【摘要】 具有介观特性的格子Boltzmann方法能够准确方便地捕捉相界面细节,在两相流动领域具有广泛的应用前景.本文在简要介绍格子Boltzmann方法的基础上,利用格子Boltzmann方法的颜色模型对四类经典两相流动问题进行了模拟,界面张力的Laplace定律验证、单液滴松弛过程、两个液滴融合过程、水平通道内不混溶液液两相流动.结果表明,液滴界面张力符合Laplace定律;黏性越大,液滴松弛过程越稳定;界面张力越大,液滴融合速度越快;格子Boltzmann方法能够有效描述液液两相流动的界而信息。研究工作为应用格子Boltzmann方法分析两相流动问题奠定了理论基础.更多还原

【Abstract】 The lattice Boltzrnann method characteristic of mesoscopic property can accurately and easily capture the multi-phases interface details,and thus has wide potential applications in the field of two-phase flows.Based on a brief introduction to the lattice Boltzrnann method,this paper applies the lattice Boltzrnann color model to four classic two-phase flow problems,including the Laplace’s law for interfacial tension,single droplet relaxation,two droplets’ fusion and immiscible liquid-liquid two-phase flow in a horizontal pipe.Numerical results indicate that the calculated interfacial tension of the droplet satisfies well with the Laplace’s law;the droplet relaxes more stably as the increase of viscosity;the droplets fuse faster as the interfacial tension increases.The two-phase interface details can be captured well in those problems.This work lays a solid foundation for further analysis of two-phase flow using lattice Boltzrnann method.更多还原