基于CLSVOF方法的多介质流运动界面追踪(英文)

根据Level-Set方法和VOF方法各自的优缺点,耦合生成一种Level-Set和VOF的耦合界面追踪方法,简称CLSVOF(Coupled Level Set and Volume Of Fluid Method)方法。CLSVOF方法利用Level-Set函数计算VOF体积份额,克服了VOF方法难以准确计算界面的法向量和曲率的缺点;同时又利用VOF体积份额修正Level-Set函数,克服了Lev-el-Set方法在计算过程中有物理量的损失的缺点。用旋转流场和剪切流场的数值算例验证了CLSVOF方法相比VOF方法提高了运动界面追踪的分辨率,相比Level-Set方法实现了计算过程中的物理量守恒。运用CLSVOF方法数值模拟了两个多介质流运动界面算例,分别是自由剪切层问题和气泡在静止水体中上升问题.对比数值模拟结果与理论分析和实验结果可知CLSVOF方法能精确地追踪多介质流运动界面。

A Coupled Level Set and Volume of Fluid Method for Tracking Moving Interface in Multiphase Flow

Based on the advantages and disadvantages of the Level-Set method and the VOF method, a coupled Level-Set and Volume of Fluid (CLSVOF) method is presented. Through using the Level-Set function to computing volumetric fraction, CLSVOF method overcomes the disadvantage of the VOF method, which is the fact that it is difficult to obtain the normal vector and curvature accurately. Through using the VOF volumetric fraction to revise Level-Set function, CLSVOF method overcomes the drawback of the Level-Set method, which is mass loss in computational process. The numerical results of the applied cases validate that the CLSVOF method improves tracking resolution than the VOF method, as well as, realizes mass conservation compared with the Level-Set method. Furthermore, the CLSVOF method is applied to simulate two types of the movement interface in multiphase flow, which are free shear layer and a rising gas bubble in water, respectively. The numerical results are compared with theoretical analysis and experimental data. It is shown that the CLSVOF method can accurately track moving interface in multiphase flow.