基于WCSPH-SPIM流固耦合模型的弹性体入水模拟  

Numerical simulation of the water entry of an elastomer by using the WCSPH-SPIM coupled method

作　　者：施书文 张桂勇[1,2,3] 王双强 胡泰安 SHI Shuwen;ZHANG Guiyong;WANG Shuangqiang;HU Taian(Liaoning Engineering Laboratory for Deep-Sea Floating Structures,School of Naval Architecture,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)

机构地区：[1]大连理工大学船舶工程学院辽宁省深海浮动结构工程实验室,辽宁大连116024 [2]大连理工大学工业装备与结构分析国家重点实验室,辽宁大连116024 [3]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《振动与冲击》2020年第18期103-108,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51579042);工信部高技术船舶科研项目(2017-614);中央高校基本科研业务费专项基金(DUT2017TB05)。

摘　　要：对于入水砰击这类强非线性问题,运用网格方法不可避免会发生网格畸变、自由液面捕捉不准确等问题,而拉格朗日型无网格方法在处理该类问题时展现出很强的优越性。针对这一特点,采用两种无网格方法分别作为流体与固体求解器、建立流固耦合模型模拟入水问题;在通过刚性体入水问题对弱可压光滑粒子水动力法(WCSPH)进行验证之后,采用新提出的弱可压光滑粒子水动力与光滑点插值(SPIM)流固耦合方法(WCSPH-SPIM)分别对弹性体低速和高速入水问题进行了计算。结果显示关键点处变形与压力随时间的变化情况都与试验值或半解析解吻合良好,证明了该方法对模拟弹性体入水问题的有效性。Considering the strong nonlinear characteristics of the water entry problem,the grid-based method will inevitably encounter the difficulties in grid distortion and inaccurate liquid surface capture.However,the Lagrangian meshless method has shown strong advantage when dealing with this type of problems.Making use of this merit,a fluid-structure interaction(FSI)model was built to simulate the water entry by using two meshless methods as the fluid and solid solver respectively.After verifying the effectiveness of the weakly compressible smoothed particle hydrodynamics(WCSPH)method to solve the water entry of a rigid body,the water entry problem of an elastomer with low and high speeds was studied using the newly proposed WCSPH integrated with the smoothed point interpolation method(WCSPH-SPIM).The calculation results show that the deformations at key points and the change of pressure with time are in good agreement with those of experiment or semi analytical solutions,which verifies the efficiency of the proposed method on the simulation of water entry.

关 键 词：弱可压光滑粒子水动力法(WCSPH) 光滑点插值方法(SPIM) 流固耦合(FSI) 入水 

分 类 号：O353.4[理学—流体力学]