Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2017-47
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
25 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Simulation of transient gusts on the NREL5 MW wind turbine using CFD
Annika Länger-Möller DLR Braunschweig, Lilienthalplatz 7, 38108 Braunschweig
Abstract. The performed work presents a procedure, implemented in the CFD-solver THETA, to propagate longitudinal transient gusts through a flow field by using a resolved gust approach. Both, the gust strike of a 1–cos()-gust and an extreme operating gust following the IEC-64100-1 standard, on the generic NREL 5MW wind turbine at rated operating conditions are investigated with CFD. The impact of both gusts on pressure distributions, rotor thrust, rotor torque, and flow states on the blade are examined and quantified. The flow states on the rotor blade before the gust strike and at maximum and minimum gust velocity are compared. An increased blade loading is detectable in the pressure coefficients and integrated blade loads. The friction force coefficients indicate the dynamic separation and re-attachment of the flow during the gust.

Citation: Länger-Möller, A.: Simulation of transient gusts on the NREL5 MW wind turbine using CFD, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-47, in review, 2017.
Annika Länger-Möller
Annika Länger-Möller
Annika Länger-Möller

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Short summary
The capability of the DLR flow solver to simulate a wind turbine operating in an extreme gust event is presented by propagating the extreme gust through the flow field. The behaviour of the aerodynamic rotor loading and flow characteristics on the rotor blades were evaluated. The long term perspective is to improve the understanding of the instationary aerodynamics on the wind turbine. This will help to improve design methods of the wind turbine.
The capability of the DLR flow solver to simulate a wind turbine operating in an extreme gust...
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