Preprints
https://doi.org/10.5194/wes-2023-109
https://doi.org/10.5194/wes-2023-109
06 Sep 2023
 | 06 Sep 2023
Status: a revised version of this preprint is currently under review for the journal WES.

Going Beyond BEM with BEM: an Insight into Dynamic Inflow Effects on Floating Wind Turbines

Francesco Papi, Jason Jonkman, Amy Robertson, and Alessandro Bianchini

Abstract. Blade Element Momentum (BEM) theory is the backbone of many industry-standard wind turbine aerodynamic models. To be applied to a broader set of engineering problems, BEM models have been extended since their inception and now include several empirical corrections. These models have benefitted from decades of development and refinement and have been extensively used and validated, proving their adequacy in predicting aerodynamic forces of horizontal axis wind turbine rotors in most scenarios. However, the analysis of Floating Offshore Wind Turbines (FOWTs) introduces new sets of challenges, especially if new-generation large and flexible machines are considered. In fact, due to the combined action of wind and waves and their interaction with the turbine structure and control system, these machines are subject to unsteady motion, and thus unsteady inflow on the wind turbine’s blades, which could put BEM models to the test. Consensus is not present yet on the accuracy limits of BEM in these conditions. This study contributes to the ongoing research on the topic by systematically comparing four different aerodynamic models, ranging from BEM to Computational Fluid Dynamics (CFD), in an attempt to shed light on the unsteady aerodynamic phenomena that are at stake in FOWTs and whether BEM is able to model them appropriately. Simulations are performed on the UNAFLOW 1:75 scale rotor during imposed harmonic surge and pitch motion. Experimental results are available for these conditions and are used for baseline validation. The rotor is analysed both in rated operating conditions and in low wind speeds, where unsteady aerodynamic effects are expected to be more pronounced. Results show how BEM, despite its simplicity, if augmented with a dynamic inflow model, is able to adequately model the aerodynamics of FOWTs in most conditions.

Francesco Papi, Jason Jonkman, Amy Robertson, and Alessandro Bianchini

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on wes-2023-109', Christian Schulz, 07 Sep 2023
    • AC1: 'Reply on CC1', Alessandro Bianchini, 07 Sep 2023
      • CC2: 'Reply on AC1', Christian Schulz, 07 Sep 2023
  • RC1: 'Comment on wes-2023-109', Anonymous Referee #1, 21 Nov 2023
    • AC2: 'Reply on RC1', Alessandro Bianchini, 11 Jan 2024
  • RC2: 'Comment on wes-2023-109', Martin Hansen, 08 Dec 2023
    • AC3: 'Reply on RC2', Alessandro Bianchini, 11 Jan 2024
Francesco Papi, Jason Jonkman, Amy Robertson, and Alessandro Bianchini
Francesco Papi, Jason Jonkman, Amy Robertson, and Alessandro Bianchini

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Short summary
Blade Element Momentum theory (BEM) is the backbone of many industry-standard aerodynamic models. However, the analysis of Floating Offshore Wind Turbines (FOWTs) introduces new challenges, which could put BEM models to the test. This study systematically compares four aerodynamic models, ranging from BEM to Computational Fluid Dynamics, in an attempt to shed light on the unsteady aerodynamic phenomena that are at stake in FOWTs and whether BEM is able to model them appropriately.
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