Numerical investigations of a pivoted point absorber wave energy converter integrated with breakwater using CFD

Yang, In-Jun; Tezdogan, Tahsin; Incecik, Atilla

doi:10.1016/j.oceaneng.2023.114025

Cited by 17 publications

(5 citation statements)

References 35 publications

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“…Compared with the previous model, the model established in this article has several improvements 22,23 . Most of the previous models mainly considered the heave motion of the float, this model integrates both the heave and pitch motions of the float and the vibrator 24–27 . This allows for a more accurate representation of the motion dynamics in real‐world wave conditions.…”

Section: Resultsmentioning

confidence: 99%

“…22,23 Most of the previous models mainly considered the heave motion of the float, this model integrates both the heave and pitch motions of the float and the vibrator. [24][25][26][27] This allows for a more accurate representation of the motion dynamics in real-world wave conditions. In addition, the model includes linear radiation damping and nonlinear viscous damping forces, which are often neglected in other models.…”

Section: Model Promotion Evaluationmentioning

confidence: 99%

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Oscillating body wave energy conversion efficiency based on Simulink simulation training

Yin,

Lu,

et al. 2024

Energy Science & Engineering

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With the development of the economy and society, we are faced with the dual challenges of energy demands and environmental pollution. As one of the important marine renewable energies, wave energy is widely distributed and abundant, and has considerable applications in various fields. Oscillating body wave energy converter (WEC) is most popular among WECs; its energy conversion efficiency is thus one of the key issues for practical large‐scale applications. This article establishes a new model of the float and vibrator under different motion conditions, conducts simulation training, and then solves the displacement and velocity at different times, and finally optimizes the maximum output power and optimal damping coefficient. Simulink calculation is one of the most effective tools including neural networks, which allows us to achieve intelligent training and simulation. The obtained data imply that the maximum output power could be 8.102 W when the corresponding linear damping is 21,000 N s/m and the rotation damping is 95,000 N s/m. The article takes into account the pitching motion of the float, providing a more realistic model and obtaining optimal power absorbing efficiency. The obtained results could be the potential reference data in practically setting up the wave energy conversion systems.

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Section: Resultsmentioning

confidence: 99%

Section: Model Promotion Evaluationmentioning

confidence: 99%

Oscillating body wave energy conversion efficiency based on Simulink simulation training

Yin,

Lu,

et al. 2024

Energy Science & Engineering

View full text Add to dashboard Cite

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“…The chamber has two openings at the top and bottom of different sizes, so that the rise and fall of the ocean waves change the gas in chamber to drive the turbine's rotation. Compared with other WECs, the OWC has a significant advantage of simplicity in that the only moving part of its energy conversion mechanism is the rotor of the turbine above the water level, which rotates at a relatively high speed and directly drives conventional generators [8,9]. In the early stage, OWCs were mainly the shore or nearshore type.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with other WECs, the OWC has a significant advantage of simplicity in that the only moving part of its energy conversion mechanism is the rotor of the turbine above the water level, which rotates at a relatively high speed and directly drives conventional generators [8,9]. In the early stage, OWCs were mainly the shore or nearshore type.…”

Section: Introductionmentioning

confidence: 99%

Study of a Center Pipe Oscillating Column Wave Energy Converter Combined with a Triboelectric Nanogenerator Device

Huang,

Yang,

Fan

et al. 2024

JMSE

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Wave energy is one of the most widely distributed and abundant energies in the ocean, and its conversion technology has been broadly researched. In this paper, a structure that combines a traditional center pipe oscillating water column and a triboelectric nanogenerator is proposed. Firstly, the structural characteristics and geometric parameters of the device are designed. The working process of the device is introduced, the motion equation of the device is established, and the power generation principle of the triboelectric nanogenerator is deduced and analyzed theoretically. Secondly, hydrodynamic modeling and simulation are carried out, the influence of the bottom shape of the main floating body and the structural parameters of the sag plate on the hydrodynamic force of the device is analyzed, and an electric field simulation of the generation process of the friction nanogenerator is carried out. Finally, experiments involving the wave water tank of the proposed device are conducted, including charging the capacitor of the device under different wave conditions and directly lighting the LED lamp. The performance of the proposed device under different wave conditions is discussed. According to the test results, the feasibility of the proposed device for wave energy conversion is confirmed.

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“…Tran et al [5] discovered that geometric nonlinearities lead to sub-harmonic excitations that severely compromise device performance. Yang et al [6] observed a significant contribution from the harmonic component of wave elevation and noted that this component increases performance under stationary waves around WECs. Zhang et al [7] discovered that the harmonic component significantly influences the instantaneous power absorption of a point absorber, with higher-order harmonics being more pronounced when motion responses are predominantly influenced by pitch resonance.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD Assessment of Harmonic Characteristics of Point-Absorber Wave-Energy Converters with Nonlinear Power Take-Off System

Yi,

Sun,

Liu

et al. 2023

JMSE

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The wave-energy excitation of point absorbers is highly associated with their resonant movement, and harmonic characteristics are of increasing concern in affecting resonance. However, the commonly used linearized power take-off (PTO) systems underestimate the impact of harmonics. The purpose of this study is to address the knowledge gap in assessing the contribution of hydraulic PTO systems to higher harmonic wave loads and velocities. In the present work, higher harmonics in point-absorber wave-energy converters (PA-WECs) with hydraulic power take-off (PTO) systems are investigated through both experimental and computational fluid dynamics (CFD) methods. The fast Fourier transform is used to decompose the high-order harmonics. To account for the influence of nonlinear wave–wave interaction on harmonics, the isolated PA-WEC is used as a basis for comparison with the paired PA-WECs. The influence of wave steepness is also estimated at two resonance periods. Results indicate that the additional resonance of the paired PA-WECs may be attributed to the harmonic wave loads at longer wave periods. Harmonic wave loads of paired PA-WECs typically have a more substantial impact and increase more rapidly with increasing wave steepness compared to isolated PA-WECs. Furthermore, as the wave steepness increases, there are significant enhancements in both the harmonic wave loads and heaving velocity, which strongly correlate with the instantaneous maximum hydraulic power. Consequently, our study will contribute to enhancing the maximum power output in the design of future point absorber arrays.

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Numerical investigations of a pivoted point absorber wave energy converter integrated with breakwater using CFD

Cited by 17 publications

References 35 publications

Oscillating body wave energy conversion efficiency based on Simulink simulation training

Oscillating body wave energy conversion efficiency based on Simulink simulation training

Study of a Center Pipe Oscillating Column Wave Energy Converter Combined with a Triboelectric Nanogenerator Device

Experimental and CFD Assessment of Harmonic Characteristics of Point-Absorber Wave-Energy Converters with Nonlinear Power Take-Off System

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