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Experimental investigations on hydrodynamic interactions between the cylinder and nets of a typical offshore aquacultural structure in steady current

文献类型： 外文期刊

作者： Wang, Hanbin 1 ; Zhang, Xueyan 1 ; Zhang, Xiantao 1 ; Li, Xin 1 ; Tian, Xinliang 1 ; Shen, Yugao 3 ; Song, Wei 4 ;

作者机构： 1.Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China

2.SJTU Yazhou Bay Inst Deepsea Technol, Sanya 572000, Hainan, Peoples R China

3.Norwegian Univ Sci & Technol, Dept Marine Technol, N-7491 Trondheim, Norway

4.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

关键词： Aquacultural structure; Cylinder -net structure; Hydrodynamic characteristics; Drag coefficient; Lift coefficient; Steady current

期刊名称：MARINE STRUCTURES （ 影响因子：3.9； 五年影响因子：4.1 ）

ISSN： 0951-8339

年卷期： 2023 年 88 卷

页码：

收录情况： SCI

摘要： A series of physical experiments were performed in steady current to investigate the hydrodynamic interactions between the cylinder and nets which constitute a main part of offshore aquacultural platforms. The hydrodynamic characteristics of only the cylinder, only nets and combined cylinder-net structures are measured and analyzed systematically under different current velocities, inflow angles and solidity ratios of nets. Based on experimental data, fitted formulas for hydrodynamic coefficients of a single resin net are proposed and compared to previously published empirical formulas. It is observed that the existence of the cylinder brings an increment up to 9.2% to drag coefficient of net panels whose solidity ratios are higher than 0.347, whereas this effect is negligible for nets with lower solidity ratios and perpendicular to the inflow. For nets inclined with 45 degrees, the increment of the drag coefficient of net panels due to the existence of the cylinder is more significant (up to 22.9%) than that for perpendicularly placed nets. Furthermore, the existence of nets also leads to a noticeable increase in the drag coefficient of the cylinder, up to 40.18% for a relatively large net solidity ratio of 0.458, representative of biofouling condition. The increment increases with the rise of the solidity ratio of nets and it is larger for nets placed perpendicularly to the inflow than inclined. Effects of the cylinder and nets on lift coefficients of each other are a bit complicated, leading to an increase or reduction of lift coefficients depending on the inflow velocity, inflow angle and net solidity ratios. Finally, it is worth noting that the hydrodynamic interaction between the cylinder and nets deserves to be considered in current practice of hybrid methods by combining potential flow theory, Morison and screen models for aquacultural structures, especially for biofouling conditions.

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