An Analytical Model for the Effect of Vertical Wind Veer on Wind Turbine Wakes

Mahdi Abkar*, Jens Sørensen, Fernando Porté-Agel

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In this study, an analytical wake model for predicting the mean velocity field downstream of a wind turbine under veering incoming wind is systematically derived and validated. The new model, which is an extended version of the one introduced by Bastankhah and Porté-Agel, is based upon the application of mass conservation and momentum theorem and considering a skewed Gaussian distribution for the wake velocity deficit. Particularly, using a skewed (instead of axisymmetric) Gaussian shape allows accounting for the lateral shear in the incoming wind induced by the Coriolis force. This analytical wake model requires only the wake expansion rate as an input parameter to predict the mean wake flow downstream. The performance of the proposed model is assessed using the large-eddy simulation (LES) data of a full-scale wind turbine wake under the stably stratified condition. The results show that the proposed model is capable of predicting the skewed structure of the wake downwind of the turbine, and its prediction for the wake velocity deficit is in good agreement with the high-fidelity simulation data.
Original languageEnglish
Article number1838
JournalEnergies
Volume11
Issue number7
ISSN1996-1073
DOIs
Publication statusPublished - 2018

Keywords

  • Analytical wake model
  • Large-eddy simulation
  • Coriolis force
  • Vertical wind veer

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