D125 格子ボルツマン法による二相流体の変形・分裂の数値解析

概要

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We present two-and three-dimensional numerical results of two-phase fluid motion in a shear flow by the lattice Boltzmann method (LBM), which assumes that a macroscopic fluid consists of mesoscopic fluid particles repeating collisions with each other and translations along spatial lattice lines. In LBM, a multiphase interface is reproduced automatically in a self-organizing way without any boundary condition for interfacial geometry by introducing repulsive interaction between particles. This study puts the advantage to use for simulations of bubble deformation and breakup in a uniform shear flow, and makes clear hydrodynamic mechanism to generate fine bubble with 10μm-order diameter, which is available in repairing O_2-poor water environment. In the numerical results, a circular or spherical bubble deformed to be ellipsoidal, and was stretched to break up into smaller pieces when a shear stress overcame surface tension.
日本流体力学会の論文
2001-07-31