Extension of the Non-Linear Harmonic method for the study of the dynamic aeroelasticity of horizontal axis wind turbines

Horcas, Sergio González; Debrabandere, François; Tartinville, B.; Hirsch, Charles; Coussement, Grégory

doi:10.1016/j.jfluidstructs.2017.06.008

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…In the aeromechanical analysis of turbomachines, relatively small amplitudes are typically used. However, previous studies suggest that the deflection of the blade can be up to 9% of the blade span [30]. Therefore, a relatively large amplitude of 9% of the span is used in this study.…”

Section: Aeromechanical Analysis Of the Mexico-experiments Wind Turbinementioning

confidence: 99%

“…It is found that a fully coupled multiple blade row model yields better accuracy in predicting flutter behaviour of the turbomachines than the simplified isolated one [28]. Although frequency domain methods are typically used for the aeromechanical analysis of turbomachinery applications, only a few studies recently applied these methods to wind turbine applications [29][30][31][32][33][34]. This has motivated the authors to seek an efficient numerical method employing a frequency domain method for the aerodynamic and aeroelasticity simulations of wind turbines at an affordable computational cost without compromising accuracy in predicting unsteady flows.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines

2021

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The aerodynamic simulations of wind turbines are typically carried out using a steady inflow condition. However, the aerodynamics and aeroelasticity of wind turbine blades can be significantly affected by inflow wakes due to the environmental conditions or the presence of neighbouring wind turbines. In this paper, the effects of flow unsteadiness on the aerodynamics and aeroelasticity of the wind turbine rotor are investigated. It is found that the unsteadiness of the wake can have an impact on the aerodynamic flow field around the wind turbine rotor and it could also influence the aeroelasticity of the wind turbine. One of the distinctive features of this paper is the application of the highly efficient nonlinear frequency domain solution method for modelling harmonic disturbances for the aerodynamic and aeromechanical analysis of wind turbines. A test case wind turbine is selected for the aerodynamic and aeromechanical analysis as well as for the validation of the method used. The effects of different material properties along with a large vibration amplitude on the aeroelasticity parameter known as aerodynamic damping of the wind turbine blade are also investigated in the present work. Compared to the conventional time domain solution methods, which require prohibitively large computational cost for modelling and solving aerodynamics and aeroelasticity of wind turbines, the proposed frequency domain solution method can reduce the computational cost by one to two orders of magnitude.

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Section: Aeromechanical Analysis Of the Mexico-experiments Wind Turbinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines

2021

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“…The flow inlet and outlet are located 2R upstream of the rotor and 4R downstream of the rotor, respectively, and the far-field boundary is placed 3R from the origin of coordinates, where R is the rotor radius. There are studies in the literature which used similar domain sizes and showed that they can accurately predict the blade loading and flow behaviour [12,26,38]. Therefore, it can be noted that the considered distances for far-field boundaries are sufficiently far away from the turbine.…”

Section: Computational Domain and Gridmentioning

confidence: 99%

Aeromechanical Analysis of a Complete Wind Turbine Using Nonlinear Frequency Domain Solution Method

Naung

Rahmati

Farokhi

2021

Journal of Engineering for Gas Turbines and Power

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The high-fidelity computational fluid dynamics (CFD) simulations of a complete wind turbine model usually require significant computational resources. It will require much more resources if the fluid-structure interactions between the blade and the flow are considered, and it has been the major challenge in the industry. The aeromechanical analysis of a complete wind turbine model using a high-fidelity CFD method is discussed in this paper. The distinctiveness of this paper is the application of the nonlinear frequency domain solution method to analyse the forced response and flutter instability of the blade as well as to investigate the unsteady flow field across the wind turbine rotor and the tower. This method also enables the aeromechanical simulations of wind turbines for various inter blade phase angles in a combination with a phase shift solution method. Extensive validations of the nonlinear frequency domain solution method against the conventional time domain solution method reveal that the proposed frequency domain solution method can reduce the computational cost by one to two orders of magnitude.

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“…11 It has been further improved to include unsteady uid loads in the structural deformation. 12,13 The structural ROM that has been retained for the present study is the Oofelie R Computational Structure Mechanics solver. It is a general purpose nite element software for structural and heat transfer analysis.…”

Section: Linear Beam Model With Rans-based Aerodynamicsmentioning

confidence: 99%

Uncertainty Quantification of Aeroelastic Systems with Structural or Aerodynamic Nonlinearities

Cook

Wales

Gaitonde

et al. 2018

2018 Applied Aerodynamics Conference

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In this work, various aeroelastic approaches are used in the uncertainty quantication of a generic UAV wing. The dierent methods that are employed investigate varying levels of model delity, representing methods that could be used for low-order, rst-case studies, up to much higher delity methodologies. Results consider geometrically-exact structural and aerodynamic nonlinearities, and investigates the validity of using low-order simulations to predict deterministic and uncertainty bounds versus those of higher-order approaches. It is shown how correlated loads envelopes comparing strip theory aerodynamics show good agreement with higher order panel methods, even for very exible wings, but it is also seen how dierences in aerodynamic modelling (which would be equivalent in a structurally linear analysis) can eect the results, particularly torque. It is also shown how aerodynamic delity can potentially aect the uncertainty bounds of the computed aerodynamic loads, suggesting that low-order potential ow solvers signicantly underestimate the uncertainty bounds compared to higher-order RANS approaches.

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Extension of the Non-Linear Harmonic method for the study of the dynamic aeroelasticity of horizontal axis wind turbines

Cited by 12 publications

References 25 publications

Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines

Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines

Aeromechanical Analysis of a Complete Wind Turbine Using Nonlinear Frequency Domain Solution Method

Uncertainty Quantification of Aeroelastic Systems with Structural or Aerodynamic Nonlinearities

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