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Boorsma, K. (author), Schepers, J.G. (author), Madsen, H.A. (author), Pirrung, G. (author), Sorensen, N. (author), Bangga, G. (author), Imiela, M. (author), Grinderslev, C. (author), Forsting, A.M. (author), Shen, W.Z. (author), Croce, A. (author), Cacciola, S. (author), Schafferczyk, A.P. (author), Lobo, B. (author), Blondel, F. (author), Gilbert, P. (author), Boisard, R. (author), Honing, L. (author), Greco, L. (author), Testa, C. (author), Branlard, E. (author), Jonkman, J. (author), Vijayakumar, G. (author)Within the framework of the fourth phase of the International Energy Agency (IEA) Wind Task 29, a large comparison exercise between measurements and aeroelastic simulations has been carried out featuring three simulation cases in axial, sheared and yawed inflow conditions. Results were obtained from more than 19 simulation tools originating from...article 2023
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Mancini, S. (author), Boorsma, K. (author), Schepers, J.G. (author), Savenije, F.J. (author)With the increase in rotor sizes, the implementation of innovative pitch control strategies, and the first floating solutions entering the market, the importance of unsteady aerodynamic phenomena in the operation of modern offshore wind turbines has increased significantly. Including aerodynamic unsteadiness in blade element momentum (BEM)...article 2023
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Langidis, A. (author), Petrovic, V. (author), Mancini, S. (author), Boorsma, K. (author), Schepers, J.G. (author), Kühn, M. (author)Dynamic inflow effects occur due to the rapid change of the rotor loading under conditions such as fast pitch steps. The paper presents a setup suitable for the investigation of those effects for non-axisymmetric rotor conditions, namely individual pitch steps. Furthermore, insights into the relevant phenomena are gathered. An individual pitch...conference paper 2023
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Mancini, S. (author), Boorsma, K. (author), Schepers, J.G. (author), Savenije, F.J. (author)With the increase in rotor sizes, the implementation of innovative pitch control strategies, and the first floating solutions entering the market, the importance of unsteady aerodynamic phenomena in the operation of modern offshore wind turbines has increased significantly. Including aerodynamic unsteadiness in Blade Element Momentum (BEM)...article 2022
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Mancini, S. (author), Boorsma, K. (author), Caboni, M. (author), Hermans, K.W. (author), Savenije, F.J. (author)The design of next-generation offshore wind rotors for floating applications carries large uncertainties that make it harder to bring costs down. A significant share of this uncertainty is associated with the use of Blade Element Momentum (BEM) methods to run aeroelastic design and loadcase calculations, because the assumptions underlying the...conference paper 2022
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- Boorsma, K. (author), Savenije, F.J. (author), Mancini, S. (author) public lecture 2022
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Sanderse, B. (author), Dighe, V.V. (author), Boorsma, K. (author), Schepers, J.G. (author)This paper presents an efficient strategy for the Bayesian calibration of parameters of aerodynamic wind turbine models. The strategy relies on constructing a surrogate model (based on adaptive polynomial chaos expansions), which is used to perform both parameter selection using global sensitivity analysis and parameter calibration with Bayesian...article 2022
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Mancini, S. (author), Boorsma, K. (author)As part of the TNO activities within the TipTOP project (Tip design To OPtimize wind turbine blade aeroelasticity), the state-of-the-art in-house developed aerodynamic solver AeroModule has been coupled to OpenFAST to create a new powerful tool for the aeroelastic modelling of modern wind turbines. This tool combines the aero dynamic accuracy...report 2022
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Boorsma, K. (author)To investigate the effects of rotation without the complicating effect of unknown stochastic inflow, wind tunnels have been used for 3D rotating measurements despite their size limitations. Several examples of past experiments and their lessons learned are given, illustrating the challenges with respect to scaling and measurement instrumentation...bookPart 2022
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Boorsma, K. (author)Wind tunnels have been used extensively by the wind energy community to measure 2D airfoil performance (the subject of 2d Airfoil Measurements). However, despite their size limitations, wind tunnels have also been used for 3D rotating measurements. This allows to investigate the effects of rotation without the com plicating effect of the unknown...bookPart 2021
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- Fritz, E.C. (author), Ferreira, C. (author), Boorsma, K. (author) article 2021
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Boorsma, K. (author), Wenz, F. (author), Lindenberg, K. (author), Aman, M. (author), Kloosterman, M. (author)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...article 2020
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Boorsma, K. (author), Caboni, M. (author)This report deals with a numerical investigation of the unsteady aerodynamics of a floating horizontal axis offshore wind turbine and its validation against dedicated wind tunnel experiments. In the underlying UNAFLOW project, both threedimensional and two­dimensional wind tunnel tests were conducted respectively on the rotating rotor and...report 2020
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Wenz, F. (author), Boorsma, K. (author), Lutz, T. (author), Kramer, E. (author)In cases with turbulent inflow, the analysis of the temporal development of forces could provide more insight into differences in calculated fatigue loads of wind turbines. While lifting-line-codes and the Blade-Element-Momentum (BEM) approach do not resolve the inflow, Computational Fluid-Dynamic (CFD) codes resolve the entire flow field. A...article 2020
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Caboni, M. (author), Carrion, M. (author), Rodriquez, C. (author), Schepers, J.G. (author), Boorsma, K. (author), Sanderse, B. (author)The general goal of the work reported in this paper is to gain more confidence when performing blade element momentum (BEM)-based aeroelastic simulations, especially when setting-up sub-models and their parameters. Due to limited or no information, the set-up of these methods is often highly uncertain. To achieve this objective, we have...conference paper 2020
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Mancini, S. (author), Boorsma, K. (author), Caboni, M. (author), Curmier, M. (author), Lutz, T. (author), Schito, P. (author), Zasso, A. (author)The disruptive potential of floating wind turbines has attracted the interest of both the industry and the scientific community. Lacking a rigid foundation, such machines are subject to large displacements whose impact on aerodynamic performance is not yet fully explored. In this work, the unsteady aerodynamic response to harmonic-surge motion...article 2020
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Kumar, P. (author), Sanderse, B. (author), Boorsma, K. (author), Caboni, M. (author)A framework is presented for performing global sensitivity analysis of model parameters associated with the Blade Element Momentum (BEM) models. Sobol indices based on adaptive sparse polynomial expansions are used as a measure of global sensitivities. The sensitivity analysis workflow is developed using the uncertainty quantification toolbox...conference paper 2020
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Hur, C. (author), Berdowski, T. (author), Ferreira, C. (author), Schepers, G. (author), Boorsma, K. (author)BEM (Bladed Element Momentum) models have shown to be inaccurate in predicting loads in the case of yawed flow [1-3]. Actuator disk momentum theory is the basis for BEM codes, following Glauert's auto-gyro theory [4]. Therefore, a first step to improve BEM in yawed flow is to assess momentum models for the actuator disk in yaw and investigate...conference paper 2019
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Boorsma, K. (author), Aman, M. (author), Lindenberg, C. (author), Kloosterman, M. (author)Within the framework of the TKI WoZ VortexLoads, improvements to both BEM and free vortex wake codes have successfully been implemented with the end goal to make wind turbine design load calculations more accurate. Here we can distinguish improvements to BEM type codes, which focus on engineering models and their implementation to make these...report 2019
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Boorsma, K. (author), Wenz, F. (author), Aman, M. (author), Lindenburg, C. (author), Kloosterman, M. (author)Within the framework of the TKI WoZ VortexLoads project, CFD simulations were carried out to verify the earlier observed differences in dynamic loading and the resultant fatigue equivalents between BEM and vortex wake codes in turbulent inflow. Hereto a ’numerical’ wind tunnel was set-up subjecting a rigid (or non-flexible) version of the AVATAR...report 2019