Experimental investigations on hydrodynamic interactions between the cylinder and nets of a typical offshore aquacultural structure in steady current |
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| Affiliation: | 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. SJTU Yazhou Bay Institute of Deepsea Technology, Sanya, Hainan, 572000, China;3. Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, 7491, Norway;4. East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200090, China;1. Shanghai Engineering Research Center of Marine Renewable Energy, College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, China;2. University of Stavanger, Norway;1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. gMarine, Houston, TX, USA;3. China Ship Scientific Research Center (CSSRC), Wuxi, 214082, China;1. College of Safety and Ocean Engineering, China University of Petroleum-Beijing, 18 Fuxue Road, Changping, Beijing, 102249, PR China;2. Engineering& Design Institute of CNPC Offshore Engineering Company Limited, Beijing, 100028, PR China;3. Faculty of Materials and Chemical Engineering,Yibin University, Yibin 644000, Sichuan, PR China;1. Department of Ocean Space Operations and Construction Engineering, Norwegian University of Science and Technology, Norway;2. Department of Marine Technology, Norwegian University of Science and Technology, Trondheim 7049, Norway;3. Department of Engineering Sciences, University of Agder, N-4898, Grimstad, Norway;4. School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, China;5. Seacraft AS, 6010,.Ålesund, Norway;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, No. 2 Linggong Road, Dalian, 116023, China;2. College of Mechanical and Electrical Engineering, Harbin Engineering University, No. 145 Nantong Street, Harbin, 150001, China |
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| Abstract: | 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°, 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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| Keywords: | Aquacultural structure Cylinder-net structure Hydrodynamic characteristics Drag coefficient Lift coefficient Steady current |
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