基于VOF方法的半封闭圆柱入水受载和运动特征  

Load and Motion Characteristics of Semi-Enclosed Cylinder Water Entry Based on VOF Method

作　　者：文华东 汪子钊 WEN Huadong;WANG Zizhao(CCCC Second Harbor Engineering Co.,Ltd.,Wuhani 430040,China;Key Laboratory of Large-Span Bridge Construction Technology,Wuhan 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040,China)

机构地区：[1]中交第二航务工程局有限公司,武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,武汉430040 [3]交通运输行业交通基础设施智能建造技术研发中心,武汉430040

出　　处：《船舶工程》2025年第3期145-151,共7页Ship Engineering

摘　　要：[目的]与传统的实心圆柱形入水过程相比,开放空腔圆柱形结构的入水过程更为复杂,对其入水机理的研究对类似结构的设计具有重要指导意义。[方法]采用流体体积法(VOF)对开放空腔圆柱的入水机理进行研究,对其在入水过程中的载荷和运动特征进行分析。基于计算流体力学(CFD)方法,以现有试验数据为基准,进行网格不确定性分析,验证该数值方法的准确性。在此基础上,研究不同入水角度下半封闭圆柱的入水过程,评估入水角度对半封闭圆柱所受载荷和运动特征的影响。[结果]研究结果表明:减小入水角度能有效降低圆柱表面的接触载荷;在半封闭圆柱入水过程中,圆柱两侧不对称的气泡空腔会导致横向速度出现短暂波动,波动幅值随入水角度的增大而减小,同时圆柱内部空气压力发生波动会导致圆柱的横向速度和竖向速度出现周期性波动,该波动受入水角度的影响较小,在各入水角下均较为明显。[结论]该研究可供类似结构的声呐浮标和某些水下机器人的结构设计参考。[Purpose]Compared with the traditional solid cylindrical water entry process,the open cavity cylindrical structure has a more complex water entry process,and the study of its water entry mechanism has important guiding significance for the design of similar structures.[Method]The volume of fluid(VOF)method is used to study the water entry mechanism of an open cavity cylinder,and its load and motion characteristics during the water entry process are analyzed.Based on the computational fluid dynamics(CFD)method and using existing experimental data as a benchmark,a grid uncertainty analysis is performed to verify the accuracy of the numerical method.On this basis,the water entry process of a semi-enclosed cylinder at different inlet angles is studied,and the influence of the inlet angle on the load and motion characteristics of the semi-enclosed cylinder is evaluated.[Result]The research results indicate that reducing the water inlet angle can effectively reduce the contact load on the cylindrical surface;during the water entry process of a semi-enclosed cylinder,asymmetric bubble cavities on both sides of the cylinder can cause brief fluctuations in the lateral velocity,with the amplitude of the fluctuations decreasing as the water inlet angle increases.At the same time,fluctuations in air pressure inside the cylinder can cause periodic fluctuations in both lateral and vertical velocities,which are less affected by the water inlet angle and are more pronounced at each angle.[Conclusion]The research can serve as a reference for the structural design of sonar buoys with similar structures and certain underwater robots.

关 键 词：半封闭圆柱入水 流体体积法(VOF) 空腔演化 流体载荷 

分 类 号：U666[交通运输工程—船舶及航道工程]