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Fluid-structure coupled computations of the NREL 5MW wind turbine blade during standstill

: Dose, Bastian; Rahimi, Hamid; Herráez, Iván; Stoevesandt, Bernhard; Peinke, Joachim

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TU München; European Academy of Wind Energy -EAWE-:
6th International Conference "The Science of Making Torque from Wind", TORQUE 2016 : 5-7 October 2016, Munich, Germany; Proceedings
Bristol: IOP Publishing, 2016 (Journal of physics. Conference series 753)
Art. 022034, 11 pp.
International Conference "The Science of Making Torque from Wind" (TORQUE) <6, 2016, Munich>
Conference Paper, Electronic Publication
Fraunhofer IWES ()

This work is aimed at investigating the aero-elastic behavior of a wind turbine blade subjected to strong wind speeds during standstill. This type of investigation still remains a challenge for most wind turbine simulation codes. For this purpose, a new developed high fidelity framework for fluid-structure coupled computations of wind turbines is presented and numerical simulations are conducted on the NREL 5MW reference wind turbine. The framework couples the open-source Computational Fluid Dynamics (CFD) toolbox OpenFOAM with an in-house beam solver, based on the Geometrically Exact Beam Theory (GEBT). The obtained results are compared to the aero-elastic tool FAST, which is based on the Blade Element Momentum theory (BEM) and can be considered as a state-of-the-art wind turbine simulation code. The evaluation of the fluid-structure coupled CFD simulations reveals clear differences in the results compared to FAST. While the mean deflections show a reasonable agreement , the dynamics of the edgewise deflections differ significantly. Furthermore, the effect of an explicit coupling versus an implicit coupling strategy on the results is investigated.