Latest results from the EU project AVATAR: Aerodynamic modelling of 10 MW wind turbines

Schepers, J.G.; Boorsma, K.; Sørensen, Niels N.; Voutsinas,; Sieros, Giorgos; Rahimi, H.; Heisselmann, Hendrik; Jost, Eva; Lutz, Thorsten; Maeder, Thomas; González, Ana Marta; Ferreira, Carlos; Stoevesandt, Bernhard; Barakos, George N.; Lampropoulos, N. K.; Croce, Alessandro; Madsen, Jesper

doi:10.1088/1742-6596/753/2/022017

Cited by 11 publications

(9 citation statements)

References 1 publication

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“…CFD simulations are carried out to verify the differences in dynamic loading and the resultant fatigue equivalents between BEM and vortex wake codes. The AVATAR 10 MW wind turbine model that originated from the AVATAR project (Schepers, 2016) was the subject of this study. With a rotor diameter of 205.8 m this turbine features a relatively low power density of around 300 W m −2 , operating at a design axial-induction factor of around 0.2.…”

Section: Verification Against Cfd Simulationsmentioning

confidence: 99%

“…The vortex wake models in this research are all low-order vortex filament methods. As part of the EU project AVATAR (Schepers, 2016) a fatigue load comparison round was performed between various aeroelastic codes using BEM and vortex wake models. Calculations were done featuring the AVATAR 10 MW rotor in turbulent inflow for a variety of time-averaged wind speeds.…”

Section: Introductionmentioning

confidence: 99%

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Validation and accommodation of vortex wake codes for wind turbine design load calculations

Boorsma

Wenz

Lindenburg³

et al. 2020

Wind Energ. Sci.

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Abstract. The computational effort for wind turbine design load calculations is more extreme than it is for other applications (e.g., aerospace), which necessitates the use of efficient but low-fidelity models. Traditionally the blade element momentum (BEM) method is used to resolve the rotor aerodynamic loads for this purpose, as this method is fast and robust. With the current trend of increasing rotor size, and consequently large and flexible blades, a need has risen for a more accurate prediction of rotor aerodynamics. Previous work has demonstrated large improvement potential in terms of fatigue load predictions using vortex wake models together with a manageable penalty in computational effort. The present publication has contributed towards making vortex wake models ready for application to certification load calculations. The observed reduction in flapwise blade root moment fatigue loading using vortex wake models instead of the blade element momentum (BEM) method from previous publications has been verified using computational fluid dynamics (CFD) simulations. A validation effort against a long-term field measurement campaign featuring 2.5 MW turbines has also confirmed the improved prediction of unsteady load characteristics by vortex wake models against BEM-based models in terms of fatigue loading. New light has been shed on the cause for the observed differences and several model improvements have been developed, both to reduce the computational effort of vortex wake simulations and to make BEM models more accurate. Scoping analyses for an entire fatigue load set have revealed the overall fatigue reduction may be up to 5 % for the AVATAR 10 MW rotor using a vortex wake rather than a BEM-based code.

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Section: Verification Against Cfd Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Boorsma

Wenz

Lindenburg³

et al. 2020

Wind Energ. Sci.

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“…However, due to the empirical nature of most engineering models, which are often based on findings obtained by rather small experimental wind turbines [12], their validity for the modeling of large rotors is currently under discussion [13,1,10,11]. In the wind turbine research community, there is a continuous effort for improving engineering add-ons in BEM.…”

Section: Introductionmentioning

confidence: 99%

“…In the wind turbine research community, there is a continuous effort for improving engineering add-ons in BEM. An example is the EU project AVATAR [14], which aims at improving and validating aerodynamic models, and to ensure their applicability for designing 10MW+ turbines [13]. One could think of improving the accuracy of these correction models for the BEM codes from measurements using hot wires or Particle Image Velocimetry (PIV) [15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

et al. 2018

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This work presents an investigation on different methods for the calculation of the angle of attack and the underlying induced velocity on wind turbine blades using data obtained from three-dimensional Computational Fluid Dynamics (CFD). Several methods are examined and their advantages, as well as shortcomings, are presented. The investigations are performed for two 10MW reference wind turbines under axial inflow conditions, namely the turbines designed in the EU AVATAR and INNWIND.EU projects. The results show that the evaluated methods are in good agreement with each other at the mid-span, though some deviations are observed at the root and tip regions of the blades. This indicates that CFD results can be used for the calibration of induction modeling for Blade Element Momentum (BEM) tools. Moreover, using any of the proposed methods, it is possible to obtain airfoil characteristics for lift and drag coefficients as a function of the angle of attack. Nomenclature ρ Air density [kg m −3 ] Γ Circulation [m 2 s −1 ]

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“…For the technical realization, an existing interface that was developed to couple SIMPACK with the fluid solver ANSYS CFX for the investigation of a tidal current turbine (Arnold et al, 2013) is extended. Furthermore, libraries for grid deformation and load integration which have recently been developed and integrated into FLOWer (Schuff et al, 2014;Kranzinger et al, 2016) are extended for the coupling with SIMPACK. Without restrictions in functionality, the setup of the coupling is kept simple and the dependencies between MBS and CFD models are low.…”

Section: Fluid-structure Interactionmentioning

confidence: 99%

Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

et al. 2018

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Abstract. The low-frequency emissions from a generic 5 MW wind turbine are investigated numerically. In order to regard airborne noise and structure-borne noise simultaneously, a process chain is developed. It considers fluid–structure coupling (FSC) of a computational fluid dynamics (CFD) solver and a multi-body simulations (MBSs) solver as well as a Ffowcs-Williams–Hawkings (FW-H) acoustic solver. The approach is applied to a generic 5 MW turbine to get more insight into the sources and mechanisms of low-frequency emissions from wind turbines. For this purpose simulations with increasing complexity in terms of considered components in the CFD model, degrees of freedom in the structural model and inflow in the CFD model are conducted. Consistent with the literature, it is found that aeroacoustic low-frequency emission is dominated by the blade-passing frequency harmonics. In the spectra of the tower base loads, which excite seismic emission, the structural eigenfrequencies become more prominent with increasing complexity of the model. The main source of low-frequency aeroacoustic emissions is the blade–tower interaction, and the contribution of the tower as an acoustic emitter is stronger than the contribution of the rotor. Aerodynamic tower loads also significantly contribute to the external excitation acting on the structure of the wind turbine.

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Latest results from the EU project AVATAR: Aerodynamic modelling of 10 MW wind turbines

Cited by 11 publications

References 1 publication

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

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