论文部分内容阅读
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.
Lattice Boltzmann method with mesoscopic characteristics can capture the details of phase interface accurately and conveniently and has wide application prospect in the field of two-phase flow.Based on the introduction of lattice Boltzmann method and the color model of lattice Boltzmann method, Laplace law of interfacial tension, single droplet relaxation process, two droplet fusion processes and immiscible liquid-liquid two-phase flow in the horizontal channel were investigated.The results show that the interfacial tension of the droplet accords with Laplace’s law; The larger the viscosity, the more stable the droplet relaxation process. The larger the interfacial tension, the faster the droplet fusion rate. Lattice Boltzmann method can effectively describe the boundary of liquid-liquid two-phase flow. The research laid the theoretical foundation for the application of lattice Boltzmann method to analyze two-phase flow problems.