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Drag force coefficient and flow field variations of net with different levels of biological fouling under large-eddy simulation

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Abstract

The safety of the offshore net cage and the survival environment of cultured fish are closely related to the net system. Since the damage caused by predators or biological fouling significantly threatens the longevity of the net system, this paper aims to understand the hydrodynamic characteristics of the biological fouling net in the open ocean. First, the equivalent model of the biofouling net is proposed, and the drag force coefficient and flow field variations are studied using large-eddy simulation (LES). The results highlight that the cross-sections contacted with fluid lead to a smaller drag force coefficient for 2 × 2 cruciform circular cylinder. Then, the fitted formula of the drag force coefficient under different biological fouling levels is established. Moreover, the length of recirculation flow is irrelevant with the number of net twines, but it is greatly affected by the biological fouling level. Wake vortices behind the fouling net is more disordered as the biological fouling level increases. Finally, the influence between the net aperture and the net twines on the wake are also accessed in this paper.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (Grant No. 51909040 and 52231011). Research Fund from Stable Supporting Fund of Science and Technology on Underwater Vehicle Technology (Grant No. JCKYS2022SXJQR-11) and the Key Technology Research and Development Program of Shandong (Grant No. 2020CXGC010702) are also greatly acknowledged.

Funding

Funding was provided by National Natural Science Foundation of China, 51909040, Peng Li, 52231011, Peng Li, Stable Supporting Fund of Science and Technology on Underwater Vehicle Technology, JCKYS2022SXJQR-11, Peng Li, and Key Technology Research and Development Program of Shandong, 2020CXGC010702, Peng Li.

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Authors and Affiliations

  1. Science and Technology on Underwater Vehicle Laboratory, Harbin Engineering University, Harbin, 150001, China

    Songchen Yu, Hongde Qin, Peng Li & Fangyu Gong

  2. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China

    Songchen Yu, Hongde Qin, Peng Li & Fangyu Gong

  3. Yantai Research Institute and Graduate School of Harbin Engineering University, Yantai, 264006, China

    Peng Li

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  1. Songchen Yu
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  2. Hongde Qin
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  3. Peng Li
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  4. Fangyu Gong
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Correspondence to Peng Li.

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Yu, S., Qin, H., Li, P. et al. Drag force coefficient and flow field variations of net with different levels of biological fouling under large-eddy simulation. J Mar Sci Technol 28, 506–523 (2023). https://doi.org/10.1007/s00773-023-00937-6

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  • DOI: https://doi.org/10.1007/s00773-023-00937-6

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