309 不溶性液滴を含む乱流液流の数値シミュレーション(FM-4 流れ解析の基礎について)

概要

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A direct numerical simulation has been carried out in order to clarify the effects of the high viscosity and the interfacial tension of a droplet on the interaction between the droplet and near-wall turbulence. A liquid turbulent plane Couette flow with an immiscible droplet of the same fluid density as that of the continuous-phase has been used. The modified Volume of Fluid (VOF) algorithm and local grid refinement are used for tracking the phase interface. The velocities for the fine grid are decided so that the equation of continuity is satisfied in the fine cell. It is found that the deformation of the droplet due to the surrounding fluid flow is suppressed by the effect of the interfacial tension of the droplet. The streamwise vortex is attenuated by the existence of the droplet with the interfacial tension. The small vortex is generated in the wake region of the droplet. The Reynolds-shear stress product becomes higher in a wide region around the droplet.
一般社団法人日本機械学会の論文
2001-03-16