Fully nonlinear simulation of wave interaction with a cylindrical wave energy converter in a numerical wave tank

Abbasnia, Arash; Soares, C. Guedes

doi:10.1016/j.oceaneng.2018.01.009

Cited by 29 publications

(5 citation statements)

References 25 publications

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“…However, fully appreciating the nonlinear complexity of a real system is likely to require overly time-consuming models based on spatial discretization of at least the wetted surface [ 14 , 39 ], or the whole fluid domain [ 1 , 28 ]. Due to their computational cost, these models are unfeasible for extensive design purposes.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of parametric resonance due to hydrodynamic coupling in a realistic wave energy converter

et al. 2020

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Representative models of the nonlinear behavior of floating platforms are essential for their successful design, especially in the emerging field of wave energy conversion where nonlinear dynamics can have substantially detrimental effects on the converter efficiency. The spar buoy, commonly used for deepwater drilling, oil and natural gas extraction and storage, as well as offshore wind and wave energy generation, is known to be prone to experience parametric resonance. In the vast majority of cases, parametric resonance is studied by means of simplified analytical models, considering only two degrees of freedom (DoFs) of archetypical geometries, while neglecting collateral complexity of ancillary systems. On the contrary, this paper implements a representative 7-DoF nonlinear hydrodynamic model of the full complexity of a realistic spar buoy wave energy converter, which is used to verify the likelihood of parametric instability, quantify the severity of the parametrically excited

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of parametric resonance due to hydrodynamic coupling in a realistic wave energy converter

et al. 2020

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“…These coupling methodologies aim to combine the advances in WEC-wave interaction solvers (or the so called wave-structure interaction solvers) with existing wave propagation models. Research in WEC-wave interactions has focused on obtaining a better and more complex representation of PTO modelling [20], WEC farm layout optimization [21,22], WEC hydrodynamic performance [23][24][25][26][27][28], WEC behaviour under extreme waves [29,30] or WEC concept design [31][32][33]. This has led to different coupled models composed of different layers of complexity: (i) a linear potential flow wave propagation model coupled with a linear WEC-wave interaction solver based on the boundary element method (BEM) [34][35][36][37], (ii) a non-linear potential flow wave propagation model coupled to a linear WEC-wave interaction solver based on BEM [38], (iii) a non-linear potential flow wave propagation model coupled to a non-linear WEC-wave interaction solver based on smoothed particle hydrodynamics (SPH) [24] and (iv) a non-linear potential flow wave propagation model coupled to a non-linear WEC-wave interaction solver based on computer fluid dynamics (CFD) [39].…”

Section: Introductionmentioning

confidence: 99%

Influence of Power Take-Off Modelling on the Far-Field Effects of Wave Energy Converter Farms

Fernandez

Stratigaki

Quartier

et al. 2021

Water

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The study of the potential impact of wave energy converter (WEC) farms on the surrounding wave field at long distances from the WEC farm location (also know as “far field” effects) has been a topic of great interest in the past decade. Typically, “far-field” effects have been studied using phase average or phase resolving numerical models using a parametrization of the WEC power absorption using wave transmission coefficients. Most recent studies have focused on using coupled models between a wave-structure interaction solver and a wave-propagation model, which offer a more complex and accurate representation of the WEC hydrodynamics and PTO behaviour. The difference in the results between the two aforementioned approaches has not been studied yet, nor how different ways of modelling the PTO system can affect wave propagation in the lee of the WEC farm. The Coastal Engineering Research Group of Ghent University has developed both a parameterized model using the sponge layer technique in the mild slope wave propagation model MILDwave and a coupled model MILDwave-NEMOH (NEMOH is a boundary element method-based wave-structure interaction solver), for studying the “far-field” effects of WEC farms. The objective of the present study is to perform a comparison between both numerical approaches in terms of performance for obtaining the “far-field” effects of two WEC farms. Results are given for a series of regular wave conditions, demonstrating a better accuracy of the MILDwave-NEMOH coupled model in obtaining the wave disturbance coefficient (Kd) values around the considered WEC farms. Subsequently, the analysis is extended to study the influence of the PTO system modelling technique on the “far-field” effects by considering: (i) a linear optimal, (ii) a linear sub-optimal and (iii) a non-linear hydraulic PTO system. It is shown that modelling a linear optimal PTO system can lead to an unrealistic overestimation of the WEC motions than can heavily affect the wave height at a large distance in the lee of the WEC farm. On the contrary, modelling of a sub-optimal PTO system and of a hydraulic PTO system leads to a similar, yet reduced impact on the “far-field” effects on wave height. The comparison of the PTO systems’ modelling technique shows that when using coupled models, it is necessary to carefully model the WEC hydrodynamics and PTO behaviour as they can introduce substantial inaccuracies into the WECs’ motions and the WEC farm “far-field” effects.

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“…Longuet-Higgins and Cokelet introduced the boundary element method for the simulation of steep free surface waves [31]. Since then, BEM has been widely used for simulating the surface wave [32][33][34][35][36]. Meanwhile, comparisons of two-dimensional numerical results with laboratory experiments have shown that the potential theory can predict the characteristics of wave shoaling over slopes accurately [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for the Evolution of Internal Solitary Waves Propagating over Slope Topography

Zou

et al. 2021

JMSE

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In this study, the propagation and evolution characteristics of internal solitary waves on slope topography in stratified fluids were investigated. A numerical model of internal solitary wave propagation based on the nonlinear potential flow theory using the multi-domain boundary element method was developed and validated. The numerical model was used to calculate the propagation process of internal solitary waves on the topography with different slope parameters, including height and angle, and the influence of slope parameters, initial amplitude, and densities jump of two-layer fluid on the evolution of internal solitary waves is discussed. It was found that the wave amplitude first increased while climbing the slope and then decreased after passing over the slope shoulder based on the calculation results, and the wave amplitude reached a maximum at the shoulder of the slope. A larger height and angle of the slope can induce larger maximum wave amplitude and more obvious tail wave characteristics. The wave amplitude gradually decreased, and a periodic tail wave was generated when propagating on the plateau after passing the slope. Both frequency and height of the tail wave were affected by the geometric parameters of the slope bottom; however, the initial amplitude of the internal solitary wave only affects the tail wave height, but not the frequency of the tail wave.

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Fully nonlinear simulation of wave interaction with a cylindrical wave energy converter in a numerical wave tank

Cited by 29 publications

References 25 publications

Numerical investigation of parametric resonance due to hydrodynamic coupling in a realistic wave energy converter

Numerical investigation of parametric resonance due to hydrodynamic coupling in a realistic wave energy converter

Influence of Power Take-Off Modelling on the Far-Field Effects of Wave Energy Converter Farms

Numerical Simulation for the Evolution of Internal Solitary Waves Propagating over Slope Topography

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