04 Feb 2022
04 Feb 2022
Status: this preprint is currently under review for the journal WES.

Large-eddy Simulation of a Wind-turbine Array subjected to Active Yaw Control

Mou Lin and Fernando Porté-Agel Mou Lin and Fernando Porté-Agel
  • Wind Engineering and Renewable Energy Laboratory (WIRE), École Polytechnique Fédérale de Lausanne (EPFL), EPFL-ENAC-IIE-WIRE, CH-1015 Lausanne, Switzerland

Abstract. This study validates the large-eddy simulation (LES) technique for the prediction of the flow through a wind turbine array subjected to active yaw control. The wind turbine array consists of three miniature wind turbines operated in both non-yawed and yawed configurations under full-wake and partial-wake conditions, for which wind tunnel flow measurements are available. The turbine-induced forces are parametrised by three different models: the standard actuator disk model (ADM-std), the blade element actuator disk model (ADM-BE), also referred to as the rotational actuator disk model (ADM-R), and the actuator line model (ALM). The time-averaged turbine power outputs and the profiles of the wake flow statistics (normalised streamwise mean velocity and streamwise turbulence intensity) obtained from the simulations using the ADM-std, the ADM-BE and the ALM are compared with experimental results. We find that simulations using the ADM-BE and ALM yield flow statistics that are in good agreement with the wind-tunnel measurements for all the studied configurations. In contrast, the results from LES with the ADM-std show discrepancies with the measurements under yawed and/or partial-wake conditions. These errors are due to the fact that the ADM-std assumes a uniform thrust force, thus failing to capture the inherently non-uniform distribution of the turbine-induced forces under partial wake conditions. In terms of power prediction, we find that LES using the ADM-BE yields better power prediction than the ADM-std and the ALM in both non-yawed and yawed conditions. As a result, we conclude that LES using the ADM-BE provides a good balance of accuracy and computational cost for simulations of the flow through wind farms subjected to AYC.

Mou Lin and Fernando Porté-Agel

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-2022-10', Luis Martinez, 22 Mar 2022
  • RC2: 'Comment on wes-2022-10', Anonymous Referee #2, 02 May 2022

Mou Lin and Fernando Porté-Agel

Mou Lin and Fernando Porté-Agel


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Short summary
Large-eddy simulation (LES) is a widely used method to study wind turbine flow. To save computational resource, the turbine-inducing forces in LES are often modeled by parametrisations. We validate three widely used turbine parametrisations in LES in different yaw and offset configuration with wind tunnel measurements, and we find that, in comparison with other parametrisations, the blade element actuator disk model strike a good balance of accuracy and computational cost.