3D experimental study on a cylindrical floating breakwater system

Ji, Chunyan; Guo, Y.C.; Cui, Jie; Yuan, Zhiming; Ma, Xiaojian

doi:10.1016/j.oceaneng.2016.07.051

Cited by 53 publications

(15 citation statements)

References 26 publications

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“…As realistic floating breakwaters are 3D where the breakwater length is finite, several researchers have conducted experimental and numerical studies on 3D floating breakwaters [6][7][8][9][10][11][12]. In experimental studies, several researchers (e.g., [7,9]) used the transmission coefficient at a certain surface point for evaluating the wave attenuation performance of 3D floating breakwaters. In numerical studies, the mean transmission coefficient within a prescribed surface area has been adopted for the evaluation of the wave attenuation performance [10,13].…”

Section: Introductionmentioning

confidence: 99%

Representative Transmission Coefficient for Evaluating the Wave Attenuation Performance of 3D Floating Breakwaters in Regular and Irregular Waves

Nguyen

Park

Han

et al. 2021

JMSE

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Wave attenuation performance is the prime consideration when designing any floating breakwater. For a 2D hydrodynamic analysis of a floating breakwater, the wave attenuation performance is evaluated by the transmission coefficient, which is defined as the ratio between the transmitted wave height and the incident wave height. For a 3D breakwater, some researchers still adopted this evaluation approach with the transmitted wave height taken at a surface point, while others used the mean transmission coefficient within a surface area. This paper aims to first examine the rationality of these two evaluation approaches via verified numerical simulations of 3D heave-only floating breakwaters in regular and irregular waves. A new index—a representative transmission coefficient—is then presented for one to easily compare the wave attenuation performances of different 3D floating breakwater designs.

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Section: Introductionmentioning

confidence: 99%

Representative Transmission Coefficient for Evaluating the Wave Attenuation Performance of 3D Floating Breakwaters in Regular and Irregular Waves

Nguyen

Park

Han

et al. 2021

JMSE

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“…Single pontoon type of floating breakwater has been studied by many researchers [3][4][5][6], each of these investigations had devoted to the efficiency of the structure in respects to hydrodynamic coefficients, motion response and mooring force. Many recent researches have been for twin pontoons of floating breakwater (TPFB) such as cage floating breakwater [7,8] and cylindrical floating breakwater [9][10][11]. Instead of adding total weight, the inertia of TPFB can simply increases by adjusting its lateral separation, S/D (ratio of distance between two pontoons over its width).…”

Section: Introductionmentioning

confidence: 99%

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

Fitriadhy¹,

Abdullah²,

Hairil³

et al. 2019

JMES

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Since the attribute of wave energy transmission is susceptible to lateral separation (S/D) between twin pontoons of floating breakwater (TPFB), arbitrarily selection of S/D may present problems in the evaluations on the effectiveness of the structure. This paper presents a numerical optimization modelling aimed at obtaining the optimum S/D through Genetic Algorithm (GA) approach. The artificial intelligence is primarily employed to minimize transmission of wave energy coefficients ( ) whereas maximize energy dissipation coefficient ( ). To achieve such demand, a numerical simulation implementing a MATLAB code as an interface between the Genetic Algorithm and a CFD program is applied. Several parameters for the effects of various wavelengths and ratios of S/D including a set of criteria have been considered in the simulation, where the optimum solution is chosen from various populations. The results demonstrated that the current GA analysis is efficient that can search a global trade-off between and to determine an optimum S/D ratio. For S/D equal to 2.72, minimized to less than 0.3 as compared to existing model ( > 0.5) while maximized to greater than 0.95 resulting to optimum hydrodynamic effects of TPFB. Hence, the optimization algorithm can serve as a useful engineering tool for a conceptual design to determine an optimum S/D for twin pontoon floating breakwater.

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“…Loukogeorgaki and Angelides [14] built a three-dimensional model to investigate the dynamic response of a moored floating breakwater in frequency domain under the action of regular waves. Ji et al [15][16][17] carried out a series of experimental research on a dual cylindrical pontoon-net floating breakwater. Their numerical research is still conducted on a two-dimensional model which cannot capture the three-dimensional characteristics of waves in wave-structure interactions.…”

Section: Introductionmentioning

confidence: 99%

The Numerical Modeling of Coupled Motions of a Moored Floating Body in Waves

Cheng

Lin

2018

Water

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Nonlinear interactions between water waves and a moored floating body are investigated using the virtual boundary force (VBF) method. The paper first introduces an in-house three-dimensional viscous incompressible flow model (NEWTANK), which is used to simulate wave-floating structure interaction by using the VBF method. Then the coupling procedure between the mooring line model and the floater model is described. Some validation cases of the developed model, including the motions of a free-floating box in two different water waves, are presented. The present numerical results will be compared with the available experimental data and other numerical results from the published literature. After that, the validity of the mooring line in the numerical model is simulated by simulating the motions of a floating box in still water. Finally, the verified model is applied to analyze the wave-induced motions of a catenary moored floating structure, investigating the motion responses and mooring forces responses. The numerical results agree well with the experimental measurements on the whole. This indicates that the present numerical model can correctly capture the main features of the wave-moored floating structure interaction.

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3D experimental study on a cylindrical floating breakwater system

Cited by 53 publications

References 26 publications

Representative Transmission Coefficient for Evaluating the Wave Attenuation Performance of 3D Floating Breakwaters in Regular and Irregular Waves

Representative Transmission Coefficient for Evaluating the Wave Attenuation Performance of 3D Floating Breakwaters in Regular and Irregular Waves

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

The Numerical Modeling of Coupled Motions of a Moored Floating Body in Waves

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