结构物运动引起的冲击自由液面过程，如砰击、液舱晃动、物体出入水是船舶海洋、航空航天、海岸工程中常见的现象，在此冲击过程中，不仅物体会产生变形，而且自由液面也会产生大幅度波动，因此在计算自由表面冲击载荷时需要考虑流固耦合的影响。本项目准备在申请者已有大涡模拟移动粒子半隐式方法研究的基础上，将物体当作弹性结构，流体和固体均采用拉格朗日形式进行处理，弹性体壁面的控制方程也使用移动粒子法来进行离散，通过流体和结构耦合求解，分析物体的位移、变形与自由表面随时间的变化历程，计算大变形自由表面下的冲击载荷，深刻揭示自由表面与弹性结构耦合作用下复杂现象的力学机制，开发有效地确定瞬时自由表面和受力情况的无网格方法计算机软件系统，为今后船舶、海洋、海岸等领域的高科技发展奠定理论基础。

The process of impact with free surface , for example as slamming, sloshing and water entry, often occur phenomena in ship and ocean, aerospace, coastal and offshore engineering. In the impact process, not only the structure would be deformed, but also a large magnitude fluctuation will be produced on the free surface of the water. It is necessary to consider effect of fuild structure interaction within calculation of impact loads with free surface. In this study, a particle method will be developed for fluid structure interaction based on our previous research of Moving-Particle Semi-Implicit Method (MPS). The object as elastic structures are analyzed by the present method.The elastic structures are represented by particles in Lagrangian approach, as same as MPS method for fluid dynamics, The spatial derivatives of governing equations for solid are discretized by the particle interaction models for differential operators. In this study, the iteration procedure of MPS method coupled with solid-fluid interation was used to calculate the displacement and deformation of structure, wave elevations of free surface with time history. The work is particularly useful to more clarify of complex mechanism of fluid structure interaction with free surface and to develop a computer softwave about determination of instantaneous profile of free surface and body forces. It may has very wide applications in ship, ocean and offshore engineering.