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-2018-9
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
15 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations
Jörn Nathan, Christian Masson, and Louis Dufresne ÉTS, Univ. du Québec, Mechanical Engineering, Montréal H3C 1K3, Canada
Abstract. The interaction between wind turbines through their wakes is an important aspect of the conception and operation of a wind farm. Wakes are characterized by an elevated turbulence level and a noticable velocity deficit which causes a decrease in energy output and fatigue on downstream turbines. In order to gain a better understanding of this phenomenon this works uses large-eddy simulations together with an actuator line model and different ambient turbulences imposed as boundary conditions. This is achieved by using the SOWFA framework from NREL (USA) which is first validated against another popular CFD framework for wind energy, EllipSys3D, and then verified against the experimental results from the MEXICO and NEW MEXICO wind tunnel experiments. By using the predicted torque as a global indicator, the optimal width of the distribution kernel for the actuator line is determined for different grid resolutions. Then the rotor is immersed in homogeneous isotropic turbulence and a shear layer turbulence with different turbulence intensities, allowing to determine how far downstream the effect of the distinct blades is discernible. This can be used as an indicator for the extents of the near wake for different flow conditions
Citation: Nathan, J., Masson, C., and Dufresne, L.: Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2018-9, in review, 2018.
Jörn Nathan et al.
Jörn Nathan et al.
Jörn Nathan et al.

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Short summary
The interaction between wind turbines through their wakes is an important aspect of the conception and operation of a wind farm. Wakes are characterized by an elevated turbulence level and a noticeable velocity deficit which causes a decrease in energy output and fatigue on downstream turbines. In order to gain a better understanding of this phenomenon this works uses large-eddy simulations together with an actuator line model and different ambient turbulences.
The interaction between wind turbines through their wakes is an important aspect of the...
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