中文摘要：

为实现对复杂运动界面的精确描述，本文对多流体碰撞复杂界面问题进行了深入的研究。以欧拉方程的黎曼解为基础，采用MUSCL格式，在现有的FronTier软件包中加入了新的函数和变量，以达到完成复杂界面的计算。FronTier软件包是基于界面追踪方法编写的，可以完成界面不稳定性问题在简单界面情况下的计算。文中的方法成功实现了多流体碰撞复杂界面的计算，计算结果与实际碰撞过程相符。

英文摘要：

To describe the complex moving interface accurately, the interface problem of multiple fluid collision is studied. FronTier code is added into some new functions and variables in this code with MUSCL scheme based on the Riemann solvers of Euler equation. The FronTier software is programmed based on the method of front tracking to solve the interface instability problems with the simple interface. The method modified in this paper can be used to calculate complex interface problems of multiple fluid collision. Numerical results are in agreement with the real process of the collision.