An engineering modification to the blade element momentum method for floating wind turbines

Mancini, Simone; Boorsma, K.; Caboni, Marco; Hermans, Koen; Savenije, Feike

doi:10.1088/1742-6596/2265/4/042017

Cited by 4 publications

(1 citation statement)

References 20 publications

(29 reference statements)

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“…The FVW simulations also showed a slight dependency of the mean power on the wave-induced motions, which was not the case in the BEMT simulations. In addition, simulations by Mancini et al [16] showed that the amplitude of power and thrust of a model rotor undergoing an exemplary periodic surge motion calculated by a BEMT method is smaller in comparison to the lifting-line FVW method AWSM [17]. Based on this observation, Mancini et al presented a new correction model for BEMT methods, which showed better agreement in the presented case.…”

Section: Previous Work On Wind Turbine Rotors In Surge Motionmentioning

confidence: 85%

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

Schulz,

Özinan,

Netzband

et al. 2023

J. Phys.: Conf. Ser.

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The role of unsteadiness in the aerodynamics of Floating Offshore Wind Turbines (FOWT) remains a subject of discussion among the research community. Therefore, it must be investigated whether and to what extent transient aerodynamic phenomena impact the loads of a wind turbine rotor undergoing motions in unsteady winds. The study of transient aerodynamic phenomena is closely linked to the question of whether the modern Blade Element Momentum Theory (BEMT) methods can be considered reliable for the simulation of FOWTs. In this work, investigations are carried out to identify the relevant transient aerodynamic phenomena and quantify their effects on the torque and thrust of the Floatgen wind turbine. A free-wake panel method is utilised to identify and quantify transient parts of the load response to a set of simplified unsteady scenarios: a wind gust, a harmonic surge motion and a rotor speed oscillation. Transient contributions to the load behaviour of the wind turbine can be identified in all scenarios under consideration. In addition, the ability of a state-of-the-art BEMT method to model the identified transient contributions is evaluated. While an agreement of the qualitative impact of the transient aerodynamic phenomena at moderate motion frequencies is found, a contradicting behaviour of the simulation models becomes apparent at high motion frequencies. This indicates the presence of a transient, three-dimensional wake effect that cannot be reproduced by the common unsteady corrections for BEMT methods.

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Section: Previous Work On Wind Turbine Rotors In Surge Motionmentioning

confidence: 85%

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

Schulz,

Özinan,

Netzband

et al. 2023

J. Phys.: Conf. Ser.

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Nonlinear inviscid aerodynamics of a wind turbine rotor in surge, sway, and yaw motions using a free-wake panel method

2023

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Abstract. We investigate the aerodynamics of a surging, heaving, and yawing wind turbine with numerical simulations based on a free-wake panel method. We focus on the UNAFLOW (UNsteady Aerodynamics of FLOating Wind turbines) case: a surging wind turbine which was modeled experimentally and with various numerical methods. Good agreement with experimental data is observed for amplitude and phase of the thrust with surge motion. We achieve numerical results of a wind turbine wake that accurately reproduce experimentally verified effects of surging motion. We then extend our simulations beyond the frequency range of the UNAFLOW experiments and reach results that do not follow a quasi-steady response for surge. Finally, simulations are done with the turbine in yaw and heave motion, and the impact of the wake motion on the blade thrust is examined. Our work seeks to contribute a different method to the pool of results for the UNAFLOW case while extending the analysis to conditions that have not been simulated before and providing insights into nonlinear aerodynamic effects of wind turbine motion.

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Going beyond BEM with BEM: an insight into dynamic inflow effects on floating wind turbines

Papi,

Jonkman,

Robertson

et al. 2024

Wind Energ. Sci.

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Abstract. Blade element momentum (BEM) theory is the backbone of many industry-standard wind turbine aerodynamic models. To be applied to a broader set of engineering problems, BEM models have been extended since their inception and now include several empirical corrections. These models have benefitted from decades of development and refinement and have been extensively used and validated, proving their adequacy in predicting aerodynamic forces of horizontal-axis wind turbine rotors in most scenarios. However, the analysis of floating offshore wind turbines (FOWTs) introduces new sets of challenges, especially if new-generation large and flexible machines are considered. In fact, due to the combined action of wind and waves and their interaction with the turbine structure and control system, these machines are subject to unsteady motion and thus unsteady inflow on the wind turbine's blades, which could put BEM models to the test. Consensus has not been reached on the accuracy limits of BEM in these conditions. This study contributes to the ongoing research on the topic by systematically comparing four different aerodynamic models, ranging from BEM to computational fluid dynamics, in an attempt to shed light on the unsteady aerodynamic phenomena that are at stake in FOWTs and whether BEM is able to model them appropriately. Simulations are performed on the UNAFLOW 1:75 scale rotor during imposed harmonic surge and pitch motion. Experimental results are available for these conditions and are used for baseline validation. The rotor is analyzed in both rated operating conditions and low wind speeds, where unsteady aerodynamic effects are expected to be more pronounced. Results show that BEM, despite its simplicity, can adequately model the aerodynamics of FOWTs in most conditions if augmented with a dynamic inflow model.

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An engineering modification to the blade element momentum method for floating wind turbines

Cited by 4 publications

References 20 publications

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

Nonlinear inviscid aerodynamics of a wind turbine rotor in surge, sway, and yaw motions using a free-wake panel method

Going beyond BEM with BEM: an insight into dynamic inflow effects on floating wind turbines

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