Dynamic Response and Flow Field Variation of a Floating Collar Under Extreme Wave Condition Using Computational Fluid Dynamics

Songchen Yu, Peng Li, Hongde Qin, Lingyun Xu
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Abstract

An innovation in aquaculture fisheries around the world is in progress. More and more fish cages have been put into use to meet the needs of human for protein. However, the fish cage shows violent dynamic response and structural destruction while suffering to unpredictable marine environment. As the main component of the cage, floating collar plays an important role in providing buoyancy and ensuring the shape of cage. Thus, the dynamic response of the floating collar and the variation of flow field around the floating collar under extreme wave condition were studied in this paper. Referring to the previous literature, considering the motion form of the floating collar under waves, only the heave and pitch motions of the floating collar were obtained. Results obtained by Computational Fluid Dynamics method were compared with that obtained by potential flow theory. We found that the viscosity of the water has greater influence on heave motion of the floating collar rather than the pitch motion. At the same time, the flow field surrounding the floating collar was analyzed, and an overtopping phenomenon on both sides of the floating collar along the wave propagation direction was observed when the wave was passing through the floating collar.
基于计算流体动力学的极值波浪条件下浮环动力响应及流场变化
世界各地正在进行一项水产养殖渔业创新。为了满足人类对蛋白质的需求,越来越多的网箱被投入使用。然而,在不可预测的海洋环境中,网箱表现出剧烈的动力响应和结构破坏。浮铤作为保持架的主要部件,在提供浮力和保证保持架形状方面起着重要的作用。因此,本文研究了极端波浪条件下浮环的动力响应和浮环周围流场的变化。参考以往文献,考虑到浮领在波浪作用下的运动形式,只得到浮领的升沉运动和俯仰运动。计算流体力学方法计算结果与势流理论计算结果进行了比较。研究发现,水的粘度对浮铤的升沉运动的影响大于对俯仰运动的影响。同时,对浮领周围的流场进行了分析,发现波浪通过浮领时,浮领两侧沿波浪传播方向出现过顶现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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