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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2017-2
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research articles
06 Mar 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Wind Energy Science (WES) and is expected to appear here in due course.
Trailed vorticity modeling for aeroelastic wind turbine simulations in stand still
Georg R. Pirrung1, Helge Aa. Madsen1, and Scott Schreck2 1Wind Energy Department, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
2National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
Abstract. Current fast aeroelastic wind turbine codes suitable for certification lack an induction model for standstill conditions. A trailed vorticity model previously used as addition to a blade element momentum theory based aerodynamic model in normal operation has been extended to allow computing the induced velocities in standstill. The model is validated against analytical results for an elliptical wing in constant inflow and against stand still measurements from the NREL/NASA Phase VI unsteady experiment. The extended model obtains good results in case of the elliptical wing, but underpredicts the steady loading for the Phase VI blade in attached flow. The prediction of the dynamic force coefficient loops from the Phase VI experiment is improved by the trailed vorticity modeling in both attached flow and stall in most cases. The exception is the tangential force coefficient in stall, where the codes and measurements deviate and no clear improvement is visible. This article also contains aeroelastic simulations of the DTU 10 MW reference turbine in stand still at turbulent inflow with a fixed and idling rotor. The influence of the trailed vorticity modeling on the extreme flapwise blade root bending moment is found to be small.

Citation: Pirrung, G. R., Madsen, H. Aa., and Schreck, S.: Trailed vorticity modeling for aeroelastic wind turbine simulations in stand still, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-2, in review, 2017.
Georg R. Pirrung et al.
Georg R. Pirrung et al.

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Short summary
Current fast aeroelastic wind turbine codes suitable for certification lack an induction model for standstill conditions. A near wake model for wind turbines in operation is extended to cover these conditions. The model is validated in aerodynamic simulations of the NREL/NASA Ames Phase VI rotor, where good agreement with the experiments has been obtained in attached flow and beginning separation. Aeroelastic simulations of the DTU 10 MW turbine in standstill indicate a minor impact of the model.
Current fast aeroelastic wind turbine codes suitable for certification lack an induction model...
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