208 格子ボルツマン法による物体を含む流れ場の三次元気泡流解析(S37-1 CFDの新展開(1),S37 CFDの新展開)  [in Japanese] 208 Lattice Boltzmann Simulation of Three-Dimensional Bubble Flow in a Channel including Solid Bodies  [in Japanese]

The lattice Boltzmann method for two-phase immiscible fluids with large density differences proposed by Inamuro et al. [J. Comput. Phys., 198(2004), 628-644] is applied to the problem of liquid-gas flows through solid bodies in a square duct. Considering wetting dynamics of solid walls by liquid-gas fluids, the boundary condition followed by the Cahn theory is introduced on the walls. We first investigate the characteristics of wettability in terms of a contact angle between the liquid-gas interface and the wall. After confirming the validity of the method, we next carry out the simulations of liquid-gas rising flows through solid bodies in a square duct. It is found from these simulations that the present method can be useful for the problems of multiphase flows through complicated geometries.