Comparison of the free vortex wake and actuator line methods to study the loads of a wind turbine in imposed surge motion

Corniglion, Rèmi; Harris, Jeffrey C.; Peyrard, Christophe; Capaldo, Matteo

doi:10.1088/1742-6596/1618/5/052045

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…Full details of the code can be found in Murray and Barone 12 . For computational efficiency, the GPU parallelization of CACTUS of Corniglion et al 27 is used. For all of the cases presented here, the FVW uses a desingularization core radius of 10 % of the local chord.…”

Section: Dynamics Study With Free Vortex Wake Modelmentioning

confidence: 99%

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

2022

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Floater motions introduce unsteadiness in the aerodynamics of floating offshore wind turbines. The aerodynamics of a wind turbine after three perturbations are studied: a blade pitch step, a rotor speed step for which dynamic inflow is expected, and a surge velocity step. The free vortex wake method and an analytical helical vortex model based on the Joukowsky rotor model are used to study the dynamic behavior of the induced velocity at the blades. As expected, the dynamic inflow effect is clear for the blade pitch and rotor speed changes, but for a surge velocity step, the models show that very little dynamic inflow effect takes place because the velocity induced by the vortex helix is not significantly modified: the tip vortex helix circulation change is partially compensated by the geometry change of the helix. For the rate of change, the velocities induced on the rotor by the vortex helix for the pitch and rotor speed changes show a rapid adjustment at the blade tip, with a slower change throughout the rest of the blade and at the center of the rotor.The convection velocity of the tip vortices is shown to be the main variable of the temporal evolution of the dynamic inflow effect.

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Section: Dynamics Study With Free Vortex Wake Modelmentioning

confidence: 99%

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

2022

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“…During the design and planning stages of new offshore wind turbines and wind farm development, simulation tools are used to predict the coupled dynamic loads and response of the offshore wind turbine structure 5 . Such tools are developing very quickly in recent years and vortex solvers have the potential to become a key method due to their flexibility and reliability 6–8 . With these solvers, it is possible to easily combine different flow and aerodynamic models depending on the degree of complexity required for the case of study.…”

Section: Introductionmentioning

confidence: 99%

“…5 Such tools are developing very quickly in recent years and vortex solvers have the potential to become a key method due to their flexibility and reliability. [6][7][8] With these solvers, it is possible to easily combine different flow and aerodynamic models depending on the degree of complexity required for the case of study. Enumerated in ascending complexity, the aerodynamic models traditionally implemented in the vortex solvers can be classified as Lifting Line (LL), vortex lattice, potential panel, viscous-inviscid panel, and penalization methods.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the floating IEA Wind 15 MW RWT using vortex methods Part I: Flow regimes and wake recovery

et al. 2021

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Floating wind turbines have the potential to enable global exploitation of offshore wind energy, but there is a need to further understand the complex aerodynamic phenomena they can encounter due to floater induced rotor motion. Aerodynamic models traditionally used in the wind energy sector, like the Blade Element Momentum (BEM) theory, may not be capable of capturing the dynamic phenomena that occur when the rotor moves in and out of its own wake. In the present paper, we therefore compare an industry standard BEM‐based code to a state of the art vortex solver, to investigate the phenomena in detail and further clarify the capabilities and limitations of both methods. An initial benchmark of the two codes using the IEA Wind 15 MW RWT mounted on the WindCrete spar‐buoy floater is carried out. Three different scenarios are taken into account: a bottom‐fixed, a floating case, and a floating case subject to regular waves. Growing discrepancies between the codes have been observed with the increasing complexity of the simulations. Moreover, large differences between the wake generated by a bottom fixed and a floating turbine have been observed, with the latter one experiencing a faster recovery. To further explore the floating turbines behaviors that can affect the rotor performance and wake, a systematic investigation of the mean tilt angle influence in the wake development has been carried out. Further, to account for the oscillatory motion of a floating turbine, a parametric study where the floater motion is prescribed in both pitch and surge degrees of freedom (DoF) is designed. The study covers a large variety of scenarios; a wide range of relevant frequencies and amplitudes are taken into account in under and above‐rated wind conditions. A total of more than 28 unique cases have been defined and simulated with both fidelity models. The results include the downstream evolution of the wake recovery and intensity of the turbulent disturbances induced by the rotor. The generic nature of the study allows to characterize the flow and performance effects and enables subsequent generalization to floater designs of given natural frequency and motion amplitude. It has been found that the BEM and LL predictions of the maximum loading in the blade root and tower bottom compare quite well, except for the case of large oscillation frequency in above rated conditions, where the BEM method under‐predicts the loads. Moreover, the use of a vortex solver makes it possible to look in depth into the wake characteristics, in which large differences are observed between the bottom‐fixed and the floating case in non‐turbulent inflow conditions. It has been found that the frequency and amplitude of the turbine oscillations can have a strong impact on the recovery of the wake. Moreover, we have found a link between short time intervals of large FA blade tip displacements and a faster break down of the wake. Finally it has been shown that a floating wind turbine with large and fast oscillations can transition between the differ...

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“…This was originally proposed by Sørensen [1] for HAWTs and validated for turbulent inflows in [2] and [3]. Several studies have been published on actuator line modelling of HAWTs, however applications on floating structures are limited to studies in [4], [5]. ALM results of DTU 10 MW scaled model were provided in [6] and available in OC6 Phase III [7].…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of actuator-Line modeling of FOWT rotor aerodynamics to wind tunnel experiments

Sanvito,

Persico,

Schito

et al. 2023

J. Phys.: Conf. Ser.

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The paper presents aerodynamic analyses of the scaled DTU 10MW laboratory model with surge and pitch platform motion in controlled environment applying an Actuator Line Method (ALM) to reproduce the experiments conducted in the large-scale Wind Tunnel of the Politecnico di Milano during UNAFLOW and OC6 Phase III test campaigns. The Effective Velocity Method (EVM) is implemented in the in-house ALM solver to sample the velocity at actuator points and determine the angle of attack. Fixed-bottom wind turbine URANS simulations reveal that thrust and torque deviations are within 3% and 5% respectively to experimental counterparts. Platform surge and pitch are simulated with ALM adopting a combination of motion frequencies and amplitudes finding a good agreement with experimental counterparts both in terms of loads and wake quantities. This paper also shows the capability of in-house ALM to model control strategies, imposing sinusoidal variation of blade collective pitch, which might generate dynamic inflow conditions. An in-depth cross comparison is conducted on FOWT wake quantities to investigate the flow behaviour and wake recovery induced by floating motion.

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Comparison of the free vortex wake and actuator line methods to study the loads of a wind turbine in imposed surge motion

Cited by 10 publications

References 14 publications

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

Investigation of the floating IEA Wind 15 MW RWT using vortex methods Part I: Flow regimes and wake recovery

Comparative assessment of actuator-Line modeling of FOWT rotor aerodynamics to wind tunnel experiments

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