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二维弹性结构入水冲击过程中的流固耦合效应
引用本文:卢炽华,何友声.二维弹性结构入水冲击过程中的流固耦合效应[J].力学学报,2000,32(2):129-140.
作者姓名:卢炽华  何友声
作者单位:上海交通大学工程力学系,上海,200030
基金项目:国家自然科学基金!19772028,上海市博士后基金!97BSH1409
摘    要:描述了一个研究弹性结构入水冲击过程中水弹性效应的数值方法,在弹性结构入水冲击过程中,流体域作用在结构上的水动力载荷由边界元法获得,而结构的弹性动力响应则由有限元方法求解,通过线性给离散Bernoulli方程将有限元方程和边界元方程耦合到一起,从而获得了求解流场和结构动力响应的相互耦合的运动方程。在数值考虑了自由表面的非线性边界条件,通过引入射流单元以及最大射流厚度,较好地处理了冲击引起的射流问题。

关 键 词:入水冲击  流固耦合  二维弹性结构
收稿时间:1999-7-29

COUPLED ANALYSIS OF NONLINEAR INTERACTION BETWEEN FLUID AND STRUCTURE DURING IMPACT
Lu Chihua,He Yousheng.COUPLED ANALYSIS OF NONLINEAR INTERACTION BETWEEN FLUID AND STRUCTURE DURING IMPACT[J].chinese journal of theoretical and applied mechanics,2000,32(2):129-140.
Authors:Lu Chihua  He Yousheng
Abstract:This paper presents a method for analyzing the hydroelastic interaction during the impact of a structure with water. The completely coupled equation for fluid flow and structural response is solved by the boundary element method (BEM) for the former and by the finite element method (FEM) for the latter. During the impact, the nonlinear free surface boundary condition is satisfied, including proper treatment of the jet, and the full interaction with the linear elastic - structure is taken into account. The convergence of the code is verified by different fluid domain and mesh sizes and different time steps. The accuracy of the code is confirmed by comparing the present results with published data. Various examples of a V--shape structure impacting verticajly upon water are provided. The numerical result from this coupled analysis shows that the hydroelasticity has different effects on the dynamic response of the body with different deadrise angles, which may have some important implications for structural design.
Keywords:impact upon water  fluid-structure interaction Received 30 March 1998  revised 29 July 1999  
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