Hydrodynamic analysis of three–unit arrays of floating annular oscillating–water–column wave energy converters

Konispoliatis, Dimitrios N.; Mazarakos, Thomas P.; Mavrakos, Spyros A.

doi:10.1016/j.apor.2016.10.003

Cited by 28 publications

(5 citation statements)

References 29 publications

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“…The study demonstrated that all the incident wave power can be captured with optimum oscillation amplitudes. In [156,157], researchers examined various interacting free-floating OWC devices floating independently or as a unit. An analytical solution method for three boundary value problems, namely the diffraction, the motion-and the pressure-radiation problems, was given using the multiple scattering approach.…”

Section: Owc Arraymentioning

confidence: 99%

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Konispoliatis

2024

J Energ Power Technol

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The main challenge in designing offshore renewable energy structures is to ensure their structural integrity on a life cycle basis while operating in harsh environments and, in parallel, being financially competitive and environmentally friendly concerning other types of energy systems. The Oscillating Water Column (OWC) converters are among the first energy converters to be developed and deployed into the sea due to their relative simplicity of operation and relatively small number of moving parts. This review provides an overview of the recent floating OWC prototypes and projects and the latest research developments in wave energy conversion using the oscillating water column principle. Furthermore, critical structural advances are discussed, mainly focusing on the converter’s geometry and type and its mooring system design towards amplifying the absorbed wave power.

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Section: Owc Arraymentioning

confidence: 99%

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Konispoliatis

2024

J Energ Power Technol

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“…In this study, a statistical approach has been applied to compile the fatigue environmental conditions, referencing Konispoliatis et al (2022) [30]. This research collected data from the Hsinchu Buoy (120.84 • E, 24.76 • N), which was made available by the Central Weather Administration (CWA), Taiwan, covering the years from 2010 to 2021.…”

Section: Analysis Of Dynamic Cablesmentioning

confidence: 99%

Experimental and Numerical Study of Suspended Inter-Array Cable Configurations for Floating Offshore Wind Farm

Li,

Su,

Yang

2024

JMSE

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The present study evaluates the feasibility of using a fully suspended inter-array cable system for an offshore wind farm. It includes both numerical simulations and a scaled-down experiment, conducted at a 1:49 scale, to validate the numerical results. To achieve the goal, a 15 MW floating offshore wind turbine (FOWT) and a floating offshore substation (FOSS) are involved to simulate the wind farm array. This study incorporates the 50-year return period conditions of the Taiwan Hsinchu offshore area, which has a water depth of about 100 m, to validate the specifications related to the platform motion and mooring line tension. Additionally, an analysis of the tension, curvature, and fatigue damage of the dynamic cable system is discussed in this research. Because a fully suspended cable is a relatively new concept and may be more frequently considered in a deeper water depth area, numerical simulation software Orcina Orcaflex 11.4 has been chosen to conduct the fully coupled simulation, determining whether the fully suspended cable system could effectively withstand the challenges posed by extreme sea conditions. This is due to the reason that a fully suspended cable would occupy a larger space in the ocean, which may pose a risk by influencing the navigation of the vessels. Therefore, the cable laying depth under normal sea states is also discussed to evaluate the influence over vessel navigation. This study also collects the long-term environmental data from the Central Weather Bureau, Taiwan, to calculate the accumulative cable fatigue damage under different sea states. To integrate the results, this research applies fitness parameters to evaluate the feasibility of each cable configuration. Covering the cable performance under extreme sea states and regular operating sea states offers valuable insights for applications in ocean engineering.

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“…The internal floating hexagonal platform houses the control centre, power production and storage facility, fish processing plant, offices, workers' quarters, etc. Alternatively, the floating ring structure may be designed to trap waves to create a high wave energy environment with the view to harvest wave energy using the piston-like internal floating cylinder, i.e., Wave Energy Converter (WEC) device [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Mavrakos, et al [16] addressed tightly moored two concentric floating circular cylinders under first and second-order waves. Konispoliatis, Mazarakos and Mavrakos [10] presented analytical solutions for an array of Oscillating Water Column (OWC) devices. Each OWC device consists of concentric circular cylinders.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Behaviour of a Floating Polygonal Platform Centrally Placed within a Polygonal Ring Structure under Wave Action

Park

Wang

2022

JMSE

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In this paper, a semi-analytical method has been developed for the hydrodynamic analysis of a floating polygonal platform that is centrally placed within a floating polygonal ring structure under wave action. In view to understand the wave interactions inside the ring structure, the formulation considers two cases: when the platform and ring structure oscillate individually, and when they oscillate together under wave action. The polygonal shapes of the floating structures can be created from a parametric equation involving the cosine-type radial perturbation. The formulation and computer code are verified by comparing the results with those obtained from the commercial software ANSYS AQWA. When floating ring structures are used, trapped waves are created in the inner water basin resulting in resonance. The interactions among the trapped waves, inner floating platforms and outer ring structures are investigated by performing parametric studies. By changing the dimensions of the platform and ring structure such as the drafts, the radii of platforms and polygonal shapes, their effects on major hydrodynamic quantities may be understood.

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Hydrodynamic analysis of three–unit arrays of floating annular oscillating–water–column wave energy converters

Cited by 28 publications

References 29 publications

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Experimental and Numerical Study of Suspended Inter-Array Cable Configurations for Floating Offshore Wind Farm

Hydrodynamic Behaviour of a Floating Polygonal Platform Centrally Placed within a Polygonal Ring Structure under Wave Action

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