An improved Morison hydrodynamics model for knotless nets based on CFD and metamodelling methods

Huang, Liuyi; Li, Yuyan; Wang, Gang; Wang, Yongjin; Wu, Qing; Jia, Mingxiu; Wu, Rong

doi:10.1016/j.aquaeng.2021.102220

Cited by 16 publications

(4 citation statements)

References 52 publications

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“…The netting wire can be treated as slender rods that satisfy the requirements for applying the Morison equation [51]. Based on the Morison equation, the wave load on the netting is predominantly governed by drag force rather than inertia force, owing to the small diameter of the netting wire, typically ranging from 3 to 5 mm.…”

Section: Netting Modelmentioning

confidence: 99%

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Tu,

Zhang,

Liu

et al. 2023

JMSE

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The integrated development of offshore wind power and marine aquaculture is becoming increasingly important. However, the impact mechanism of integrating a net cage on the dynamic characteristics of offshore wind turbines remains unclear. This paper presents a design scheme for a multi-pile-supported offshore wind turbine integrated with an aquaculture net cage and conducts a preliminary theoretical analysis of the influence of an additional net cage on the wind turbine. The analysis reveals that the primary effect is an increase in hydrodynamic loads on the wind turbine foundation, while the structural frequency of the wind turbine remains largely unaffected. Furthermore, computational fluid dynamics (CFD) numerical models, whose accuracy is verified by physical experiments, are utilized to compare the hydrodynamic characteristics of the offshore wind turbine foundation with and without the net cage, considering different net solidities. The simulations identify significant changes in the flow field surrounding the foundation due to the presence of the net cage, resulting in a considerable increase in the overall hydrodynamic load on the foundation. Moreover, the mutual interference between the netting and the foundation amplifies their respective hydrodynamic loads and concentrates these loads at the upstream section of the structure. The maximum increase in hydrodynamic load for a single pile reaches 6.32 times its original value, posing significant risks to the structure. Finally, a preliminary feasibility analysis of the scheme was conducted. The results presented in this article can serve as a theoretical basis for the design of such innovative structures.

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Section: Netting Modelmentioning

confidence: 99%

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Tu,

Zhang,

Liu

et al. 2023

JMSE

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show abstract

“…Thus, it is only applicable to a single or to a certain interval distance of the floating spheres or floating tubes. To overcome this, an improved Morison hydrodynamics model for knotless nets based on CFD and metamodeling methods was developed (Huang et al, 2022). The SPH method was used by Gunn et al (2018); Altomare et al (2020); Ropero-Giralda et al ( 2020) and Domínguez et al (2019) to investigate the flow interactions between waves and floating spheres or floating blocks of a single mooring system through numerical simulations, and validated it with the physical experimental data.…”

Section: Component Of the Floating Reefmentioning

confidence: 99%

Review of Structure Types and New Development Prospects of Artificial Reefs in China

et al. 2022

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Artificial reefs are beneficial to restore fishery resources and increase fishery production. Meanwhile, they play a significant role in improving ocean ecology and accelerating the evolution of fishery industries. Since they are generally affected by currents, waves, and other hydrological factors, the flow field around artificial reefs and their stabilities have become a research hotspot in recent years. Research on artificial reefs is a systematic process consisting of four aspects: Firstly, the significance, the definition, the mechanism, and the present research progress were introduced for artificial reefs in detail. Secondly, the development trend of the sit-bottom artificial reef and that of the floating artificial reef were summarized, respectively. Thirdly, it was found that the combination of traditional artificial reefs and emerging ocean engineering has a great development potential in practical engineering. Finally, the existing problems related to the hydrodynamic characteristics of the artificial reefs in China were summarized, and the prospects of artificial reefs were proposed. The purpose of this study is to provide a scientific reference for the ecological and sustainable development of the large-scale construction of artificial reefs in the ocean.

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“…Wang et al [5] performed a hydrodynamic analysis of the ensemble of net and frame with different densities under different flow velocity and stroke angle conditions. Wang et al [6][7] performed simulations of knotless mesh panels to reveal the hydrodynamic properties around the net and improved the Morison model. Yang et al [8] studied flow field characteristics of the pile network structure under different flow velocities and angles of attack by using a unidirectional fluid-solid coupling model.…”

Section: Introductionmentioning

confidence: 99%

Study on the characteristics of the bypass flow field of the net structure under different Reynolds number conditions

Yang,

Li,

Zhao

2024

J. Phys.: Conf. Ser.

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A double-row crossed cylindrical structure is used as a basic net unit, and the simulation method is used to simulate the winding process of the double-rowed crossed cylinders at different Reynolds numbers, to study and analyze the change of the surrounding flow field with Reynolds number when the uniform flow passes through the net structure, and to compare with the single cylinder. It is found that the fluid passing through the intersection of the cylinders will form a return flow at the back side, and the fluid will extend to the cylinder after the return flow to the near wall of the structure to develop into a spreading flow. The spreading flow makes the distance from the vortex shedding position to the structure surface of the double-row crossed cylinder significantly larger than that of the single cylinder.

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An improved Morison hydrodynamics model for knotless nets based on CFD and metamodelling methods

Cited by 16 publications

References 52 publications

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Review of Structure Types and New Development Prospects of Artificial Reefs in China

Study on the characteristics of the bypass flow field of the net structure under different Reynolds number conditions

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