两相方腔流的格子Boltzmann模拟

Lattice Boltzmann Simulation of Multiphase Flows in a Square Cavity

利用基于Shan-Chen多相模型的格子Boltzmann方法对方腔内上板拖动的两相流动问题开展较为系统的数值模拟,详细研究雷诺数(Re),毛细数(Ca)和壁面润湿性对流动以及混合特性的影响.结果表明:Re数、Ca数越大,方腔内两相流体的混合界面长度越大,混合效果越好.另外,壁面憎水程度越高,混合界面长度增加越快,然而对于强亲水壁面,混合界面长度最终趋于一常数.

Lattice Boltzmann multiphase method based on Shan-Chen model is used to a systematic study on dynamics of two-phase fluid flows in a lid-driven square cavity. Effects of Reynolds （ Re ）, Capillary number （Ca） and surface wettability on flowing and mixing are investigated in details. It shows that the greater the Re and Ca, the longer pength of two phase fluid mixing interface in the cavity. In addition, the length of mixing interface increases with surface hydrophobicity. However, for a highly hydrophilic surface, the length of mixing interface tends to a constant finally.