Abstract
This paper deals with modelling of wake dynamics under influence of atmospheric stability conditions different from neutral. In particular, it is investigated how the basic split in turbulent scales, on which the Dynamic Wake Meandering model is based, can be utilized to include atmospheric stability effects in this model. This is done partly by analyzing a large number of turbulence spectra obtained from sonic measurements, partly by analyzing dedicated full-scale LiDAR measurements from which wake dynamics can be directly resolved. The theory behind generalizing the Dynamic Wake Meandering model to non-neutral conditions are summarized and linked to the results of the full-scale experimental results. It is concluded that there is a qualitative match between the conjecture behind the Dynamic Wake Meandering model and the dependence of turbulence structure on atmospheric stability conditions, and consequently that there is a potential for generalizing the Dynamic Wake Meandering model to include effects of atmospheric stability.
Highlights
Wakes cause significant power losses in wind farms
It is concluded that there is a qualitative match between the conjecture behind the Dynamic Wake Meandering model and the dependence of turbulence structure on atmospheric stability conditions, and that there is a potential for generalizing the Dynamic Wake Meandering model to include effects of atmospheric stability
Whereas friction is dictating the structure of turbulence in the atmospheric boundary layer (ABL) under neutral conditions, buoyancy effects adds to friction when it comes to the turbulence structure under ABL stability conditions different from neutral
Summary
Wake meandering under non-neutral atmospheric stability conditions - theory and facts. This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 625 012036 (http://iopscience.iop.org/1742-6596/625/1/012036) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 192.38.90.17 This content was downloaded on 24/06/2015 at 10:53 Please note that terms and conditions apply. G C Larsen, E Machefaux and A Chougule Department of Wind Energy, Technical University of Denmark P.O. Box 49, 4999 Roskilde, Denmark
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