Effect of Coriolis force on a wind farm wake

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Abstract

The effect of the Coriolis force on the wake of a wind farm in a conventionally neutral and a stable boundary layer is investigated using large eddy simulations. We find that the average ow angle varies with the downstream position in the wind farm. In the entrance region of the wind farm, the ow blockage and wind veer create a positive gradient of the vertical flux (u′u′) at hub-height, which causes a counter-clockwise ow deection in the Northern hemisphere, when observed from above. Further downstream, the vertical entrainment of air from the upper layers of the boundary layer generates a negative gradient of the vertical flux (u′u′) at hub-height, which results in a clockwise ow deection in the Northern hemisphere. The deection is more pronounced for the stable boundary layer than for the conventionally neutral boundary layer. In addition, we find that the wake deection has a significant impact on the power production of turbines further downstream in the wind farm.

Original languageEnglish
Article number012026
JournalJournal of physics: Conference series
Volume1256
Issue number1
DOIs
Publication statusPublished - 22 Jul 2019
EventWake Conference 2019 - Visby, Sweden
Duration: 22 May 201924 May 2019
https://standupforwind.se/konferenser-och-moten/wake-conference-2019/

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wakes
boundary layers
hubs
Northern Hemisphere
gradients
entrainment
large eddy simulation
turbines
entrances
counters
causes
air

Cite this

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title = "Effect of Coriolis force on a wind farm wake",
abstract = "The effect of the Coriolis force on the wake of a wind farm in a conventionally neutral and a stable boundary layer is investigated using large eddy simulations. We find that the average ow angle varies with the downstream position in the wind farm. In the entrance region of the wind farm, the ow blockage and wind veer create a positive gradient of the vertical flux (u′u′) at hub-height, which causes a counter-clockwise ow deection in the Northern hemisphere, when observed from above. Further downstream, the vertical entrainment of air from the upper layers of the boundary layer generates a negative gradient of the vertical flux (u′u′) at hub-height, which results in a clockwise ow deection in the Northern hemisphere. The deection is more pronounced for the stable boundary layer than for the conventionally neutral boundary layer. In addition, we find that the wake deection has a significant impact on the power production of turbines further downstream in the wind farm.",
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Effect of Coriolis force on a wind farm wake. / Gadde, Srinidhi Nagarada; Stevens, Richard J.A.M.

In: Journal of physics: Conference series, Vol. 1256, No. 1, 012026, 22.07.2019.

Research output: Contribution to journalConference articleAcademicpeer-review

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AU - Stevens, Richard J.A.M.

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N2 - The effect of the Coriolis force on the wake of a wind farm in a conventionally neutral and a stable boundary layer is investigated using large eddy simulations. We find that the average ow angle varies with the downstream position in the wind farm. In the entrance region of the wind farm, the ow blockage and wind veer create a positive gradient of the vertical flux (u′u′) at hub-height, which causes a counter-clockwise ow deection in the Northern hemisphere, when observed from above. Further downstream, the vertical entrainment of air from the upper layers of the boundary layer generates a negative gradient of the vertical flux (u′u′) at hub-height, which results in a clockwise ow deection in the Northern hemisphere. The deection is more pronounced for the stable boundary layer than for the conventionally neutral boundary layer. In addition, we find that the wake deection has a significant impact on the power production of turbines further downstream in the wind farm.

AB - The effect of the Coriolis force on the wake of a wind farm in a conventionally neutral and a stable boundary layer is investigated using large eddy simulations. We find that the average ow angle varies with the downstream position in the wind farm. In the entrance region of the wind farm, the ow blockage and wind veer create a positive gradient of the vertical flux (u′u′) at hub-height, which causes a counter-clockwise ow deection in the Northern hemisphere, when observed from above. Further downstream, the vertical entrainment of air from the upper layers of the boundary layer generates a negative gradient of the vertical flux (u′u′) at hub-height, which results in a clockwise ow deection in the Northern hemisphere. The deection is more pronounced for the stable boundary layer than for the conventionally neutral boundary layer. In addition, we find that the wake deection has a significant impact on the power production of turbines further downstream in the wind farm.

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