Weakly nonlinear modeling of submerged wave energy converters

Letournel, Lucas; Chauvigné, Camille; Gelly, Baptiste; Babarit, Aurélien; Ducrozet, Guillaume; Ferrant, P.

doi:10.1016/j.apor.2018.03.014

Cited by 23 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In this section, the governing equations of the weakly nonlinear potential flow theory based on the weak-scatterer theory are described. More details may be found in [6,7,8].…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

“…At Ecole Centrale de Nantes, a numerical tool, named WS_CN, based on the time-domain weakly nonlinear potential flow theory using the weak-scatterer hypothesis, has been under development since 2012. It has been used with single submerged bodies [6], single surface-piercing bodies [7] and has been extended to multibody simulations [8]. In these previous studies, the mesh generator of WS_CN is based on a 2 Copyright © 20xx by ASME semi-analytical approach.…”

Section: Introductionmentioning

confidence: 99%

Development of a Panel Cutting Method Coupled With an Unsteady Potential Flow Model Based on the Weak-Scatterer Approximation

Wuillaume

Ferrant

Babarit

et al. 2019

Volume 10: Ocean Renewable Energy

Self Cite

View full text Add to dashboard Cite

This paper presents a new mesh strategy for unsteady potential flow based solvers. It is based on the coupling between a panel cutting method used for the body mesh and an advance front method to generate the free surface mesh. The goal is to deal with complex geometries for time-domain simulations for marine operations. Firstly, the new mesh generation process is presented in details. Then, two validation tests are presented, using an academic geometry (vertical surface-piercing cylinder) and a complex geometry (FPSO).

show abstract

“…In the NLFK modeling approach, diffraction and radiation effects are assumed to be small and linear, based on the assumption that the characteristic dimension of the device is significantly smaller than the wavelength. In fact, including such non-linearities would require weakly nonlinear potential flow models, such as [22,23], or fully nonlinear potential flow models, such as [24,25], which would produce a significant increase in complexity and computational burden with little improvement in accuracy. Consequently, such models realize a pair of accuracy-computational times not suitable for the parametric studies object of this paper.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Mooring Line Parameters in Inducing Parametric Resonance on the Spar-Buoy Oscillating Water Column Wave Energy Converter

Giorgi

Gomes

Bracco

et al. 2020

JMSE

View full text Add to dashboard Cite

Although it is widely accepted that accurate modeling of wave energy converters is essential for effective and reliable design, it is often challenging to define an accurate model which is also fast enough to investigate the design space or to perform extensive sensitivity analysis. In fact, the required accuracy is usually brought by the inclusion of nonlinearities, which are often time-consuming to compute. This paper provides a computationally efficient meshless nonlinear Froude–Krylov model, including nonlinear kinematics and an integral formulation of drag forces in six degrees of freedom, which computes almost in real-time. Moreover, a mooring system model with three lines is included, with each line comprising of an anchor, a jumper, and a clump weight. The mathematical model is used to investigate the highly-nonlinear phenomenon of parametric resonance, which has particularly detrimental effects on the energy conversion performance of the spar-buoy oscillating water column (OWC) device. Furthermore, the sensitivity on changes to jumper and clump-weight masses are discussed. It is found that mean drift and peak loads increase with decreasing line pre-tension, eventually leading to a reduction of the operational region. On the other hand, the line pre-tension does not affect power production efficiency, nor is it able to avoid or significantly limit the severity of parametric instability.

show abstract

Weakly nonlinear modeling of submerged wave energy converters

Cited by 23 publications

References 15 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

Development of a Panel Cutting Method Coupled With an Unsteady Potential Flow Model Based on the Weak-Scatterer Approximation

The Effect of Mooring Line Parameters in Inducing Parametric Resonance on the Spar-Buoy Oscillating Water Column Wave Energy Converter

Contact Info

Product

Resources

About