Preprints
https://doi.org/10.5194/wes-2022-56
https://doi.org/10.5194/wes-2022-56
 
14 Jul 2022
14 Jul 2022
Status: this preprint is currently under review for the journal WES.

Brief communication: A clarification of wake recovery mechanisms

Maarten Paul van der Laan, Mads Baungaard, and Mark Kelly Maarten Paul van der Laan et al.
  • Technical University of Denmark, DTU Wind Energy, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. Understanding wind turbine wake recovery is important for developing models of wind turbine interaction employed in the design of energy-efficient wind farm layouts. Wake recovery is often assumed or explained to be a shear-driven process; however, this is generally not accurate. In this work we show that wind turbine wakes recover mainly due to the divergence (lateral and vertical gradients) of Reynolds shear stresses, which transport momentum from the freestream towards the wake center. The wake recovery mechanisms are illustrated using a simple analytic model and results of large-eddy simulation.

Maarten Paul van der Laan et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2022-56', Anonymous Referee #1, 03 Aug 2022
  • RC2: 'Comment on wes-2022-56', Anonymous Referee #2, 13 Oct 2022

Maarten Paul van der Laan et al.

Maarten Paul van der Laan et al.

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Short summary
Understanding wind turbine wake recovery is important to mitigate energy losses in wind farms. Wake recovery is often assumed or explained to be dependent on the first order derivative of velocity. In this work we show that wind turbine wakes recover mainly due to the second order derivative of the velocity, which transport momentum from the freestream towards the wake center. The wake recovery mechanisms are illustrated using a simple model and results of a high fidelity numerical simulation.