移动粒子半隐式法模拟入水冲击流固耦合问题  

Simulation of fluid-solid coupling problem during water-entry impact using moving-particle semi-implicit method

作　　者：杨超[1] 张怀新[1] YANG Chao;ZHANG Huai-xin(Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE),State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室高新船舶与深海开发装备协同创新中心

出　　处：《浙江大学学报（工学版）》2018年第11期2092-2097,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51479116;11272213)

摘　　要：利用传统的基于网格信息的方法处理大变形自由表面、液面破损、弹性结构变形等问题时,网格会产生严重的扭曲变形,从而导致较大的计算误差甚至计算终止。移动粒子半隐式(MPS)法是一种无网格拉格朗日计算方法,摆脱了计算网格的约束,抛开了网格重构。在计算过程中不会发生网格变形过大或者网格畸变的问题,适用于处理流固耦合交界面等不连续问题.采用统一的MPS粒子将宏观流体和固体按一定的形式离散,解决统一坐标系的协调问题.在利用传统的网格数值方法计算流固耦合问题时,对流固耦合交界面的处理非常繁琐,而利用MPS法则不需要对流固耦合交界面做单独处理,简化了处理程序.运用MPS法对平底结构入水冲击问题进行流固耦合数值模拟。模拟和实验结果的对比表明MPS法可以很好地应用于冲击入水等不连续问题的数值计算.Meshes may be severely distorted when the traditional methods based on grid information are used to deal with the problems of large deformation free surface,liquid surface breakage and elastic structure deformation.This may lead to large calculation error and even termination of calculation.Moving-particle semi-implicit(MPS)method is one of meshless Lagrangian calculation methods,which uses particles instead of mesh and has advantage in dealing with the discontinuous problems such as fluid-solid coupling interface.The unified MPS particles were used to separate the macroscopic fluid and solid in a certain form to deal with coordination problem in the unified coordinate system.It was cumbersome to handle the fluid-solid coupling interface with the traditional grid numerical method.The MPS method was simple because the treatment for the fluid-solid coupling interface is not needed.The MPS method was used to simulate the water-entry impact of a flat bottom structure.Comparison between simulation and experimental results showed that the MPS method can be well applied to the numerical simulation of the discontinuous problems such as water entry problem.

关 键 词：移动粒子半隐式法 流固耦合 入水冲击 压力振荡 

分 类 号：U66[交通运输工程—船舶及航道工程]