中文摘要：

引言对于非稳态两相流问题,数值求解方法主要有颗粒轨道模型、双流体模型和运动界面追踪技术,其中运动界面追踪技术最能准确、全面地反映两相间的信息。在运动界面追踪技术中VOF（volumeof fluid）方法[1]和Level Set方法[2]得到了最广泛的使用。

英文摘要：

For unsteady two-phase flows,the widely-used numerical approaches for solving continuity and momentum equations are fractional-step method and SIMPLE-family algorithms.The advantage of the fractional-step method is that the convergence rate is fast and the disadvantage is that the initial value problem is conditional stability.The SIMPLE-family algorithms are absolute stability for the initial value problem;however,their convergence rates are slow.For overcoming the disadvantage of the traditional SIMPLE-family algorithms,IDEAL algorithm was introduced.The convergence rates of SIMPLE-family and IDEAL were compared by two unsteady two-phase flow problems.It was found that IDEAL could enhance the convergence rate greatly,about 6—87 times over SIMPLE-family.Therefore,it could be concluded that IDEAL overcame the disadvantages and combined the advantages of the fractional-step method and the SIMPLE-family algorithms.