Numerical Simulation of Mechanical Characteristics of a Metal Net for Deep-Sea Aquaculture
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The investigation on hydrodynamic characteristics of a cage is important for its application in the deep-sea aquaculture in our country. With finite element method, the beam element is used to simulate a three-dimensional metal chain net, and the connector element is introduced as the interaction between metal net lines. A mechanical model for the metal net is constructed to simulate the hydrodynamic characteristics of a metal net subjected to fluid current forces. The static simulation results show that the relative errors of the displacements are 2.13%, 4.19%, 6.64%, and 11.35% compared with static concentrated load tests under concentrated forces of 20, 40, 60, and 80 N, respectively. Both the transient hydrodynamic deformations and drag forces of the netting structures under different current velocities are obtained by solving the hydrodynamic equation of the netting structure. The average relative error of the current forces obtained by numerical simulations shows an 8.13% deviation from the drag tests of the metal nets in the tank under five current velocities. The effectiveness and precision of the simulation approach are verified by static and dynamic tests. The proposed simulation approach will provide a good foundation for the further investigation of the hydrodynamic characteristics of deep-sea aquaculture metal cages and the parameter design for the safety of such cage systems.
Key wordsmetal net finite element method connector element mechanical characteristics numerical simulation
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This work is financially supported by the National Natural Science Foundation (No. 31572663).
- Chen, C. P., Wang, W., Zheng, J. C., Shi, X. Y., and Liu, C. F., 2017. Numerical simulation on the hydrodynamic characteristic of the plane metal net under current. Journal of Dalian Ocean University, 32(3): 363–368 (in Chinese with English abstract).Google Scholar
- Decew, J., Osienski, M., Drach, A., Celikkol, B., and Tsukrov, I., 2013. Effect of the bending stiffness on the volumetric stability of fish cages with copper alloy netting. International Conference on Computational Methods in Marine Engineering. Hamburg, Germany, 1–7.Google Scholar
- Fredheim, A., and Faltinsen, O. M., 2001. A numerical model for the fluid structure interaction of three-dimensional net structure. Proceeding of the 5th International Workshop ‘DEMaT 01’. University of Rostock, Germany, 2.Google Scholar
- Gosz, M., Kestler, K. J., and Swift, M. R., 1996. Finite element modeling of submerged aquaculture net pen system. In: Open Ocean Aquaculture. Maine Sea Grant College Program Rpt. New Hampshire, 523–554.Google Scholar
- Lader, R. F., Fredheim, A., and Lien, E., 2001. Dynamic behavior of 3D nets exposed to waves and current. Proceedings of the 20th International Conference on Offshore Mechanics and Arctic Engineering. Rio de Janeiro, OMAE, 1125.Google Scholar
- Li, L., Fu, S., and Li, R., 2012. Dynamic responses of the floating cage system in current and waves. International Conference on Ocean, Offshore and Arctic Engineering. ASME, 239–248, DOI: https://doi.org/10.1115/OMAE2012-83284.
- Li, Y. C., Gui, F. K., Zhang, H. H., and Guan, C. S., 2005. Simulation criteria of fishing nets in aquiculture sea cage experiments. Journal of Fish Sciences of China, 12(2): 179–187 (in Chinese with English abstract).Google Scholar
- Liu, H., Wang, S., Huang, X., Tao, Q., Hu, Y., Guo, G., and Song, L., 2017. Mechanical property analysis and optimization of deep-water net cage guardrail. Transactions of the Chinese Society of Agricultural Engineering, 33(4): 248–257, DOI: https://doi.org/10.11975/j.issn.1002-6819.2017.04.034 (in Chinese with English abstract).Google Scholar
- Marichal, D., 2003. Cod-end numerical study. Proceedings of Hydroelasticity in Marine Technology. Oxford, 11–18.Google Scholar
- Nie, Z. W., Wang, L., Liu, Y. L., Shi, J. G., Min, M. H., Yu, W. W., Chen, X. W., and Wang, L. M., 2016. Development and application of fishery copper alloy netting. Marine Fisheries, 38(3): 329–336 (in Chinese with English abstract).Google Scholar
- Su, W., and Zhan, J. M., 2007. Computational method for deformation of volume of net structure in current. The Ocean Engineering, 25(1): 93–100 (in Chinese with English abstract).Google Scholar
- Suzuki, K., Takagi, T., Shimizu, T., Hiraishi, T., Yamamoto, K., and Nashimoto, K., 2003. Validity and visualization of a numerical model used to determine dynamic configurations of fishing nets. Fisheries Science, 69(4): 695–705, DOI: https://doi.org/10.1046/j.1444-2906.2003.00676.x.CrossRefGoogle Scholar
- Zhao, Y. P., Li, Y. C., Dong, G. H., Gui, F. K., and Teng, B., 2007. Numerical simulation of the effects of structures ratio and mesh style on the 3D net deformation of gravity cage in current. Aquacultural Engineering, 36(3): 285–301, DOI: https://doi.org/10.1016/j.aquaeng.2007.01.003.CrossRefGoogle Scholar