壁近傍高分子添加による平行平板間乱流の摩擦抵抗低減(流れの制御(1),一般講演)

概要

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A discrete-element model (spring-dumbbell model) is used to investigate the mechanism of drag reduction by addition of a small amount of polymer in turbulent wall-bounded flow of Newtonian fluid by direct numerical simulations. By using the discrete-element model, the spatial concentration of the polymer can be obtained numerically. In this study, the effect of the initial distribution of the concentration upon the drag reduction rate is examined in detail. In the near-wall concentrated case as initial condition, the drag reduction rate is increasing with time, and quickly reaches to almost the same level as the former with spatially uniform distribution. This is mainly because the strong turbulent diffusion survives due to the small drag reduction. The effects of parameters of discrete-element model upon the drag reduction rate and the diffusion mechanism are also examined.
日本流体力学会の論文
2008-09-04