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-2017-52
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
22 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
From wake steering to flow control
Paul Fleming, Jennifer Annoni, Matthew Churchfield, Luis Martinez, Kenny Gruchalla, Michael Lawson, and Patrick Moriarty National Wind Technology Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
Abstract. In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices are shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake steering in oppositely signed yaw angles. We motivate the development of new physics for control-oriented engineering models of wind farm control, which include the effects of these large-scale flow structures. Such a new model would improve the predictability of control-oriented models. Results presented in this paper indicate that wind farm control strategies, based on new control-oriented models with new physics, that target total flow control over wake redirection may be different, and perhaps more effective, than current approaches. We propose that wind farm control and wake steering should be thought of as the generation of large-scale flow structures, which will aid in the improved performance of wind farms.

Citation: Fleming, P., Annoni, J., Churchfield, M., Martinez, L., Gruchalla, K., Lawson, M., and Moriarty, P.: From wake steering to flow control, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-52, in review, 2017.
Paul Fleming et al.
Paul Fleming et al.
Paul Fleming et al.

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This paper investigates the role of flow structures in wind farm control through yaw misalignment. A pair of counter-rotating vortices are shown to be important in deforming the shape of the wake and explaining observed phenomena in high-fidelity simulations. The paper indicates that wind farm control strategies, based on new control-oriented models with new physics, that target total flow control over wake redirection may be different, and perhaps more effective, than current approaches.
This paper investigates the role of flow structures in wind farm control through yaw...
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