Frederik Ettrup Brink and Nicolai Gayle Nygaard

Shear and Turbulence

Profiles Offshore

Offshore turbulence profiles

2

9 offshore met masts

Sites in northern Europe

MSc thesis by Daniel Pollak (2014)

-Co-supervised by DTU Wind Energy

and University of Oldenburg

Turbulence intensity profiles

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Similar across sites

4

90th percentile turbulence intensity

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Implications

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Increased hub height means less turbulence

Power performance

Wakes

Design loads

North Sea, UK

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Negative shear

High shear

Very low shear

Profiles

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Very low shear

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High shear

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Negative shear

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Shear distribution binned by sector

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Turbulence vs shear

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