Implementation and Validation of a Potential Model for a Moored Floating Cylinder under Waves

Gaeta, Maria Gabriella; Segurini, Giacomo; Moreno, Adrià M.; Archetti, Renata

doi:10.3390/jmse8020131

Cited by 13 publications

(7 citation statements)

References 32 publications

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“…Taking the position coordinate of mass block, (z x), as the optimization variable, the range of z is set as [17,37], and the range of x is set as [34,44]. The optimal mass block layouts in various mooring modes can be obtained by the multi-objective genetic algorithm, [38][39] non-dominated Sorting Genetic Algorithm II (NSGA-II), which is a widely used optimization algorithm and no detailed description is required in this paper.…”

Section: Optimization For Mass Block Layout In Various Mooring Modesmentioning

confidence: 99%

Effect of mooring mode and internal mass block layout on eccentric rotating wave energy converter model

Xue

Liu

Huang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Reliability and energy conversion ability are the most concerned performance indexes of Wave Energy Converter Eccentric Rotating Wave Energy Converter (ERWEC) with closed shell can protect energy conversion unit away from seawater, which has shown excellent reliability. However, energy conversion ability of Eccentric Rotating Wave Energy Converter is poor and the method to improve performance of ERWEC is still not clear. The objective of this work is to improve mooring security, motion attitude stability and energy conversion ability of ERWEC. In this paper, experimental model of ERWEC was developed, and energy conversion mechanism was clarified. Experiments on various mooring modes and various internal mass block layouts were carried out. Besides, breaking coefficient, instability coefficient and energy conversion coefficient were calculated to evaluate performance of ERWEC. The result showed that the effect of mooring mode on mooring security, motion attitude stability and energy conversion ability was coupled to the effect of internal mass block layout on those three indexes. Furthermore, under determined mooring mode condition, internal mass block layout was optimized by multi-objective genetic algorithm. This paper provides basis for conceptual design of mooring mode and real-time control of mass block layout to achieve better mooring security, motion attitude stability and energy conversion ability of ERWEC.

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Section: Optimization For Mass Block Layout In Various Mooring Modesmentioning

confidence: 99%

Effect of mooring mode and internal mass block layout on eccentric rotating wave energy converter model

Xue

Liu

Huang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Assuming inviscid and incompressible fluid with irrotational flow, the fluid motion is described by introducing the velocity potential. Its complex spatial part is defined as follows [33,34]: The hydrodynamic analysis of the WEC circular array around the monopile, including the hydrodynamic interactions among all co-located bodies, is conducted in the frequency domain and it relies on the BIE method (e.g., [30][31][32]), which is numerically realized using WAMIT [33]. The analysis is based on a three-dimensional linear diffraction theory, where the monopile is considered to be fixed at its position, while all WECs are taken to undergo small amplitude oscillations only along the vertical -axis, i.e., along their working direction (Figure 2b).…”

Section: Numerical Modelingmentioning

confidence: 99%

Frequency-Based Performance Analysis of an Array of Wave Energy Converters around a Hybrid Wind–Wave Monopile Support Structure

Gkaraklova

Chotzoglou

Loukogeorgaki

2020

JMSE

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In this paper, we investigate, in the frequency domain, the performance (hydrodynamic behavior and power absorption) of a circular array of four semi-immersed heaving Wave Energy Converters (WECs) around a hybrid wind–wave monopile (circular cylinder). The diffraction/radiation problem is solved by deploying the conventional boundary integral equation method. Oblate-spheroidal and hemispherical-shaped WECs are considered. For each geometry, we assess the effect of the array’s net radial distance from the monopile and of the incident wave direction on the array’s performance under regular waves. The results illustrate that by placing the oblate spheroidal WECs close to the monopile, the array’s power absorption ability is enhanced in the low frequency range, while the opposite occurs for higher wave frequencies. For hemispherical-shaped WECs, the array’s power absorption ability is improved when the devices are situated close to the monopile. The action of oblique waves, with respect to the WECs’ arrangement, increases the absorbed power in the case of oblate spheroidal WECs, while these WECs show the best power absorption ability among the two examined geometries. Finally, for the most efficient array configuration, consisting of oblate spheroidal WECs situated close to the monopile, we utilize an “active” Power Take-Off (PTO) mechanism, facilitating the consideration of a variable with frequency PTO damping coefficient. By deploying this mechanism, the power absorption ability of the array is significantly enhanced under both regular and irregular waves.

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“…In common with the assumptions that have been employed by Zhang, 2016, 2018), the semi-analytical model developed in this paper is based on linearised hydrodynamic theory for an ideal irrotational fluid, and the deformation and motion of the platform are neglected. These assumptions have been adopted for the design of various wave energy converters, e.g., point absorber (Bozzi et al, 2013(Bozzi et al, , 2017Gaeta et al, 2020), raft-type device (Zheng and Zhang, 2017) and OWC Mavrakos, 2016, 2019).…”

Section: Formulation Of the Wave Diffraction/radiation Problemmentioning

confidence: 99%

Hydrodynamic performance of a multi-Oscillating Water Column (OWC) platform

Zheng

Antonini

Zhang

et al. 2020

Applied Ocean Research

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A rectangular barge consisting of multiple oscillating water columns (OWCs) is considered in this paper, hereinafter referred to as a multi-OWC platform. Each OWC chamber is enclosed by two partially submerged vertical walls and the deck of the platform. An incident wave produces oscillation of the water column in each OWC chamber and hence air is pumped by the internal water surface to flow through a Wells turbine installed at the chamber top. The effect of the turbine is characterised as a linear power take-off (PTO) system. A semi-analytical model based on linear potential flow theory and the eigen-function expansion method is developed to solve the wave radiation and diffraction problems of the multi-OWC platform. The hydrodynamic coefficients evaluated with direct and indirect methods of the model are shown to be in excellent agreement, and the energy conservation relationship of the multi-OWC platform is satisfied. The validated model is then applied to predict wave motion, dynamic air pressure, wave power extraction, and wave reflection and transmission coefficients of the multi-OWC platform. The effects of the PTO strategies, the number of chambers, the overall platform dimensions and the relative dimensions of adjacent

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Implementation and Validation of a Potential Model for a Moored Floating Cylinder under Waves

Cited by 13 publications

References 32 publications

Effect of mooring mode and internal mass block layout on eccentric rotating wave energy converter model

Effect of mooring mode and internal mass block layout on eccentric rotating wave energy converter model

Frequency-Based Performance Analysis of an Array of Wave Energy Converters around a Hybrid Wind–Wave Monopile Support Structure

Hydrodynamic performance of a multi-Oscillating Water Column (OWC) platform

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