考虑射流分离现象的二维非对称楔形体入水砰击  

Simulation of Water Entry of a Two-dimensional Asymmetric Wedge with Flow Detachment

作　　者：王文丽 孙士艳 鲍超明 WANG Wenli;SUN Shiyan;BAO Chaoming(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,镇江212100

出　　处：《中国造船》2023年第5期67-77,共11页Shipbuilding of China

基　　金：国家自然科学基金项目(52271276);江苏省自然科学基金项目(BK20201006)。

摘　　要：基于不可压缩势流理论,研究二维有限高度楔形体以给定速度进入静水的问题,并考虑了射流分离现象。在时域上应用边界元法,在给定的非线性边界条件下求解,并利用辅助函数求解物面压力。在初始入水阶段,只有很少一段物体进入水中,为使对流场细节的描述更加精细,采用拉伸坐标系放大该阶段的计算域,当入水距离增加到给定值时,重新在原坐标系中完成后续计算。数值计算结果显示了楔形体底升角、弗劳德数、水平速度和物面边界长度对入水过程的影响。Based on the potential flow theory of the incompressible fluid,the hydrodynamic behavior of a two-dimensional finite wedge entering calm water at a prescribed speed is investigated with consideration of flow detachment.The boundary element method with fully nonlinear boundary conditions is adopted in time domain.An auxiliary function is used to calculate the pressure on the body surface.At the initial stage of the entry,only a small segment of the wedge enters the water.The stretched coordinate is used to enlarge the computational domain in the initial stage.After that,the simulation is done in the original system.Effects of deadrise angle,Froude number,horizontal velocities,and the length of the wedge on the water entry are discussed in detail.

关 键 词：入水 边界元法 完全非线性边界条件 拉伸坐标系 

分 类 号：U661.1[交通运输工程—船舶及航道工程]