow. As the results, completely mass conservation was kept during the all calculation time and the capacity of MARS method as the method for DNS of multiphase turbulent flow indicated. In wind-driven turbulent flow, local friction coefficient in gas side was 15% decreased compared with the wall turbulent flow. Near free surface, large horizontal scale shaped the water surface wave motion supplied the velocity fluctuations to the fluid motion. But, vertical component of turbulent intensity was constrained by the water surface existence as well as turbulent open-channel flow at low Froude number. In both gas- and water-side, high and low speed streaky structures were observed and these structures and surface wave motion was interacted each other. It seems that relationships between wave height and turbulent boundary layer thickness was one of the important factors in wind-driven turbulent structure.
一般社団法人日本機械学会の論文
2002-01-25