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Frederik Ettrup Brink and Nicolai Gayle Nygaard Shear and Turbulence Profiles Offshore

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Frederik Ettrup Brink and Nicolai Gayle Nygaard

Shear and Turbulence

Profiles Offshore

Offshore turbulence profiles

9 offshore met masts

Sites in northern Europe

MSc thesis by Daniel Pollak (2014)

-Co-supervised by DTU Wind Energy

and University of Oldenburg

Page 3: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Turbulence intensity profiles

Page 4: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Similar across sites

Page 5: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

90th percentile turbulence intensity

Page 6: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Implications

Increased hub height means less turbulence

Power performance

Wakes

Design loads

Page 7: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

North Sea, UK

Negative shear

High shear

Very low shear

Profiles

Very low shear

Page 10: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

High shear

Page 11: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Negative shear

Page 12: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Shear distribution binned by sector

Page 13: Shear and Turbulence Profiles Offshore - · PDF fileOffshore turbulence profiles 2 9 offshore met masts Sites in northern Europe MSc thesis by Daniel Pollak (2014) -Co-supervised by

Turbulence vs shear

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