Preprints
https://doi.org/10.5194/wes-2024-60
https://doi.org/10.5194/wes-2024-60
27 May 2024
 | 27 May 2024
Status: this preprint is currently under review for the journal WES.

Velocity correction for the Actuator Line Method

Davide Selvatici and Richard J. A. M. Stevens

Abstract. We introduce a velocity correction designed to mitigate the overestimation of aerodynamic loads observed with the traditional Actuator Line Method (ALM) at the blades tip. The correction is based on Blade Element Momentum (BEM) theory to determine the ratio of tip-corrected to non-tip-corrected axial and tangential velocity components. These velocity ratios are used to correct the velocities at the blade locations, ensuring an accurate representation of aerodynamic effects near the blade tips. The correction only requires the Tip Speed Ratio (TSR), which can be estimated from local flow conditions and turbine specifications. This makes the method highly adaptable to various flow scenarios. The effectiveness of the proposed correction has been validated through Large Eddy Simulations (LES) at multiple inflow velocities through comparison against both BEM with tip correction and a vortex-based smearing correction for ALM.

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Davide Selvatici and Richard J. A. M. Stevens

Status: open (until 29 Jun 2024)

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  • RC1: 'Comment on wes-2024-60', Anonymous Referee #1, 21 Jun 2024 reply
Davide Selvatici and Richard J. A. M. Stevens
Davide Selvatici and Richard J. A. M. Stevens

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Short summary
The Actuator Line Method is to date one of the most adopted models for wind turbines in numerical simulations, yet it is known to overestimate the loading at the blade tips. We developed an extremely efficient correction methodology that is able to retrieve the loading distribution of Blade Element Method with tip correction independently on the turbine adopted, or on the chosen inflow velocity, making it possible to be used for simulations of wind farms.
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