波流作用下平面网衣水动力特性数值模拟  

Numerical simulation of hydrodynamic characteristics of the plane net under waves and currents

作　　者：李娜 李昕[1,2] 施伟 柳春光[1,2] LI Na;LI Xin;SHI Wei;LIU Chunguang(Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Deepwater Engineering Research Center,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学建设工程学部工程抗震研究所,辽宁大连116024 [2]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 [3]大连理工大学深海工程研究中心,辽宁大连116024

出　　处：《上海海洋大学学报》2024年第2期509-519,共11页Journal of Shanghai Ocean University

基　　金：国家自然科学基金(51939002)。

摘　　要：针对固定在钢框架上的平面网衣水动力特性进行研究,基于SACS,采用有限元Member单元建立网衣水动力荷载计算模型,利用参考文献中分别使用有限元Truss单元和Beam单元所建立模型的计算结果对该模型进行了验证。通过对比得出,在SACS中所建立的平面网衣数值模型可以较为准确地计算网衣在波流下的水动力,初步证明了在SACS中建立大型钢结构养殖网箱+固定式海上风力机融合结构模型的可行性。进一步采用该数值计算模型对不同波流工况下网衣结构的水动力荷载进行计算,分析不同流速、波高和波周期下网衣受力的分布规律。由计算结果可知,随着海流流速、波高的减小和波周期的增大,网衣受到的水动力荷载呈现出逐渐减小的变化趋势,其中波周期的影响尤为显著,由于该参数的影响使得指定位置节点水动力荷载误差达80%;另外,波流作用下网衣结构受到的水动力荷载,最大受力位于网衣顶端两侧位置,波高对网衣上部受力影响更大。这些结果可为融合结构中网箱部分的设计提供参考。To conduct research on hydrodynamic characteristics of the plane netfixed on steel frame,a finite element model of the plane net was established with member elements to calculate hydrodynamic loads based on SACS.Comparing the previous calculation results of the truss model and those of the beam model,it is found that the simulation results are similar,which proves that the member model is accurate.This preliminarily study proves the feasibility of simulating the integrated structure that is consists of fixed offshore wind turbine and large steel aquaculture cage in SACS.Furthermore,the member model was used for hydrodynamic loads calculation of the plane net under wave and current.The results show that current velocity,wave height and wave period have a significant effect on the hydrodynamic loads on the plane net.Within the decrease of current velocity,wave height and the increase of wave period,the hydrodynamic load on the net decreases.The influence of wave period is particularly significant,with the certain nodal force difference of up to 80%.For the hydrodynamic load on the net under the action of wave and current,the maximum load appears on both sides of the top position of the plane net,and the wave height has a greater influence on the load at the upper position.These results are expected to provide theoretical basis and technical support for the design of large steel cage in the integrated structure.

关 键 词：平面网衣 水动力荷载 波流作用 有限元法 Morison模型 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]