WAKE EFFECTS BEHIND A FARM OF WAVE ENERGY CONVERTERS FOR IRREGULAR LONG-CRESTED AND SHORT-CRESTED WAVES

Peter Troch; Charlotte Beels; Julien De Rouck; Griet De Backer

doi:10.9753/icce.v32.waves.53

No. 32 (2010), Waves

No. 32 (2010)

WAKE EFFECTS BEHIND A FARM OF WAVE ENERGY CONVERTERS FOR IRREGULAR LONG-CRESTED AND SHORT-CRESTED WAVES

Waves

https://doi.org/10.9753/icce.v32.waves.53

Published 2011-02-01

Peter Troch⁺⁻
Charlotte Beels⁺⁻
Julien De Rouck⁺⁻
Griet De Backer⁺⁻

Peter Troch

Ghent University

Charlotte Beels

Ghent University

Julien De Rouck

Ghent University

Griet De Backer

Ghent University

Proceedings of the 32nd International Conference

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Keywords

wave propagation modeling
mild slope equations
wave energy converter
wake effect
farm lay-out
renewable energy

How to Cite

Troch, P., Beels, C., De Rouck, J., & De Backer, G. (2011). WAKE EFFECTS BEHIND A FARM OF WAVE ENERGY CONVERTERS FOR IRREGULAR LONG-CRESTED AND SHORT-CRESTED WAVES. Coastal Engineering Proceedings, 1(32), waves.53. https://doi.org/10.9753/icce.v32.waves.53

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.

https://doi.org/10.9753/icce.v32.waves.53

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References

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WAKE EFFECTS BEHIND A FARM OF WAVE ENERGY CONVERTERS FOR IRREGULAR LONG-CRESTED AND SHORT-CRESTED WAVES

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