Towards a Simplified DynamicWake Model Using POD Analysis

David Bastine, Björn Witha, Matthias Wächter and Joachim Peinke
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David Bastine: Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany
Björn Witha: Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany
Matthias Wächter: Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany
Joachim Peinke: Institute of Physics, ForWind, University of Oldenburg, Ammerländer Herrstr. 136, 26129 Oldenburg, Germany

Energies, 2015, vol. 8, issue 2, 1-26

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.

Keywords: wake; proper orthogonal decomposition (POD); wake model; meandering; large eddy simulations (LES); actuator disk; loads; dynamic wake; reduced order model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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