Trabucchi, Davide and Vollmer, Lukas and Kühn, Martin (2017) 3-D shear-layer model for the simulation of multiple wind turbine wakes: description and first assessment. Wind energy science, 2 (2). pp. 569-586. ISSN 2366-7451

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Abstract

The number of turbines installed in offshore wind farms has strongly increased in the last years and at the same time the need for more precise estimations of the wind farm efficiency too. In this sense, the interaction between wakes has become a relevant aspect for the definition of a wind farm layout, for the assessment of its annual energy yield and for the evaluation of wind turbine fatigue loads. For this reason, accurate models for multiple overlapping wakes are a main concern of the wind energy community. Existing engineering models can only simulate single wakes, which are superimposed when they are interacting in a wind farm. This method is a practical solution, but it is not fully supported by a physical background. The limitation to single wakes is given by the assumption that the wake is axisymmetric. As an alternative, we propose a new shear-layer model that is based on the existing engineering wake models but is extended to also simulate non-axisymmetric wakes. In this paper, we present the theoretical background of the model and four application cases. We evaluate the new model for the simulation of single and multiple wakes using large-eddy simulations as reference. In particular, we report the improvements of the new model predictions in comparison to a sum-of-squares superposition approach for the simulation of three interacting wakes. The lower deviation from the reference considering single and multiple wakes encourages the further development of the model and promises a successful application for the simulation of wind farm flows.

Item Type:	Article
Additional Information:	Publiziert mit Hilfe des DFG-geförderten Open Access-Publikationsfonds der Carl von Ossietzky Universität Oldenburg.
Subjects:	Science and mathematics > Physics Technology, medicine, applied sciences > Civil engineering and environmental protection engineering
Divisions:	Faculty of Mathematics and Science > Institute of Physics (IfP)
Date Deposited:	15 Feb 2018 14:29
Last Modified:	27 Feb 2018 08:53
URI:	https://oops.uni-oldenburg.de/id/eprint/3500
URN:	urn:nbn:de:gbv:715-oops-35816
DOI:	10.5194/wes-2-569-2017
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