Hydrodynamic Performance of a Pitching Float Wave Energy Converter

Ma, Yong; Ai, Shan; Yang, Lele; Zhang, Aiming; Liu, Sen; Zhou, Binghao

doi:10.3390/en13071801

Cited by 7 publications

(5 citation statements)

References 36 publications

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“…Our simulation results are in accordance with those of existing work [41][42][43]. Refs From the results in Figure 6, we can see that wave levels have a significant impact on the buoy PV modules.…”

Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 91%

Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 87%

“…Our simulation results are in accordance with those of existing work [41][42][43]. Refs [41,42] utilized ANSYS-AQWA for CFD simulations to obtain numerical results and verified the correctness of the model through physical experiments. In addition, Jeong et al [43] carried out a detailed hydrodynamic analysis of a lighted buoy working on the sea surface with a buoy structure similar to the one in this paper, and obtained the result that its rolling angle is ±20 • under a wave with a frequency of 1.397 rad/s and a wave height of 0.794 m. The studies of these scholars provide some evidence of the correctness of the model in this paper.…”

Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 87%

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Design and Optimization of PV Power Supply System for Marine Buoys

Wang,

Song,

et al. 2023

JMSE

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Marine buoys need to operate in high sea areas far from land for a long time. Therefore, how to provide a long-term power supply for the buoy system is critical to be addressed. Photovoltaic (PV) power supply systems are the most commonly used power supply method for marine buoys. Due to the limitations of the buoy structure and considering the rotation of the buoy in the ocean, most of the PV modules are placed in a four-sided enclosure. The output performance of the PV power supply system in this placement is affected by the tilt angle produced by waves. However, there are few relevant studies on the actual power generation performance of PV power supply systems for marine buoys, and there is a lack of methods for power generation performance analysis. In order to meet the power requirements of the marine buoy, a large design margin must be left. It increases the cost of marine buoys. In this paper, second-order Stokes waves are used to simulate waves of different levels by varying the wave height and frequency. The motion characteristics of the marine buoy are analyzed using ANSYS-AQWA under calm-rippled, smooth, slight, and moderate conditions. Combined with the tilted surface irradiance calculation model to get the variation law of solar radiation of PV modules under dynamic conditions, the effect of different tilt angle PV modules on the output of PV system under dynamic conditions was also studied. The experiments show that for every 5° increase in the tilt angle of the PV modules the output power of the system decreases by 3% on average. As the tilt angle of the PV modules increases, the impact on the system output performance is more pronounced. The output power decreased by 69.5% when the PV modules were tilted at an angle of 90°, and the PV system electrical parameters were similarly affected. By comparing the influence of different tilt angles on the power supply performance of PV modules, we optimize the design of the PV power supply system of the buoy. This enables the designers to maximize the use of limited area and space while reducing the cost and extending the power supply time and service life of the buoy.

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Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 91%

Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 87%

Section: Simulation Of Buoy Motion and Analysis Of Solar Irradiancesupporting

confidence: 87%

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Design and Optimization of PV Power Supply System for Marine Buoys

Wang,

Song,

et al. 2023

JMSE

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“…Numerical codes based on the potential flow theory are also frequently used to evaluate the performance of point-absorber-type WECs [9][10][11], and discrepancies in motions are often noted between the numerical and experimental results for motion. This issue is attributed to the absence of viscous effects in such numerical models [12,13], in which the assumption of zero viscosity in the fluid can lead to over-estimation of the motions for bodies when the pressure and skin friction drag from viscous effects is significant.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, the region surrounding the resonant frequency is most influenced by the viscous effects [14]. Accurate modelling of the motions about the natural periods is important, and several investigations have sought to mitigate the effects of viscous damping by tuning the numerical models [9,10,15,16]. A common approach taken in potential flow investigations is to incorporate an external, frequency-independent damping force that is linearly proportional to the structure's displacement or rotational velocity; some examples include the simulation of side-by-side vessel motions [15] and multiple point absorber WECs integrated into a floating platform [16].…”

Section: Introductionmentioning

confidence: 99%

Mooring Analysis of a Floating OWC Wave Energy Converter

Pols

Gubesch

Abdussamie

et al. 2021

JMSE

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This investigation focuses on the modelling of a floating oscillating water column (FOWC) wave energy converter with a numerical code (ANSYS AQWA) based on potential flow theory. Free-floating motions predicted by the numerical model were validated against experimental data extrapolated from a 1:36 scale model device in regular and irregular sea states. Upon validation, an assessment of the device’s motions when dynamically coupled with a four-line catenary mooring arrangement was conducted at different incident wave angles and sea states ranging from operational to survivable conditions, including the simulation of the failure of a single mooring line. The lack of viscosity in the numerical modelling led to overpredicted motions in the vicinity of the resonant frequencies; however, the addition of an external linear damping coefficient was shown to be an acceptable method of mitigating these discrepancies. The incident wave angle was found to have a limited influence on the magnitudes of heave, pitch, and surge motions. Furthermore, the obtained results indicated that the mooring restoring force is controlled by the forward mooring lines under the tested conditions.

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Fast nonlinear Froude–Krylov force calculation for prismatic floating platforms: a wave energy conversion application case

Giorgi

Sirigu

Bonfanti

et al. 2021

J. Ocean Eng. Mar. Energy

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Computationally fast and accurate mathematical models are essential for effective design, optimization, and control of wave energy converters. However, the energy-maximising control strategy, essential for reaching economic viability, inevitably leads to the violation of linearising assumptions, so the common linear models become unreliable and potentially unrealistic. Partially nonlinear models based on the computation of Froude–Krylov forces with respect to the instantaneous wetted surface are promising and popular alternatives, but they are still too slow when floaters of arbitrary complexity are considered; in fact, mesh-based spatial discretisation, required by such geometries, becomes the computational bottle-neck, leading to simulations 2 orders of magnitude slower than real-time, unaffordable for extensive iterative optimizations. This paper proposes an alternative analytical approach for the subset of prismatic floating platforms, common in the wave energy field, ensuring computations 2 orders of magnitude faster than real-time, hence 4 orders of magnitude faster than state-of-the-art mesh-based approaches. The nonlinear Froude–Krylov model is used to investigate the nonlinear hydrodynamics of the floater of a pitching wave energy converter, extracting energy either from pitch or from an inertially coupled internal degree of freedom, especially highlighting the impact of state constraints, controlled/uncontrolled conditions, and impact on control parameters’ optimization, sensitivity and effectiveness.

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Hydrodynamic Performance of a Pitching Float Wave Energy Converter

Cited by 7 publications

References 36 publications

Design and Optimization of PV Power Supply System for Marine Buoys

Design and Optimization of PV Power Supply System for Marine Buoys

Mooring Analysis of a Floating OWC Wave Energy Converter

Fast nonlinear Froude–Krylov force calculation for prismatic floating platforms: a wave energy conversion application case

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