Influence of Time and Frequency Domain Wave Forcing on the Power Estimation of a Wave Energy Converter Array

Fadia Rollano, Thanh Toan Tran, Yi-Hsiang Yu, Gabriel Garci­a-Medina, Zhaoqing Yang

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

Industry-specific tools for analyzing and optimizing the design of wave energy converters (WECs) and associated power systems are essential to advancing marine renewable energy. This study aims to quantify the influence of phase information on the device power output of a virtual WEC array. We run the phase-resolving wave model FUNWAVE-TVD (Total Variation Diminishing) to generate directional waves at the PacWave South site offshore from Newport, Oregon, where future WECs are expected to be installed for testing. The two broad cases presented correspond to mean wave climates during warm months (March-August) and cold months (September-February). FUNWAVE-TVD time series of sea-surface elevation are then used in WEC-Sim, a time domain numerical model, to simulate the hydrodynamic response of each device in the array and estimate their power output. For comparison, WEC-Sim is also run with wave energy spectra calculated from the FUNWAVE-TVD simulations, which do not retain phase information, and with wave spectra computed using the phase-averaged model Simulating WAves Nearshore (SWAN). The use of spectral data in WEC-Sim requires a conversion from frequency to time domain by means of random superposition of wave components, which are not necessarily consistent because of the linear assumption implicit in this method. Thus, power response is characterized by multiple realizations of the wave climates.

Original languageAmerican English
Article number171
Number of pages18
JournalJournal of Marine Science and Engineering
Volume8
Issue number3
DOIs
StatePublished - 1 Mar 2020

Bibliographical note

Publisher Copyright:
© 2020 by the authors.

NREL Publication Number

  • NREL/JA-5000-75983

Keywords

  • FUNWAVE-TVD
  • Numerical modeling
  • PacWave south
  • SWAN
  • Wave energy converter
  • WEC-Sim

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