摘要
通过数值模拟与模型实验相结合的方法,对使用双层网衣的坐底式养殖网箱进行了研究.数值模拟中基于多孔介质方法将网衣简化为多孔介质板,将管架处理为刚性壁面,结合Realizable k-ε湍流模型计算了不同流速、来流方向及缺失网衣等情况下网箱流场的变化情况,并与水池实验结果进行了对比分析.结果表明:数值计算结果与实验结果有较好的一致性,双层网衣对流速的衰减效果明显,流速在网箱附近会急剧变化,并在网箱下游形成一个低速区;侧网的存在会加快中间立柱的尾涡脱落,而底网对流速的影响较小;来流方向变化对网箱流速分布的影响较大.工程应用中网箱管架尺寸不宜过大以避免尾涡对结构的潜在影响.
A combined approach of numerical simulation and physical model experiments was employed to investigate the hydrodynamic behaviour of a bottom-fixed aquaculture cage equipped with double-layer nets.In the numerical simulation,the fishing net was simplified as porous media panels using the porous media model,and the frame structure was treated as a rigid wall.The flow field distributions under different inflow velocities,incident angles,and the absence of fishing nets were simulated based on the Realizable k-εturbulence model.The numerical results were subsequently validated against physical measurements obtained from wave tank experiments,demonstrating good agreement between the two approaches.The findings indicate that double-layer nets significantly attenuate flow velocity,leading to sharp velocity gradients near the cage and forming a low-velocity zone in the downstream region.The presence of side nets was found to accelerate the shedding of wake vortices behind the central column,while bottom nets exhibited a relatively small impact on the flow velocity.Furthermore,the variation in incident wave direction had a relatively large impact on the velocity distribution inside and around the cage.From an engineering perspective,excessive structural dimensions of the cage framework should be avoided to minimize potential vortex-induced loads.
作者
吉健
周利兰
刘斌
徐磊
JI Jian;ZHOU Lilan;LIU Bin;XU Lei(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Green and Smart River-Sea-Going Ship,Cruise and Yacht Research Center,Wuhan University of Technology,Wuhan 430063,China;Rizhao Gangda Shipbuilding Heavy Industry Co.Ltd.,Rizhao 276826,Shandong China)
出处
《华中科技大学学报(自然科学版)》
北大核心
2025年第7期151-157,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金面上项目(52271326)
中国国家留学基金委资助项目(202306950024)。
关键词
多孔介质
坐底式养殖网箱
流场
网衣
流速衰减
porous media
bottom-supported aquaculture platform
flow field
fishing net
velocity reduction
