Wave energy absorption of a wave farm with an array of buoys and flexible runway

Zhang, H.C.; Xu, Dianna; Liu, C.R.; Wu, Yusen

doi:10.1016/j.energy.2016.04.107

Cited by 28 publications

(5 citation statements)

References 21 publications

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“…For the convenience of analysis, we choose ρ, B, T as the characteristic variables to nondimensionalize the floating system parameters. The non-dimensional parameters for the model are defined as [23]:…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…With this motivation, a multi-usage platform supported by an array of floating buoys can form a multi-purpose wave farm where PTOs embedded between the columns and the upper platform act as devices for energy extraction. In addition, the large floating platform can be utilized in various fields such as offshore airports [22], marine cities, energy farms [23], fuel storage facilities [24], etc. to better utilize the ocean space and resources [25].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Floating Platform with Embedded Wave Energy Harvesting Arrays in Regular and Irregular Seas

Zhang

Liu

et al. 2017

Energies

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This paper presents a study on a cost-effective engineering model that integrates an array of floating wave energy converters with a vast platform, a viable option for multi-functional performance in renewable energy capture and ocean space utilization. The wave energy converters are floating buoyance columns flexibly connected with the elastic platform. Hydrodynamic interactions among the columns are analyzed using an exact matrix transform method based on linear wave theory in the frequency domain. A parametric governing equation of compounded wave energy converter referred to as a wave farm is formulated by using Hamilton's principle which can be discretized using the Galerkin method. The effects of wave conditions and the parameters of hydraulic power take-off (PTO) on the wave energy absorption and dynamic characteristics of the energy harvesting system are investigated. Furthermore, the wave energy capture on irregular waves is also discussed. This research work aims at providing a theoretical guidance for wave energy harvesting system design.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Floating Platform with Embedded Wave Energy Harvesting Arrays in Regular and Irregular Seas

Zhang

Liu

et al. 2017

Energies

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“…Owing to the growth in population and the expansion of urban cities in coastal areas, it needs land reclamation from the sea for human activities and freeing valuable land sites for commercial and housing projects. With these points in mind, very large floating structures (VLFSs) have been proposed to acquire ocean space, which can be used in different practical applications such as floating bridges, emergency bases, airports, cities, energy farms, fuel storage facilities [1][2][3][4][5][6], etc. e design of a VLFS with efficient safety and performance is the key issue for successful implementations, operations, and further development [7].…”

Section: Introductionmentioning

confidence: 99%

Response Suppression of Multiple Hinged Floating Structures by Using Rubber Cushion

Shi

Chen

et al. 2021

Shock and Vibration

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A brand-new rubber cushion is proposed in this paper, which is installed between hinged floating modules in order to reduce the relative motion of the pitch; meanwhile, the cushion can be used as a fender for anti-impact in the docking process. Using the linear wave potential method, the structural dynamic model is formulated where the equivalent stiffness matrix for the rubber cushion is obtained by an integrating method employing linear assumption in addition to considering the heterogeneity of rubber. A numerical analysis is presented for a two-module semisubmersible floating structure. The hydrodynamic responses and connector loads of the floating structures with a rubber cushion are analyzed by using the frequency domain approach in both regular and irregular waves. The topological design and stiffness parameter selection of the rubber cushion is studied. This work may provide a new idea for suppressing the pitch motion of multiple hinged floating structures.

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“…Analytical studies on the hydrodynamic performance of the integrated WEC-breakwater were conducted and it was found that the peak efficiency can be achieved at 80% with a proper power take-off (PTO) [29,30]. Numerical and experimental studies expanded the parametric ranges of the buoys with different shapes [31][32][33]. It has also been pointed out that the rectangular box shape has a better energy converting capability combined with the necessary function to protect the harbor basin.…”

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confidence: 99%

Hydrodynamic Performance of Rectangular Heaving Buoys for an Integrated Floating Breakwater

Zhang

Qing-jun

Liu

2019

JMSE

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Recently, the integrated development of wave energy converters and breakwaters has become popular, moving from traditional passive wave absorption to active energy capture. In this study, rectangular heaving buoys are considered as floating breakwater modules to absorb wave energy. A numerical wave tank is established based on Reynolds Averaged Navier-Stokes equation and User-Define-Function in ANSYS-Fluent commercial software. The numerical results show that incident wave conditions and submerged depth have significant effects on the heaving performance and wave energy absorption of a rectangular buoy. Flow structures around the buoy are shown to exhibit flow separations and vortex shedding, which can provide more information on buoy optimization. Power take-off (PTO) reaction forces are assumed to be a linear function of the translation velocities of the buoy. Numerical results demonstrate that a suitable PTO module can improve the wave power absorption by up to 34.2% for certain buoy and wave conditions, which is valuable for further investigations. reliable data and valuable information for the designer. A buoy with heaving and pitching motion was tested and the dynamic properties were used for numerical model validation [7,8]. Experimental measurements of the interactions of a taut moored floating body were conducted under extreme wave conditions, with the aim of representing the wave energy converter in survivability mode [9].Falnes analyzed the heaving motion of WECs using potential flow theory with boundary element methods [10]. Heikkinen considered the effects of phase shift, cylinder radius, wave height, and period on the efficiency of a submerged pitch-type cylinder wave energy converter [11]. Several studies gave further insight into the influences of damping or PTO components on the hydrodynamic characteristics of point absorber wave energy converters, and proposed several effective control strategies [12][13][14][15][16][17]. Evans et al. and Davis et al. considered the limits of theory assumptions; for example, assuming the flow to be linear and irrotational and neglecting viscosity effects might be a reason for considerable discrepancies with a practical system [18,19].With the rapid development of the computer and computational fluid dynamics (CFD) techniques, to date, several software applications have been developed based on linear wave theory and radiation or diffraction models, such as ANSYS-Aqwa [20], WAMIT [21], and Hydrostar [22]. However, computational fluid dynamic (CFD) methods based on the Navier-Stokes (NS) equation model were found to be a promising approach for non-linear hydrodynamic characteristics between waves and floating bodies, viscous flow separations, and even possible wave overtopping and breaking [23]. The NS equation model often recruits the moving boundaries between solids and fluids and deforming meshes. It should be mentioned that the CFD techniques are growing popular as research tools for maritime structures, and a good deal of literature exists with respect to wave...

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Wave energy absorption of a wave farm with an array of buoys and flexible runway

Cited by 28 publications

References 21 publications

A Floating Platform with Embedded Wave Energy Harvesting Arrays in Regular and Irregular Seas

A Floating Platform with Embedded Wave Energy Harvesting Arrays in Regular and Irregular Seas

Response Suppression of Multiple Hinged Floating Structures by Using Rubber Cushion

Hydrodynamic Performance of Rectangular Heaving Buoys for an Integrated Floating Breakwater

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