Mérigaud, Alexis and Ringwood, John (2017) Non-Linear Frequency-Domain WEC Simulation:Numerical Case Studies and Practical Issues. Proceedings of the 12th European Wave and Tidal Energy Conference 27th Aug -1st Sept 2017 (848). pp. 1-10. ISSN 2309-1983

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Abstract

A non-linear frequency-domain (NLFD) methodology has been recently proposed for the computationally-efficient numerical simulation of wave energy converters (WECs), taking into account non-linear effects in the device dynamics. The primary objective of this paper is to contribute making the wave energy academic and industrial community familiar with the NLFD formulation, by giving researchers and engineers more insight with respect to the practical issues related to the method, as well as its possible application areas. The NLFD method is briefly described, and the main associated practical issues are detailed: robustness and convergence, duration and time-step of the simulations, and finally random generation method for the input wave signal. In terms of WEC dynamics, numerical applications show that NLFD allows for handling strong non-linear dynamics, provided that the WEC outputs remain smooth. The method also allows for modelling cross-frequency energy transfers. In contrast, NLFD does not seem suitable for the non-smooth dynamics related to some specific PTO designs. The small computational time associated with NLFD method makes it particularly advantageous for applications involving a large number of simulations, such as WEC parametric optimisation, power assessment, and WEC dimensioning and reliability.

Item Type:	Article
Keywords:	Wave energy converter; Non-linear model; Numerical simulation; Frequency-domain; Newton method;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
Item ID:	12464
Depositing User:	Professor John Ringwood
Date Deposited:	20 Feb 2020 15:15
Journal or Publication Title:	Proceedings of the 12th European Wave and Tidal Energy Conference 27th Aug -1st Sept 2017
Publisher:	European Wave and Tidal Energy Conference 2017
Refereed:	Yes
URI:
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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