10 May 2023
 | 10 May 2023
Status: this preprint is currently under review for the journal WES.

Field data based validation of an aero-servo-elastic solver for high-fidelity LES of industrial wind turbines

Etienne Muller, Simone Gremmo, Félix Houtin-Mongrolle, Bastien Duboc, and Pierre Bénard

Abstract. To design the next generations of wind turbines, engineers from the wind energy industry must now have access to new numerical tools, allowing the high-fidelity simulation of complex physical phenomena and thus a further calibration of lower-order models. For instance, the rotors of offshore wind turbines, whose diameter can now exceed 200 m, are highly flexible and fluid-structure interactions cannot be neglected any longer. Accordingly, this paper presents a new aero-servo-elastic solver designed to perform high fidelity Large-Eddy Simulations (LES) of wind turbines, as well as of rotor-wake interactions classically occurring in wind farms. In this framework, the turbine blades are modeled as flexible actuator lines. In terms of operating parameters (rotation speed and pitch angles) and power output, the solver is first validated against field data from the Westermost Rough offshore wind farm, for three different operation points. A very good agreement between the numerical results and field data is obtained. To push the validation further, additional results are compared to those given by a certified aero-servo-elastic solver used in the industry, which relies on a Blade Element Momentum (BEM) method. The internal loads throughout the first blade and the deflections at the tip are studied in detail and some discrepancies are observed. Of a reasonable amplitude overall, those are legitimately related to intrinsic modeling differences between the two solvers.

Etienne Muller et al.

Status: open (until 20 Jun 2023)

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Etienne Muller et al.

Etienne Muller et al.


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Short summary
This article presents an advanced tool designed for the high-fidelity and high-performance simulation of operating wind turbines, allowing for instance to compute a blade deformation, as well as of the surrounding airflow. As this tool relies on coupling two existing codes, the coupling strategy is first described in depth. The article then presents the verification of the coupled code on simplified configurations. Finally, the code results are compared to field data for validation purposes.