Wake effects behind a farm of wave energy converters for irregular long-crested and short-crested waves

Peter A Troch, Charlotte Beels, Julien De Rouck, Griet De Backer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

The contribution of wave energy to the renewable energy supply is rising. To extract a considerable amount of wave power, Wave Energy Converters (WECs) are arranged in several rows or in a 'farm'. WECs in a farm are interacting (e.g. the presence of other WECs influence the operational behaviour of a single WEC) and the overall power absorption is affected. In this paper wake effects in the lee of a single WEC and multiple WECs of the overtopping type, where the water volume of overtopped waves is first captured in a basin above mean sea level and then drains back to the sea through hydro turbines, are studied using the time-dependent mild-slope equation model MILDwave. The wake behind a single WEC is investigated for long-crested and short-crested incident waves. The wake becomes wider for larger wave peak periods. An increasing directional spreading results in a faster wave regeneration and a shorter wake behind the WEC. The wake in the lee of multiple WECs is calculated for two different farm lay-outs, i.e. an aligned grid and a staggered grid, with varying lateral and longitudinal spacing. The wave power redistribution in and behind each farm lay-out is studied in detail using MILDwave. In general, the staggered grid results in the highest overall wave power absorption.

Original languageEnglish (US)
Title of host publicationProceedings of the Coastal Engineering Conference
Publication statusPublished - 2010
Externally publishedYes
Event32nd International Conference on Coastal Engineering, ICCE 2010 - Shanghai, China
Duration: Jun 30 2010Jul 5 2010

Other

Other32nd International Conference on Coastal Engineering, ICCE 2010
CountryChina
CityShanghai
Period6/30/107/5/10

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Keywords

  • Farm lay-out
  • Mild slope equations
  • Renewable energy
  • Wake effect
  • Wave energy converter
  • Wave propagation modeling

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Oceanography

Cite this

Troch, P. A., Beels, C., De Rouck, J., & De Backer, G. (2010). Wake effects behind a farm of wave energy converters for irregular long-crested and short-crested waves. In Proceedings of the Coastal Engineering Conference