Numerical Modelling of a Heaving Point Absorber in Front of a Vertical Wall

Schay, Julius; Bhattacharjee, J.; Soares, C. Guedes

doi:10.1115/omae2013-11491

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…More specifically, in [11] the performance characteristics of an array of five wave energy heaving converters placed in front of a reflecting vertical breakwater have been numerically studied whereas, in [12] the performance of an array of heaving WECs, coupled with DC generators, in front of a breakwater, were numerically and experimentally investigated. Furthermore, solution methods concerning the wave diffraction and radiation problems for the case of a truncated cylinder, in front of a vertical wall have been presented in the literature [13][14][15][16], whereas, in [17] the efficiency of a heaving point absorber in front of a vertical wall in regular and irregular seas was studied, based on different floater geometries and wave heading angles. In [18] the possibility of using oscillating water column (OWC) converters for reducing the wave reflection from vertical breakwaters was explored.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Evaluation of the Hydrodynamic Characteristics of Arrays of Vertical Axisymmetric Floaters of Arbitrary Shape in front of a Vertical Breakwater

Konispoliatis

Mavrakos

Katsaounis

2020

JMSE

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The present paper deals with the analytical evaluation of the hydrodynamic characteristics of an array of vertical axisymmetric bodies of arbitrary shape, placed in front of a reflecting vertical breakwater, which can be conceived as floaters for wave power absorption. At the first part of the paper, the hydrodynamic interactions between the floaters and the adjacent breakwater are exactly taken into account using the method of images, whereas, the interaction phenomena between the floaters of the array are estimated using the multiple scattering approach. For the solution of the problem, the flow field around each floater of the array is subdivided into ring-shaped fluid regions, in each of which axisymmetric eigenfunction expansions for the velocity potential are made. In the second part of the paper, extensive theoretical results are presented concerning the exciting wave forces and the hydrodynamic coefficients for various arrays’ arrangements of axisymmetric floaters. The aim of the study is to show parametrically the effect that the vertical breakwater has on the hydrodynamic characteristics of each particular floater.

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Section: Introductionmentioning

confidence: 99%

Theoretical Evaluation of the Hydrodynamic Characteristics of Arrays of Vertical Axisymmetric Floaters of Arbitrary Shape in front of a Vertical Breakwater

Konispoliatis

Mavrakos

Katsaounis

2020

JMSE

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“…The diffraction and radiation problems for the case of a single, free-floating, truncated cylinder in front of a bottom-mounted wall has been examined in the frequency domain by [11] and [12], respectively, while the power absorption of a single heaving WEC in the presence of the wall boundary has been investigated and assessed, also in the frequency domain, by [13]. In the latter study, the analysis was implemented for two different WECs' shapes (cone and hemispherical cylinder), for various sizes and drafts of the WEC, as well as for different distances of the WEC from the wall, while the action of regular and irregular waves of various wave directions was taken into account.…”

Section: Introductionmentioning

confidence: 99%

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

Loukogeorgaki

Boufidi

Chatjigeorgiou

2020

Water

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In this paper, we investigate the performance of a linear array of five semi-immersed, oblate spheroidal heaving Wave Energy Converters (WECs) in front of a bottom-mounted, finite-length, vertical wall under perpendicular to the wall regular waves. The diffraction and radiation problems are solved in the frequency domain by utilizing the conventional boundary integral equation method. Initially, to demonstrate the enhanced absorption ability of this array, we compare results with the ones corresponding to arrays of cylindrical and hemisphere-shaped WECs. Next, we investigate the effect of the array’s distance from the wall and of the length of the wall on the physical quantities describing the array’s performance. The results illustrate that the array’s placement at successively larger distances from the wall, up to three times the WECs’ radius, induces hydrodynamic interactions that improve the array’s hydrodynamic behavior, and thus its power absorption ability. An increase in the length of the wall does not lead to any significant power absorption improvement. Compared to the isolated array, the presence of the wall affects positively the array’s power absorption ability at specific frequency ranges, depending mainly on the array’s distance from the wall. Finally, characteristic diffracted wave field patterns are presented to interpret physically the occurrence of the local minima of the heave exciting forces.

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“…A single truncated cylinder and an oscillating water column device (OWC), placed in front of a breakwater, have been studied in [13][14][15][16][17], respectively, concerning the solution of the corresponding wave diffraction and motion and pressure radiation problems. In [18] the efficiency of a single heaving WEC placed in front of a vertical wall has been examined under the action of regular and irregular waves for different WEC geometries and distances from the wall. In these works, a completely reflecting boundary of infinite extent is assumed by the use of the method of images.…”

Section: Introductionmentioning

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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Numerical Modelling of a Heaving Point Absorber in Front of a Vertical Wall

Cited by 8 publications

References 9 publications

Theoretical Evaluation of the Hydrodynamic Characteristics of Arrays of Vertical Axisymmetric Floaters of Arbitrary Shape in front of a Vertical Breakwater

Theoretical Evaluation of the Hydrodynamic Characteristics of Arrays of Vertical Axisymmetric Floaters of Arbitrary Shape in front of a Vertical Breakwater

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

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

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