俞嘉臻,张显涛,李欣.聚焦波作用下平面网衣结构的水动力特性研究[J].海洋工程,2022,40(5):98~110
聚焦波作用下平面网衣结构的水动力特性研究
Numerical study on the hydrodynamic characteristics of a net structure under focused wave groups
投稿时间:2021-10-08  
DOI:10.16483/j.issn.1005-9865.2022.05.011
中文关键词:  网箱养殖结构  平面网衣  多孔介质模型  聚焦波  CFD  水动力特性
英文关键词:aquacultural structure  net  porous media model  focused wave groups  CFD  hydrodynamic characteristics
基金项目:海南省三亚崖州湾科技城管理局重点项目(SKJC-2020-01-006);海南省自然科学基金项目(520QN290);海南省科技计划三亚崖州湾科技城自然科学基金联合项目(2021JJLH0062)
作者单位E-mail
俞嘉臻 上海交通大学 海洋工程国家重点实验室, 上海 200240
上海交通大学三亚崖州湾深海科技研究院, 海南 三亚 572000 
 
张显涛 上海交通大学 海洋工程国家重点实验室, 上海 200240
上海交通大学三亚崖州湾深海科技研究院, 海南 三亚 572000 
zhxt@sjtu.edu.cn 
李欣 上海交通大学 海洋工程国家重点实验室, 上海 200240
上海交通大学三亚崖州湾深海科技研究院, 海南 三亚 572000 
 
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中文摘要:
      由于沿海区域的限制以及愈加严重的环境污染,渔业养殖正从近海走向深远海。深远海海域的海况更加恶劣,给养殖装备的设计与性能评估带来新的挑战。为解决该问题,对极端波浪与养殖装备网衣结构的相互作用开展研究。基于waves2Foam建立数值波浪水池,极端波浪模拟采用基于NewWave理论的聚焦波模型,网衣结构模拟采用多孔介质模型,并通过与Morison模型计算的网衣受力等效分析,获得多孔介质模拟网衣结构阻力系数的直接估计方法。然后将多孔介质模型嵌入waves2Foam中,开展聚焦波与网衣结构相互作用的数值模拟,同时开展水槽试验,验证数值模拟的准确性。基于数值模拟结果,系统地分析了不同网衣密实度及不同波浪参数下网衣结构的升阻力特性以及网衣结构对波浪场的扰动规律。研究表明:聚焦波波峰幅值和网衣密实度对网衣结构的升阻力影响较大,且升力峰值出现在阻力为0的时刻;网衣结构对聚焦波的时空演化特性有影响,改变了聚焦波波形。
英文摘要:
      Due to the limitation of coastal areas and more serious environment pollution, aquaculture is moving from nearshore to offshore regions. The worse sea state in the open sea area brings new challenges to the design of aquacultural structures. Therefore, this research intends to study the interaction between extreme waves and the net of aquacultural structures. A numerical wave tank is established based on waves2Foam, in which the extreme wave is represented by the NewWave type focused wave groups and the net structure is modelled by the porous media model. For the net structure, a direct approach is derived for estimation of hydrodynamic resistance coefficients of porous media based on its equivalence with the Morison force model. Then the porous media model is embedded in waves2Foam to carry out the numerical simulation of the interaction between focused wave groups and the net structure. Based on the numerical results, the drag and lift forces of the net structure under different net solidities and wave parameters, as well as the disturbance of wave field by the net structure, are analyzed systematically. Results show that both the drag and lift forces of the net structure are significantly affected by the peak crest of the focused wave group and the net solidities. For a given wave excitation, the peak of the lift force appears when the drag force is zero. It is also found that the existence of a net structure alters the spatio-temporal evolution characteristics of the focused wave group, changing the wave shape.
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