基于黏性流体-柔性结构耦合的波浪中船舶非线性波激振动研究  

Research on Nonlinear Springing of Ship in Waves Based on Viscous Fluid-Flexible Structure Interaction

作　　者：屈毫拓 俞俊 陆晔[1] 倪歆韵[1] 叶永林[1] 田超[1] QU Haotuo;YU Jun;LU Ye;NI Xinyun;YE Yonglin;TIAN Chao(China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,无锡214082

出　　处：《中国造船》2023年第5期1-12,共12页Shipbuilding of China

基　　金：工信部高性能船舶科研资助项目(2019[360])。

摘　　要：波激弹振和砰击颤振是集装箱船运营中极易出现的两种现象,分析其对船舶运动和剖面载荷的影响,对船舶设计和强度评估具有重要意义。采用黏性流体-柔性结构双向耦合方法对集装箱船模型在不同波长工况下的运动和响应进行求解,其中计算流体力学用于模拟流场的冲击和上浪等非线性现象并得到船体外载荷,然后通过有限元法求解船体运动和变形,两者在流固交界面进行隐式信息交换。计算捕捉到船体的非线性波激振动和颤振,分析结果发现,波激振动和颤振对整体运动影响较小,但会显著增大船体中垂的弯矩幅值,艏、艉区域垂向加速度受颤振的影响较大,当遭遇波浪的倍频成分接近船体湿频率时也会激发船体一定程度的弹振。与文献结果的比较表明,该耦合方法有望成为处理船舶水弹性问题的一种有效手段。Springing and whipping are two phenomena that are highly susceptible to occur in container operation.Analysis of their effects on ship motion and section loads is of great significance to ship design and strength assessment.A two-way coupling method of viscous fluid-flexible structure is used to solve the motion and response of container ship model under different wavelength conditions,where CFD is used to simulate the impact,green water and other nonlinear phenomena of flow field and obtain the external hull load,and then the hull motion and deformation are solved by finite element method(FEM),and they exchange information in the fluid-structure intersection with implicit algorithm.The calculation captures the nonlinear springing and whipping of the hull.Through the analysis results,it is found that the springing and whipping have less effect on the ship motion,but significantly increase the amplitude of the vertical bending moment in the sagging of the hul,and the vertical acceleration in the bow and stern is more affected by the whipping.When the frequency doubling component of the encountered wave is close to the wet frequency of the hull will also excite a certain degree of elastic vibration.Through the verification with the literature results,the coupling method is expected to be an effective method to deal with the ship hydroelasticity problem.

关 键 词：流固耦合 船舶水弹性 非线性波激振动 砰击颤振 波浪载荷 

分 类 号：U661.1[交通运输工程—船舶及航道工程]