Near trapped wave phenomena in an array of truncated cylinders in a perpendicular arrangement in front of a vertical breakwater

Konispoliatis, Dimitrios N.; Chatjigeorgiou, Ioannis K.; Mavrakos, Spyros A.

doi:10.1016/j.apm.2020.03.005

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…Additionally, a linear breakwater with parabolic openings, as a parabolic reflector, has been studied to converge propagating waves toward a focus point, in which the wave height is further amplified compared to the wave height in front of a vane-type vertical wall [20]. Furthermore, the efficiency of an array of heaving WECs located in front of a linear breakwater has been studied recently in [21][22][23]. In these investigations, the method of images [24,25] was utilized to simulate the presence of the vertical wall, thus a fully reflecting, bottom seated, surface piercing breakwater of infinite length was considered.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Efficiency of a Wave Energy Converter in Front of an Orthogonal Breakwater

Konispoliatis

Mavrakos

2021

JMSE

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In the present study, the hydrodynamic efficiency of a cylindrical wave energy converter (WEC) of vertical symmetry axis and arranged in front of a reflecting orthogonal breakwater is explored. The idea is based on exploiting the anticipated amplification of the scattered and the reflected wave fields originating from the presence of the vertical walls, towards increasing the WEC’s wave power absorption due to the walls’ wave reflections. Two types of converters are examined, namely the heaving device and the oscillating water column (OWC) device, assuming linear potential theory. The associated diffraction-, motion-, and pressure-radiation problems are solved using axisymmetric eigenfunction expansions for the velocity potential around the WECs by properly accounting for the wave field’s modification due to the walls’ presence. To this end, a theoretical formulation dealing with the evaluation of the converter’s performance is presented accounting for the coupling between the WEC and the reflecting vertical walls. The results depict that the amount of the harvested wave power by the WEC in front of an orthogonal wall is amplified compared to the absorbed wave power by the same WEC in the open sea.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic Efficiency of a Wave Energy Converter in Front of an Orthogonal Breakwater

Konispoliatis

Mavrakos

2021

JMSE

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“…However, in the WEC array case that is arranged perpendicular to the wall, for θ = 0 • , the inter-body spacing is expected to have a significant impact on the array's efficiency. This can be traced back to the appearance of near trapped waves between the converters as presented in [41].…”

Section: Numerical Resultsmentioning

confidence: 99%

Wave Power Absorption by Arrays of Wave Energy Converters in Front of a Vertical Breakwater: A Theoretical Study

Konispoliatis

Mavrakos

2020

Energies

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The present paper deals with the theoretical evaluation of the efficiency of an array of cylindrical Wave Energy Converters (WECs) having a vertical symmetry axis and placed in front of a reflecting vertical breakwater. Linear potential theory is assumed, and the associated diffraction and motion radiation problems are solved in the frequency domain. Axisymmetric eigenfunction expansions of the velocity potential are introduced into properly defined ring-shaped fluid regions surrounding each body of the array. The potential solutions are matched at the boundaries of adjacent fluid regions by enforcing continuity of the hydrodynamic pressures and redial velocities. A theoretical model for the evaluation of the WECs’ performance is developed. The model properly accounts for the effect of the breakwater on each body’s hydrodynamic characteristics and the coupling between the bodies’ motions and the power take-off mechanism. Numerical results are presented and discussed in terms of the expected power absorption. The results show how the efficiency of the array is affected by (a) the distance between the devices and the wall, (b) the shape of the WEC array configuration, as well as (c) the angle of the incoming incident wave.

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“…Potential flow theory [21][22][23][24] is a classic numerical method for solving the interaction between waves and cylindrical structures. However, the potential flow theory ignores the viscous effect of incompressible fluid, which may influence the accuracy of the numerical calculation results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Nonlinear Effects on the Performance of the Self-Protected Energy Concentrator

Zhang,

Cui,

2023

JMSE

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Wave concentrators have important application value in ocean engineering. Moreover, the performance of a concentrator on structural protection is important in the context of the complex ocean environment. A series of numerical simulations of the self-protected energy concentrator (SPEC) is performed under nonlinear wave conditions. The SPEC includes eight truncated cylinders arranged in a concentric circle. The performance of SPEC and the distribution of fluid field are studied by establishing a computational fluid dynamics (CFDs) model. It can be concluded that increasing wave steepness can weaken the self-protection performance and concentration effects due to its strong nonlinearity. The wave directions have little effect on the performance of SPEC. In addition, the change based on the target wave number can result in poor performance of SPEC.

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Near trapped wave phenomena in an array of truncated cylinders in a perpendicular arrangement in front of a vertical breakwater

Cited by 8 publications

References 42 publications

Hydrodynamic Efficiency of a Wave Energy Converter in Front of an Orthogonal Breakwater

Hydrodynamic Efficiency of a Wave Energy Converter in Front of an Orthogonal Breakwater

Wave Power Absorption by Arrays of Wave Energy Converters in Front of a Vertical Breakwater: A Theoretical Study

Numerical Study of Nonlinear Effects on the Performance of the Self-Protected Energy Concentrator

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