IEA Wind TCP Task 29, Phase IV: Detailed Aerodynamics of Wind Turbines

Schepers, J.G.; Boorsma, K.; Madsen, H.A; Pirrung, Georg Raimund; Bangga, Galih; Guma, Giorgia; Lutz, Th.; Potentier, Thomas; Braud, Caroline; Guilmineau, Emmanuel; Croce, A.; Cacciola, S.; Schaffarczyk, A. P.; Lobo, Brandon Arthur; Ivanell, Stefan; Asmuth, Henrik; Bertagnolio, Franck; Sørensen, Niels N.; Shen, Wenzhong; Grinderslev, Christian; Forsting, A. M.; Blondel, Frédéric; Bozonnet, Pauline; Boisard, R.; Yassin, K.; Hoening, L.; Stoevesandt, Bernhard; Imiela, Manfred; Greco, L.; Testa, Claudio; Magionesi, F.; Vijayakumar, G.; Ananthan, S.; Sprague, M. A.; Branlard, E.; Jonkman, J.; Carrion, Marina; Parkinson, Stephen T.; Cicirello, E.

doi:10.5281/zenodo.4813068

Cited by 4 publications

(3 citation statements)

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“…This factor is based on the grid line normal distance to the surface and ensures that mesh cells close to the surface are moved as rigid cells, while further from the surface the cells are deformed based on the distance. The solver has been extensively used and validated through multiple studies of wind turbines; see for instance the Mexico project (Bechmann et al, 2011;Sørensen et al, 2016), the Phase VI NREL rotor simulations (Sørensen and Schreck, 2014;Sørensen et al, 2002), and recent comparisons with wind tunnel tests of a curved blade tip (Barlas et al, 2021) and with the full scale DanAero measurements (Madsen et al, 2018;Grinderslev et al, 2020b;Schepers et al, 2021).…”

Section: Flow Solvermentioning

confidence: 99%

Multiple limit cycle amplitudes in high fidelity predictions of standstill wind turbine blade vibrations

Grinderslev

Sørensen

Pirrung

et al. 2022

Preprint

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Abstract. In this study, vortex induced vibrations (VIVs) on the IEA10MW blade are investigated using two methodologies in order to assess strengths and weaknesses of the two simulation types. Both fully coupled fluid-structure interaction (FSI) simulations and computational fluid dynamics (CFD) with forced motion of the blade are used and compared. It is found that for the studied cases with high inclination angles, the forced motion simulations succeed in capturing the power injection by the aerodynamics, despite the motion being simplified. From the fully coupled simulations, a dependency of initial conditions of the vibrations was found, showing that cases which are stable if unperturbed, might go into large VIVs if provoked initially by for instance inflow turbulence or turbine operations. Depending on the initial vibration amplitudes, multiple limit cycle levels can be triggered, for the same flow case, due to the non-linearity of the aerodynamics. By fitting a simple damping model for the specific blade and mode shape from FSI simulations, it is also demonstrated that the equilibrium limit cycle amplitudes between power injection and dissipation can be estimated using forced motion simulations, even for the multiple stable vibration cases, with good agreement to fully coupled simulations. Finally, a time series generation from forced motion simulations and the simple damping model is presented, concluding that CFD amplitude sweeps can estimate not only the final limit cycle oscillation amplitude, but also the vibration build-up time series.

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Section: Flow Solvermentioning

confidence: 99%

Multiple limit cycle amplitudes in high fidelity predictions of standstill wind turbine blade vibrations

Grinderslev

Sørensen

Pirrung

et al. 2022

Preprint

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show abstract

“…Here, measurement data from field tests and wind tunnels are used to validate the model predictions. This has been an ongoing effort for decades [2,3,4,5,6,7,8]. Although the use of high-fidelity computation fluid dynamics (CFD) and mid-fidelity free-vortex wake (FVW) models has become commonplace within the wind energy community, they still fail to meet the requirements in terms of execution time and computational cost needed for design load calculations.…”

Section: Introductionmentioning

confidence: 99%

Challenges in Rotor Aerodynamic Modeling for Non-Uniform Inflow Conditions

Boorsma,

Schepers,

Pirrung

et al. 2024

J. Phys.: Conf. Ser.

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Within an international collaboration framework, the accuracy of rotor aerodynamic models used for design load calculations of wind turbines is being assessed. Where the use of high-fidelity computation fluid dynamics (CFD) and mid-fidelity free-vortex wake (FVW) models has become commonplace within the wind energy community, these still fail to meet the requirements in terms of execution time and computational cost needed for design load calculations. The fast but engineering fidelity blade-element/momentum (BEM) method can therefore still be considered the industry workhorse for design load simulations. At the same time, upscaling of wind turbine rotors makes inflow non-uniformities (e.g. shear, veer, turbulence) more important. The objective of this work is to assess model accuracy in non-uniform inflow conditions, which violate several BEM assumptions. Thereto a comparison in turbulent inflow has been executed including a wide variety of codes, focusing on the DanAero field measurements, where a 2.3-MW turbine was equipped with, among other sensors, a pressure measurement apparatus. The results indicate that, although average load patterns are in good agreement, this does not hold for the unsteady loads that drive fatigue damage and aero-elastic stability. A simplified comparison round in vertical shear was initiated to investigate the observed differences in a more controlled manner. A consistent offset in load amplitude was observed between CFD and free-vortex codes on the one hand and BEM-type codes on the other hand. To shed more light on the observations, dedicated efforts are ongoing to pinpoint the cause for these differences, in the end leading to guidelines for an improved BEM implementation.

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“…Wind turbines are exposed to inflow turbulences of different scales due to the atmosphere in which they operate (see e.g. Schepers et al (2021)) and also to rotor misalignment with the inflow or wakes of neighboring turbines. This is even more significant for offshore wind turbines whose rotor diameter are significantly larger, with local shear inflow over the rotor sweep area and even along the blades.…”

Section: Introductionmentioning

confidence: 99%

Some comments on experimental results of three lift controllers for a wind turbine blade section using an active flow control

Michel,

Braud,

Barbot

et al. 2024

Preprint

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Abstract. Controlling wind turbines is generally performed globally (rotor yaw or blade pitch control) to optimize the energy extraction and minimize rotor's loads for rotor's lifetime extension. This means that no information from the blade aerodynamics is up to now taken into account in the control loop while it is well understood that wind inflow interaction with blade aerodynamics can lead to power loss, load fluctuations and noise generation. This work deals with the development of control algorithms applied at the level of the blade section, considering only local aerodynamic sensing and actuators. The objective is to extract the maximum power from the wind energy by maintaining the aerodynamic lift at its highest value, while limiting load fluctuations using different solutions of control which take into account disturbances from different turbulent inflows. Some control strategies are investigated thanks to an experimental bench in the aerodynamic wind tunnel of LHEEA's laboratory in order to compare the tracking performances with respect to different operating scenarios.

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IEA Wind TCP Task 29, Phase IV: Detailed Aerodynamics of Wind Turbines

Cited by 4 publications

References 0 publications

Multiple limit cycle amplitudes in high fidelity predictions of standstill wind turbine blade vibrations

Multiple limit cycle amplitudes in high fidelity predictions of standstill wind turbine blade vibrations

Challenges in Rotor Aerodynamic Modeling for Non-Uniform Inflow Conditions

Some comments on experimental results of three lift controllers for a wind turbine blade section using an active flow control

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