Numerical analysis of the elastic response of a floating collar in waves

Zhao, Yunpeng; Bai, Xiaodong; Dong, Guohai; Bi, Chen; Gui, Fu-Kun

doi:10.1016/j.oceaneng.2014.12.015

Cited by 26 publications

(11 citation statements)

References 21 publications

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“…According to the calculation formula of Blaine angle [10,11], it can be known that the angle of rotation of the frame floating body within ∆t in the three-dimensional situation is equal to the Blaine angle at that moment. The specific rotation and dynamic synthesis of the floating frame, namely the transformation formula of the moving coordinate system and the overall coordinate system, is as follows:…”

Section: Movement Of Floating Framementioning

confidence: 99%

“…The reason why the main body of the reef is very similar to the structure of aquaculture cage includes two aspects: (1) the buoyancy system of floating reef includes float tube and float ball, which based on permutation and combination; (2) the reef's body is woven by mooring rope and fishing net. (Hou et al [7]; Huang et al [8]; Bai et al [9]; Zhao et al [10]; Gui et al [11]; Moe-Føre et al [12]; Strand et al [13]) have long been committed to the research of the structure type of net cage, the movement of net cage's floating frame, the mode of mooring, and the change of net cage's volume. They solved the problem of the size reduction and structural safety of the flexible structure of net cage under the action of waves and tidal currents, and ensured that net cage could meet the design requirements in different marine environments.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Pan

Tong

Zhou

et al. 2021

Water

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An artificial floating reef is an important part of the coastal ecological corridor. The large-scale construction of floating reefs by optimizing mooring methods can effectively improve the ecological effects of coastal projects. The artificial floating reef belongs to coastal engineering, and wave resistance is fundamental to its structural design. In this paper, the method for processing coupling forces and motion, the method for judging the floating reef out of water surface, and the method for correcting velocity and acceleration of water mass points are elaborated in detail by using the finite element method and lumped-mass mooring model. By comparing and analyzing the results of physical experiment and numerical simulation, the correctness of the numerical model is verified. Finally, the diachronic variation of pitching angle of floating reef, the tension of the mooring rope, and the total tension of the fixed points of the fishing net were analyzed by the dynamic response numerical mode with a new type of mooring. The purpose of the current study was to provide a basis for the optimization of structure shape, the matching of floating body, and the counterweight of artificial floating reef.

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Section: Movement Of Floating Framementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Pan

Tong

Zhou

et al. 2021

Water

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“…In the deep sea, there are general phenomena of strong winds, high waves, and rapid flow, which can easily damage breeding facilities and marine organisms. Especially for the widely used gravity cage, the deformation and stress concentration on the frame and netting caused by rapid flow rates greatly impact the effective cultivation volume and service life of the cage [7,8]. Hence, the placement of an SHT on the periphery of an aquaculture farm can both harvest energy for power facilities and reduce the flow velocity to protect the cages.…”

Section: Introductionmentioning

confidence: 99%

Parameter Analysis of Savonius Hydraulic Turbine Considering the Effect of Reducing Flow Velocity

Yao

Chen

et al. 2019

Energies

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The Savonius-type hydraulic turbine, mainly known for its good self-starting properties and simple structure, not only has energy capturing characteristics but also has a certain effect on flow velocity reduction. Aside from ensuring energy capture efficiency, studying the effects of parameters on the flow velocity reduction capacity is of great significance for the protection of mariculture, as it can reduce the damage to cages and fishes. In this study, a computational fluid dynamics method was carried out to investigate the hydrodynamic characteristics and variations in the wake of a turbine. The accuracy of the simulation results was verified by experimental comparison. Firstly, the velocity contours and vectors were studied in detail to reveal the mechanism of the flow velocity reduction effect. Secondly, the velocity attenuation coefficient and relative attenuation length were formulated by the variation rule of the velocity field to evaluate the turbine reduction strength and range. Finally, the power coefficient was considered to predict the performance of a turbine under different tip speed ratios, overlap ratios, blade curvatures, and blade numbers. The results showed that the turbine had an obvious flow velocity reduction effect in the rear “sword”-shaped area, where the velocity field distribution had a certain regularity. In addition, by comprehensively comparing the simulation data, it was found that the respective effect trend of tip speed ratio, blade number, overlap ratio, and curvature on the turbine’s energy capture and flow velocity reduction characteristics was basically the same. Considering the effect of reducing flow velocity, a two-bladed turbine with a blade curvature of 0.8 and an overlap ratio of 0.15 is the optimal configuration.

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“…Despite the fact that aquaculture operators have one of the most dangerous professions in Norway, only limited research efforts have been made towards improving occupational safety in this industry, and statistics and in-depth analysis of occupational fatalities are missing. Structural properties of marine fish farms, both nets and cages, have been more thoroughly investigated than occupational safety [12][13][14][15]. Structural analysis has been especially important in relation to preventing the escape of fish from net cages [16], which has received a wide focus because of the negative implications from interactions with wild salmon [17,18].…”

Section: Introductionmentioning

confidence: 99%

Occupational safety in aquaculture – Part 2: Fatalities in Norway 1982–2015

et al. 2018

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This article presents an overview of reported fatalities in the Norwegian aquaculture industry focusing on the production of Atlantic salmon and trout, which dominate the fish farming industry in Norway. The data on fatalities from 1982-2015 are registered by SINTEF Ocean, which is the only data source available. The fatality data set includes information on the incidents leading to fatalities, activities conducted at the time of fatalities, and the time of year the fatalities were registered. The article discusses the fatality trends in light of the characteristics and changes in the Norwegian fish farming industry during the last three decades. This provides useful information for determining the most important current safety challenges and for developing efficient safety management in aquaculture.

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Numerical analysis of the elastic response of a floating collar in waves

Cited by 26 publications

References 21 publications

Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Parameter Analysis of Savonius Hydraulic Turbine Considering the Effect of Reducing Flow Velocity

Occupational safety in aquaculture – Part 2: Fatalities in Norway 1982–2015

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