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Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany





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Academic Editor: Frede Blaabjerg

Abstract 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





Author: David Bastine * , Björn Witha, Matthias Wächter and Joachim Peinke

Source: http://mdpi.com/



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