圆柱体出水运动的自由面效应及水冢现象分析  

Free Surface Effect and Spike of a Cylinder Piercing Water Surface

作　　者：孙士丽[1] 孙义龙[2] 胡竞中 胡健[4] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]中国船舶重工集团公司第七〇一研究所上海分部,上海200240 [3]上海外高桥造船有限公司,上海200137 [4]哈尔滨工程大学船舶工程学院,哈尔滨150001

出　　处：《计算物理》2013年第2期187-193,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11102048)资助项目

摘　　要：以圆柱体为例,研究自由面附近刚性物体的受力状态,分析垂直运动圆柱体出水时的自由面效应以及水冢现象.建立基于势流理论考虑自由面效应的数学模型,并用边界元方法求解该模型.求解过程中考虑非线性自由面运动学以及动力学边界条件.通过求解控制方程以及边界条件,模拟恒速刚性圆柱体出水时的水冢现象及其穿越水冢过程.通过数值解和实验值的比较验证方法的可靠性.分析结构出水时的压力变化、自由液面变形、圆柱体所受的垂向合外力以及流场速度矢量的变化,并展开讨论.结果表明:考虑自由面效应的非线性方法能够更准确地预报自由面附近刚性运动物体的受力特性.To analyze force of fluid on a rigid object near free surface, a mathematical model with free surface effect is developed based on potential flow theory. It is calculated with boundary element method. Nonlinear kinematic and dynamic boundary conditions are taken into consideration. With control equation and boundary conditions, piercing cylinder through free surface and phenomena of spike are simulated. A comparison between numerical and experimental results shows that the method is appropriate. Pressure on moving objects, transform of free surface, resultant hydrodynamic force and velocity of flow field are analyzed in detail. It shows that the nonlinear method with free surface effect predicts precisely force on moving objects in vicinity of free surface.

关 键 词：圆柱体 自由面效应 水冢 边界元方法 

分 类 号：U661.1[交通运输工程—船舶及航道工程]