E133 二相流動の格子ボルツマンシミュレーション

概要

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We describe the numerical simulation results of two-phase fluid motions under gravity by the lattice Boltzmann method (LBM), which assumes that a fluid consists of mesoscopic fluid particles repeating collision and translation and a multiphase interface is reproduced in a self-organizing way by repulsive interaction between different kinds of particles. The purposes in this study are to examine the applicability of LBM to the numerical analysis of bubble motions to develop a three-dimensional version of the binary fluid model which introduces a free energy function. We included the buoyancy terms due to the density difference in the lattice Boltzmann equations, and simulated single- and two-bubble motions, setting flow conditions according to the Eotvos and Morton numbers. The three-dimensional model possesses the surface tension satisfying the Laplace's law, and reproduces the steady motion of single bubble in agreement with experimental data and the two-bubble interaction of their approach and coalescence in circular tube. The validity of coalescence process in the results is under consideration.
日本流体力学会の論文
2000-07-25