Mérigaud, Alexis and Ringwood, John (2018) A Nonlinear Frequency-Domain Approach for Numerical Simulation of Wave Energy Converters. IEEE Transactions on Sustainable Energy, 9 (1). pp. 86-94. ISSN 1949-3029

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Abstract

Nonlinear, analytical wave-energy converter (WEC) models are generally simulated through time-domain (TD) numerical integration. However, the relatively high computational requirements of TD integration are not compatible with applications where a large number of simulations are needed. Spectral domain (SD) linearization has also been proposed to take into account some nonlinear effects, while being much faster than TD integration. However, as explained in this paper, such SD models have limited accuracy, and cannot extend to the static nonlinear forces. In this paper, a nonlinear frequency-domain (NLFD) method is investigated forWEC simulation, using a projection of the dynamical equations onto a basis of trigonometric functions. A comparison with TD integration (second-order Runge−Kutta—RK2) and SD methods is provided, through theoretical considerations, and by means of numerical simulations based on two case studies. In the cases considered, the proposed NLFD method allows for significant computational savings compared to RK2 integration, without requiring any approximation for the radiation forces. NLFD thus shows promising potential for applications involving extensive WEC simulation, such as power production assessment, while preserving the WEC model accuracy. Although slower than SD, NLFD has significant benefits in terms of accuracy and range of applicability.

Item Type:	Article
Keywords:	Frequency domain; galerkin method; nonlinearities; numerical simulation; spectral domain; time domain; wave energy converters;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
Item ID:	12452
Identification Number:	https://doi.org/10.1109/TSTE.2017.2716826
Depositing User:	Professor John Ringwood
Date Deposited:	11 Feb 2020 17:31
Journal or Publication Title:	IEEE Transactions on Sustainable Energy
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
Refereed:	Yes
Funders:	Science Foundation Ireland (SFI), Marine Renewable Ireland Centre
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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