A flexible actuator curve model for aeroelastic simulations of wind turbines in atmospheric boundary layers

Trigaux, François; Chatelain, Philippe; Winckelmans, Grégoire

doi:10.1088/1742-6596/2265/2/022050

Cited by 8 publications

(12 citation statements)

References 22 publications

(28 reference statements)

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“…However, the standard deviation of the airloads along the blade in Figure 8 starts to unveil the differences in the data set. Although we were not able to provide a fair comparison for the same conditions as in the case of the time‐averaged airloads, we proved the validity of our data by checking them against the distributions of the standard deviation along the blade for similar cases in Ehrich et al 85 and in Trigeaux et al, 65 obtaining satisfactory results. The cases using the UA model exhibit a relevant increase in the airloads variability in the first half of the blade, whereas the cases with two‐way FSI coupling exhibit a slight reduction towards the tip, as shown in our previous works.…”

Section: Resultsmentioning

confidence: 60%

“…Similar to other works, 64,65 the simplified coupling procedure profits from the sectional 1D formulation of the ALM and avoids the complex fluid-solid interface treatment with the associated kinematic and traction conditions. 66 Moreover, the efficient coupling algorithm and structural solver are able to preserve the overall computational efficiency, already loaded with the considerable expense of the LES.…”

Section: Fsi Modelmentioning

confidence: 94%

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Large eddy simulations of a utility‐scale horizontal axis wind turbine including unsteady aerodynamics and fluid‐structure interaction modelling

2022

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Growing horizontal axis wind turbines are increasingly exposed to significant sources of unsteadiness, such as tower shadowing, yawed or waked conditions and environmental effects. Due to increased dimensions, the use of steady tabulated airfoil coefficients to determine the airloads along long blades can be questioned in those numerical fluid models that do not have the sufficient resolution to solve explicitly and dynamically the flow close to the blade. Various models exist to describe unsteady aerodynamics (UA). However, they have been mainly implemented in engineering models, which lack the complete capability of describing the unsteady and multiscale nature of wind energy. To improve the description of the blades' aerodynamic response, a 2D unsteady aerodynamics model is used in this work to estimate the airloads of the actuator line model in our fluid-structure interaction (FSI) solver, based on 3D large eddy simulation. At each section along the actuator lines, a semiempirical Beddoes-Leishman model includes the effects of noncirculatory terms, unsteady trailing edge separation, and dynamic stall in the dynamic evaluation of the airfoils' aerodynamic coefficients. The aeroelastic response of a utility-scale wind turbine under uniform, laminar and turbulent, sheared inflows is examined with oneand two-way FSI coupling between the blades' structural dynamics and local airloads, with and without the enhanced aerodynamics' description. The results show that the

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Section: Resultsmentioning

confidence: 60%

Section: Fsi Modelmentioning

confidence: 94%

Large eddy simulations of a utility‐scale horizontal axis wind turbine including unsteady aerodynamics and fluid‐structure interaction modelling

2022

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“…This leads to a better estimation of the aerodynamic loads, hence much decreasing the need for a tip correction, especially when slender blades are considered. A more detailed description of the used regularization is provided in Trigaux et al [25] and its advantages over a 3D distribution are detailed in Caprace et al.…”

Section: Actuator Line Methods (Alm)mentioning

confidence: 99%

Impact of the rotor blades elasticity on the loads and wake of the large IEA 15-MW wind turbine

Trigaux

Chatelain

Winckelmans

2023

J. Phys.: Conf. Ser.

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This work presents an investigation of the aeroelastic effects occurring on the IEA 15-MW reference wind turbine in a turbulent atmospheric boundary layer. Large Eddy simulation is carried out using an actuator line method coupled to the finite element beam solver BeamDyn. The results show that the blades experience significant displacements, leading to an important variation of the loads along the blade span. The turbulence also interacts with the blades natural frequencies, resulting in a variation of the spectra of the various loads. The impact of the flexibility is also evaluated on the wake by comparing the undeformed configuration with a statically and dynamically deformed rotor. It appears that the mean deformation plays an important role in the wake development due to changes in the load distribution, but that the dynamic effects have minimal impact on the wake behavior.

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“…The VPM code does not capture the aeroelastic effects of the wind turbine blades, those thus act as rigid bodies. Although the fourth‐order finite differences code has been extended and two‐way coupled to an aeroelastic code, 52 this feature is currently only available for the AL method.…”

Section: Methodsmentioning

confidence: 99%

“…and two-way coupled to an aeroelastic code, 52 this feature is currently only available for the AL method.…”

Section: Estimation Of the Fatigue Loadsmentioning

confidence: 99%

Assessment of an actuator disk‐based approach for the prediction of fatigue loads in a perspective of wind farm‐scale application

2022

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This work aims at assessing the loads and the fatigue estimates computed using an advanced actuator disk (AD) method coupled to large eddy simulation, at a resolution appropriate for large wind farm calculations. In order to compute pertinent fatigue loads, blade trajectories are replicated through the disk, and the AD aerodynamic forces are interpolated onto these "virtual blades" at each time step. This approach, denoted AD-B, is verified against a Vortex-Particle Mesh (VPM) method coupled to immersed lifting lines at a fine resolution, through simulations of an isolated rotor in a turbulent wind. Two different methods are used to evaluate the fatigue damages: the widely used Rainflow counting (RFC) procedure and the spectral Dirlik's approach (DK), both combined with a Palgrem-Miner rule. In the present work, the DK counting method is considered to further investigate the potential of extrapolating some loading data in the high frequencies, uncaptured by the AD-B model at a coarse resolution. The results show that the fatigue estimates computed using the RFC procedure are very similar for the VPM and the AD-B methods, thus without any modeling of the unresolved scales for the disk. Indeed, the AD-B model captures the loads of middle and large amplitudes that contribute the most to the rotor damage. The use of extrapolated loading data makes the AD-B fatigue estimates closer to the VPM ones, but the DK counting method globally leads to results that are quite different from those obtained using the RFC procedure. Further investigations are thus required for the combination of extrapolated loading information and spectral counting methods.

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A flexible actuator curve model for aeroelastic simulations of wind turbines in atmospheric boundary layers

Cited by 8 publications

References 22 publications

Large eddy simulations of a utility‐scale horizontal axis wind turbine including unsteady aerodynamics and fluid‐structure interaction modelling

Large eddy simulations of a utility‐scale horizontal axis wind turbine including unsteady aerodynamics and fluid‐structure interaction modelling

Impact of the rotor blades elasticity on the loads and wake of the large IEA 15-MW wind turbine

Assessment of an actuator disk‐based approach for the prediction of fatigue loads in a perspective of wind farm‐scale application

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