复杂多相流涡结构的拉格朗日拟序分析

In this paper, the complex multiphase flow structure characteristic and mechanism is studied in this research. Lagrangian coherent structures (LCS) is utilized to investigate the flow structures and characteristics. It is revealed that at initial time of the ventilated process, two vortexes form at the left and right side of the bubble hose symmetrically. During the development stage, the bubble hose and the vortexes are swinging periodically. It is also shown that vorticity ? is unable to embody the variation of vortexes with time effectively. The distribution of Q can capture the core of vortices. The Lagrangian coherent structures have the potential to identify the boundary of vortexes and the interface between the forward anLagrangian Coherent Structures and Vortexes Analyses of Complex Multiphase Flowd backward flows inside the liquid region. The results also indicate the divergence extent of particles under the effect of the flow field.