摘要
新概念人工海床能够有效提升海上油气开发装备对强风、巨浪和表面强流等海面灾害性海洋环境要素的适应性,但内波产生的巨大冲击载荷是影响人工海床作业安全的关键因素。本文研究内孤立波作用下新概念人工海床水动力载荷及流场特性问题。首先,以eKdV方程为理论模型,采用速度入口造波方法,建立三维内孤立波数值水槽,实现内孤立波的数值造波;在此基础上,对数值造波的波形与理论波形和试验波形进行对比,验证数值方法的有效性;最后,计算内孤立波作用于人工海床的水动力载荷,详细研究不同内孤立波振幅下人工海床的受力特性,分析人工海床周围的速度场和涡量场。研究结果表明:随着内孤立波振幅的增加,人工海床所受的拖曳力、垂向力和升力均逐渐增加,且拖曳力和垂向力远大于升力;当内孤立波经过人工海床时,人工海床周围的流体质点速度增大,涡强度增大。本研究可为大型水下工程结构物的内孤立波载荷预报及流场特性分析提供一种有效的数值计算方法。
The new conceptual artificial seabed can effectively improve the adaptability of disastrous marine environmental factors such as strong winds,huge waves and surface currents,but the considerable impact force generated by internal solitary waves is a key factor affecting the operation safety of the artificial seabed.This paper presents a study on hydrodynamic forces and flow field characteristics of the new conceptual artifi-cial seabed under the action of internal solitary waves.First of all,the eKdV equation was used as the theoret-ical model.A three-dimensional numerical flume was established by using the wave-making method of ve-locity inlet,and the numerical wave-making of internal solitary waves was achieved.On this basis,the nu-merical waveform was compared with the theoretical and experimental waveforms,and the feasibility of the numerical method was verified.Finally,hydrodynamic forces exerted by internal solitary waves on the artifi-cial seabed were calculated,the characteristics of forces induced by internal solitary waves of various ampli-tudes on the artificial seabed were studied in detail.Besides,the velocity field and the vorticity field around the artificial seabed were analyzed.The results show that,with the increase of the amplitude of the internal solitary wave,the drag force,vertical force and lift force on the artificial seabed gradually increase,and the drag force and vertical force are much greater than the lift force.When the internal solitary wave passes through the artificial seabed,both the particle velocity of the fluid and the vortex intensity around the artifi-cial seabed increase.This study provides an effective numerical calculation method for the prediction of inter-nal solitary wave forces and the analysis of flow field characteristics of large underwater engineering struc-tures.
作者
姚金江
甄兴伟
段秋阳
黄一
YAO Jin-jiang;ZHEN Xing-wei;DUAN Qiu-yang;HUANG Yi(School of Naval Architecture and Ocean Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《船舶力学》
EI
CSCD
北大核心
2024年第6期818-831,共14页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(52171249)
辽宁省自然科学基金项目(2023-MS-117)
中央高校基本科研业务费资助项目(DUT22LK26)。
关键词
内孤立波
人工海床新概念
数值造波
水动力
试验验证
internal solitary wave
new conceptual artificial seabed
numerical wave-making
hydrodynamic force
test verification
