Comparison of Fully Nonlinear and Weakly Nonlinear Potential Flow Solvers for the Study of Wave Energy Converters Undergoing Large Amplitude Motions

Letournel, Lucas; Ferrant, P.; Babarit, Aurélien; Ducrozet, Guillaume; Harris, Jeffrey C.; Benoît, Michel; Dombre, Emmanuel

doi:10.1115/omae2014-23912

Cited by 8 publications

(13 citation statements)

References 14 publications

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“…Weakly nonlinear and fully nonlinear potential flow models are both in an early stage of development and so further research is necessary to extract some more definitive conclusions. [177] presents a comparison of the weakly and fully nonlinear models analysing a fully submerged cylinder, whose conclusion is that both methods give a good agreement in the hydrodynamic coefficients. Although the low complexity of the analysis is recognised (a fully submerged cylinder), it remarks that expectations have been met with both methods.…”

Section: 22mentioning

confidence: 99%

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Peñalba

Giorgi

Ringwood

2017

Renewable and Sustainable Energy Reviews

183

123

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The wave energy sector has made and is still doing a great effort in order to open up a niche in the energy market, working on several and diverse concepts and making advances in all aspects towards more efficient technologies. However, economic viability has not been achieved yet, for which maximisation of power production over the full range of sea conditions is crucial. Precise mathematical models are essential to accurately reproduce the behaviour, including nonlinear dynamics, and understand the performance of wave energy converters. Therefore, nonlinear models must be considered, which are required for power absorption assessment, simulation of devices motion and model-based control systems. Main sources of nonlinear dynamics within the entire chain of a wave energy converter-incoming wave trains, wave-structure interaction, power takeoff systems or mooring lines-are identified, with especial attention to the wave-device hydrodynamic interaction, and their influence is studied in the present paper for different types of converters. In addition, different approaches to model nonlinear wave-device interaction are presented, highlighting their advantages and drawbacks. Besides the traditional Navier-Stokes equations or potential flow methods, 'new' methods such as system-identification models, smoothed particle hydrodynamics or nonlinear potential flow methods are analysed.

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Section: 22mentioning

confidence: 99%

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Peñalba

Giorgi

Ringwood

2017

Renewable and Sustainable Energy Reviews

183

123

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“…The method is more theoretically consistent than the partially nonlinear model but inevitably requires more computational effort. A comparative study of a fully nonlinear and a nonlinear weak-scatterer method is ongoing 100 and such investigations are likely to indicate the range of applicability of such methods. Weakly nonlinear methods are applied in order to include the first higher order nonlinear contributions in the perturbation expansion approach to solving the wave-body interaction problem.…”

Section: Discussionmentioning

confidence: 97%

“…In fact, Letournel et al 100 present a comparison of a FNPF code and a 'weakly nonlinear' (weakscatterer approximation) code, both of which are dedicated to the study of WECs. Both codes are in the early stages of development and this preliminary comparison of the simulation results for the prescribed motion of a submerged cylinder shows good agreement.…”

Section: Weak Scatterer Approximationmentioning

confidence: 99%

Nonlinear hydrodynamic and real fluid effects on wave energy converters

Wolgamot

Fitzgerald

2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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Ocean wave energy has been of interest since at least the mid-1970s and great advances in the understanding of the fundamental principles of wave energy extraction and converter modelling have been made using linear hydrodynamic analysis. This paper reviews efforts that have been made to use nonlinear hydrodynamics to analyse wave energy converter behaviour and performance. Both 'partially nonlinear' and fully nonlinear potential flow methods, as well as computational fluid dynamics methods solving the Navier-Stokes equations and smoothed particle hydrodynamics have been used for this purpose and are reviewed here. These more complex methods have been applied primarily to single devices, so array and mooring line interactions are not considered. While a number of studies have been performed in these areas and results are encouraging, further advances are required to give accurate prediction or reproduction of experimental results.

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“…There are a few well-known nonlinear potential flow solvers from the naval architecture field (AEGIR [81] and LAMP (Large Amplitude Motion Program) [82]). Letournel et al [83] performed a comparison of such nonlinear potential flow models with those that rely on superposition. Greenhow et al [84] presented an analysis of Salter's "duck" in extreme waves using a two-dimensional nonlinear potential flow code and experimental testing.…”

Section: Numerical Modelingmentioning

confidence: 99%

A Survey of WEC Reliability, Survival and Design Practices

Coe

Rij

2017

Energies

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A wave energy converter must be designed to survive and function efficiently, often in highly energetic ocean environments. This represents a challenging engineering problem, comprising systematic failure mode analysis, environmental characterization, modeling, experimental testing, fatigue and extreme response analysis. While, when compared with other ocean systems such as ships and offshore platforms, there is relatively little experience in wave energy converter design, a great deal of recent work has been done within these various areas. This paper summarizes the general stages and workflow for wave energy converter design, relying on supporting articles to provide insight. By surveying published work on wave energy converter survival and design response analyses, this paper seeks to provide the reader with an understanding of the different components of this process and the range of methodologies that can be brought to bear. In this way, the reader is provided with a large set of tools to perform design response analyses on wave energy converters.

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Comparison of Fully Nonlinear and Weakly Nonlinear Potential Flow Solvers for the Study of Wave Energy Converters Undergoing Large Amplitude Motions

Cited by 8 publications

References 14 publications

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Nonlinear hydrodynamic and real fluid effects on wave energy converters

A Survey of WEC Reliability, Survival and Design Practices

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