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Numerical simulation of hydrodynamic characteristics of cylindrical hollow artificial reef in wave-current

  

  1. (1 State Key Lab of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
    2 Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China)
  • Online:2022-09-21 Published:2017-04-20

圆柱镂空型人工鱼礁波流水动力特性数值模拟

  

  1. (1大连理工大学海岸和近海工程国家重点实验室，辽宁 大连116024；
    2中国水产科学研究院黄海水产研究所，山东 青岛266071)
  • 通讯作者: 赵云鹏（1980—），男，教授，研究方向：海洋牧场结构物水动力特性。E-mail：Ypzhao@dlut.edu.cn
  • 作者简介:蒋为（1990—），男，硕士研究生，研究方向：海洋牧场结构物水动力特性。E-mail：jiangweizaidagong@mail.dlut.edu.cn
  • 基金资助:
    国家自然科学基金（51239002，51579037）；中国博士后基金(2014M560211，2015T80254) ；中央级公益性科研院所基本科研业务费专项资金项目（2016HY-ZD0103）；中央高校基本科研业务费专项资金（DUT16YQ105）

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Abstract: Researching the hydrodynamic characteristics of artificial reef in wave-current is very important for the design of artificial reef. Based on the finite volume method, adopting the velocity border as a wave generator, a multifunctional 3D-numerical wave-current tank was established by the volume of fluid (VOF) method, which can simulate the hydrodynamic characteristics of the artificial reef under the action of wave, current and wave-current, respectively. Based on this numerical model, the hydrodynamic characteristics of the cylindrical hollow artificial reef under different actions of wave-current was investigated. Compared the numerical results with experimental results，the accuracy of the simulation of forces was verified．The results show that the maximum of the wave-current force of artificial reefs increases with the increase of wave height, period and flow velocity. The simulation results also show that when the artificial reef is directly below the crest of the wave field, the area of wake vortex of the artificial reef increases with the increase of flow velocity, but decreases with the increase of wave height and period. By comparing the hydrodynamic characteristics of artificial reefs under the action of single homogeneous flow, single wave and wave-current, the maximum wave-current force of the artificial reef is greater than the maximum wave force and the water flow force. The simulation results also show that the flow field effect under wave-current interaction is the largest, and a large-scale vortex structure is formed at the rear of the reef.

Key words:  artificial reef, wave-current force, wake vortex, 3D-numerical wave-current tank

摘要： 研究人工鱼礁在波流作用下的水动力特性，对于人工鱼礁的设计具有重要的意义。基于有限体积法，采用边界造波，利用自由表面捕捉法（VOF）捕捉自由水面，建立了可以分别模拟纯波、均匀流以及波流共同作用下人工鱼礁水动力特性的多功能三维数值波流水槽。基于该数值模型对不同波流工况作用下圆柱型镂空人工鱼礁水动力特性进行数值模拟，并与物理模型试验结果进行比较。结果显示，人工鱼礁数值模拟受力与模型试验结果吻合良好，人工鱼礁所受的波流力最大值随着波高、周期和水流流速的增大而增大；人工鱼礁处于波流场波峰正下方时，背涡流的面积随着水流流速的增大而增大，随着波高、周期增大而减小。对单独均匀流作用、单独波浪作用和波流联合作用下人工鱼礁的水动力特性对比研究表明，人工鱼礁所受的最大波流力比最大波浪力、水流力都大，波流联合作用下的流场效应最显著，在礁体的后部形成了较大规模的漩涡结构。

关键词: 人工鱼礁, 波流力, 背涡流, 三维数值波流水槽