Numerical investigation on the hydrodynamics of a hybrid OWC wave energy converter combining a floating buoy

Wan, Chang; Chao, Yang; Bai, Xiaodong; Bi, Chen; Chen, Hailong; Li, Mingwei; Jin, Yeqing; Zhao, Lujun

doi:10.1016/j.oceaneng.2023.114818

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…The results of the above-mentioned study demonstrated that the hydrodynamic efficiency of an OWC calculated by using irregular waves (which represent marine wave motion more realistically) is significantly lower than that calculated by using regular waves. As demonstrated in the present work, the evaluation of the OWC efficiency obtained in [13] (although more realistic than that obtained by using regular waves) may still be overestimated because it was calculated by a pneumatic model that is usually adopted in the literature [7][8][9]13], in which the simplifying hypothesis of air incompressibility was assumed. This hypothesis is fully justified only in the case of low air speeds, i.e., a low rate of change in the air volume in the OWC chamber.…”

Section: Introductionmentioning

confidence: 82%

“…The simulation of these mutual interactions is necessary to evaluate the capacity of a given OWC to extract energy from waves for the different characteristics of the OWC chamber and wave fields. The above-mentioned simulations can be carried out by laboratory experiments [3][4][5] and numerical models [6][7][8][9]. Laboratory tests have the advantage of being able to actually reproduce, albeit on a smaller scale, the physical behavior of a given OWC prototype subjected to a certain wave field.…”

Section: Introductionmentioning

confidence: 99%

“…The above-mentioned simulations were carried out both by the proposed numerical model and by a simplified version that is based on the assumption, usually adopted in the literature [8][9][10], of the incompressibility of air. The comparison between the two sets of numerical results allows us to highlight the limits of the applicability of the simplified pneumatic model, which become evident when moving from the laboratory scale to the real scale and are more significant in the case of breaking waves.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Performance of an OWC under Breaking and Non-Breaking Waves

Cannata,

Biondi,

Simone

2024

JMSE

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A numerical model for the simulation of the performance of an oscillating water column (OWC) subjected to non-breaking and breaking waves is proposed in this paper. The numerical model consists of a hydrodynamic model specifically designed to simulate breaking waves and a pneumatic model that takes into account the air compressibility. The proposed numerical model was applied to evaluate the potential mean annual energy production from the waves of two coastal sites characterized by different hydrodynamic conditions: a deep-water condition, where the OWC interacts with non-breaking waves, and a shallow-water condition, where the OWC is subjected to breaking waves. The numerical results show that the effects of the air compressibility can be considered negligible only in numerical simulations of the performances of reduced-scale OWC devices, such as those used in laboratory experiments. We demonstrated that in real-scale simulations, the effect of the air compressibility within the OWC chamber significantly reduces its ability to extract energy from waves. The numerical results show that the effect of the air compressibility is even more significant in the case of a real-scale OWC located in the surf zone, where it interacts with breaking waves.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Performance of an OWC under Breaking and Non-Breaking Waves

Cannata,

Biondi,

Simone

2024

JMSE

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“…From the comparison between the results of a single-and a dual-chamber OWC, it was found that the effective frequency bandwidth of the dual-chamber device was broader than that of the single-chamber OWC. A hybrid oscillating water column-oscillating buoy wave energy converter was examined in [47][48][49]. The WEC consisted of an OWC and an oscillating buoy, which was attached to the outer wall of the converter.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Hydrodynamics on the Power Efficiency of a Toroidal Oscillating Water Column Device

Konispoliatis

2023

Sustainability

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This study tries to identify the effect of hydrodynamics on the absorbed wave power using a toroidal Oscillating Water Column (OWC) device. To this end, the fundamental hydrodynamic boundary value problem for an arbitrary shaped toroidal OWC device of revolution with vertical axis is solved. The described method is based on the discretization of the flow field around the device by means of ring-shaped macro-elements, in each of which axisymmetric eigenfunction expansions for the velocity potential is made. The solution sought for the corresponding diffraction and radiation velocity potentials is achieved using Galerkin’s method. The applied formulation is generic and can be employed for arbitrary configurations of toroidal OWCs. Therefore, the numerical results shown and discussed in the present paper, in terms of the hydrodynamic loads and the air volume flows inside the OWC chamber, concern different types of OWCs. From the present analysis, it is demonstrated that the absorbed wave power by the examined toroidal devices is strongly affected by the geometrical parameters of the device; thus, these should be properly considered towards the maximization of the device’s wave power efficiency.

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Hydrodynamic Performance of Two Types of Floating Breakwaters Integrated With a Wave Energy Converter

Ji,

Chen,

et al. 2024

J. Marine. Sci. Appl.

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Numerical investigation on the hydrodynamics of a hybrid OWC wave energy converter combining a floating buoy

Cited by 9 publications

References 34 publications

Numerical Study on the Performance of an OWC under Breaking and Non-Breaking Waves

Numerical Study on the Performance of an OWC under Breaking and Non-Breaking Waves

The Effect of Hydrodynamics on the Power Efficiency of a Toroidal Oscillating Water Column Device

Hydrodynamic Performance of Two Types of Floating Breakwaters Integrated With a Wave Energy Converter

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