Berlin 2015 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Focus Session: Statistics of fully developed turbulence
DY 32.10: Vortrag
Mittwoch, 18. März 2015, 18:00–18:15, BH-N 243
the intermittent behavior of DDES simulation of fractal-generated turbulence — •Mohamed Cherif Mihoubi1, Bernhard Stoevesandt1, and Joachim Peinke1,2 — 1Fraunhofer Institute for Wind Energy and Energy System Technology IWES, Oldenburg, Germany — 2ForWind, Center for Wind Energy Research, Oldenburg, Germany
In order to study the relevant sources of noise from wind turbines under real atmospheric inflow conditions, we investigate CFD simulations of fractal generated turbulence. The fractal grid used in this simulation is based on an experimental set-up to be able to validate the simulation results. The Results showed that in the production region of the turbulence the pdfs are roughly Gaussian, the deviation from the Gaussian distribution starts at 0.9 m and lasts up to 2 m behind the fractal grid. In this region the statistics show highly intermittent behavior with heavy tails which show similar behavior to atmospheric turbulence (please see [1],[2]). From 2 m on, the pdfs become Gaussian again. Additionally, energy spectrum, integral length scale and other quantities are evaluated on the stream-wise directions. In comparison with wind tunnel data, the effect of turbulence model in analyzed
[1] Morales, A., Wächter, M. and Peinke, J. (2012), Characterization of wind turbulence by higher-order statistics,Wind Energ., 15: 391*406. doi: 10.1002/we.478
[2] Mücke, T., Kleinhans, D. and Peinke, J. (2011), Atmospheric turbulence and its influence on the alternating loads on wind turbines, Wind Energ., 14: 301*316. doi: 10.1002/we.422