基于OpenFOAM的全潜式网箱网衣系缚方式研究  

Study on fixing modes of netting for the fully submerged cage based on OpenFOAM

作　　者：朱传之 杨永春[1] 黄六一[2] 王刚 ZHU Chuanzhi;YANG Yongchun;HUANG Liuyi;WANG Gang(College of Engineering,Ocean University of China,Qingdao 266100,China;College of Fisheries,Ocean University of China,Qingdao 266003,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100 [2]中国海洋大学水产学院,山东青岛266003

出　　处：《中国水产科学》2021年第8期1079-1090,共12页Journal of Fishery Sciences of China

基　　金：国家重点研发计划项目(2019YFD0901003).

摘　　要：本研究针对全潜式网箱的四周刚性柱-网衣系缚方式进行研究。通过模型实验测得柱-网结构模型在水流作用下,不同流速、不同系缚方式下的网衣系缚点受力,分析了不同系缚方式对网衣系缚点受力分布特性以及系缚点之间受力均匀性的影响。此外,为进一步研究网衣系缚方式对周围流场的影响,本研究基于混合体积法建立了网衣的流固耦合模型,并在开源CFD软件OpenFOAM中开发得到了网衣流固耦合求解器,通过数值模拟与模型实验相结合的方式研究了网衣的阻流效应以及网衣网线的张力分布特征和荷载传递方式。研究结果表明,四周刚性柱-网结构模型中,网衣系缚方式对水流作用下网衣的受力特性有着显著的影响,网衣最大张力一般分布在与系缚点相连的网线上,而且越靠近中间位置的网线和系缚点的受力也越大,整体呈现出两端受力小中间受力大的对称现象;在网衣背流侧,靠近网衣沿水流方向投影的中心位置处流场受网衣阻流效应的影响会偏大,流速衰减率也更高,而且在同种工况下,随着流速的变大,网衣对流场流速的衰减效应也越明显。This paper studies the fixing modes of netting for the fully submerged cage. The forces on the tie points of column-net structure model under different current velocities and fixing modes were measured using physical model tests. The effects of different fixing modes on the force distribution characteristics on net tie points and the uniformity of forces among the tie points were analyzed. In addition, for further study of the interaction between the net fixing mode and surrounding water, this paper builds a fluid-structure coupling model of the net based on a hybrid volume method, and develops the fluid-structure coupling solver in the open source CFD software OpenFOAM. The influence of the net on the current velocity reduction, the tension distribution characteristics of the net and the transmission of load were studied through the combination of numerical simulation and model tests. The results showed that the fixing mode of the net has a significant influence on the force characteristics of the net in the column-net structure model. The maximum net tension is generally distributed on the net twines connected to the tie points. Additionally, the closer to the middle position the net twines are, the greater the force, showing a symmetry phenomenon in that force of the tie points at the two ends was small while that in the middle was large. The current velocity in the downstream near the normal line at the center of net was affected by reducing the net flow, and the velocity attenuation rate was also increased. These results can provide references for the design, construction, and safety performance evaluation of deep-sea cages.

关 键 词：全潜式网箱 系缚方式 模型实验 OPENFOAM 网衣流固耦合 

分 类 号：S972[农业科学—捕捞与储运]