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Energies 2015, 8(2), 895-920;

Towards a Simplified DynamicWake Model Using POD Analysis

Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 21 August 2014 / Revised: 29 December 2014 / Accepted: 20 January 2015 / Published: 28 January 2015
(This article belongs to the Special Issue Wind Turbines 2014)
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We apply a modified proper orthogonal decomposition (POD) to large eddy simulation data of a wind turbine wake in a turbulent atmospheric boundary layer. The turbine is modeled as an actuator disk. Our analysis mainly focuses on the pragmatic identification of spatial modes, which yields a low order description of the wake flow. This reduction to a few degrees of freedom is a crucial first step for the development of simplified dynamic wake models based on modal decompositions. It is shown that only a few modes are necessary to capture the basic dynamical aspects of quantities that are relevant to a turbine in the wake flow. Furthermore, we show that the importance of the individual modes depends on the relevant quantity chosen. Therefore, the optimal choice of modes for a possible model could in principle depend on the application of interest. We additionally present a possible interpretation of the extracted modes by relating them to the specific properties of the wake. For example, the first mode is related to the horizontal large-scale movement. View Full-Text
Keywords: wake; proper orthogonal decomposition (POD); wake model; meandering; large eddy simulations (LES); actuator disk; loads; dynamic wake; reduced order model wake; proper orthogonal decomposition (POD); wake model; meandering; large eddy simulations (LES); actuator disk; loads; dynamic wake; reduced order model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bastine, D.; Witha, B.; Wächter, M.; Peinke, J. Towards a Simplified DynamicWake Model Using POD Analysis. Energies 2015, 8, 895-920.

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