A CFD study into the influence of unsteady aerodynamic interference on wind turbine surge motion

Tran, Thanh Toan; Kim, Dong-Hyun

doi:10.1016/j.renene.2015.12.013

Cited by 133 publications

(72 citation statements)

References 29 publications

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“…Other frequencies, in particular if not harmonics of the rotor rotational frequency, could lead to much more complex wake dynamics. Compared to numerical wake analyses by Tran and Kim [9] under 6 degrees of freedom of the platform motion, or Farrugia et al [5] under surge only motion, the wake here is much more unstable, with vortex merging beginning already 1.5 rotor radii downstream of the turbine. This difference can be explained by the highly unsteady conditions of the chosen wave motion due to the low wake reduced velocity.…”

Section: Near-wake Analysismentioning

confidence: 54%

“…Several studies have been dedicated to the study of offshore wind turbines under only surge motion ( [2], [3], [4], [5]), only pitch motion ( [6], [7]), or a combination of different platform motions ( [8], [9]). Bayati et al [8] evaluated the unsteady aerodynamics of floating offshore wind turbines as function of the amplitude and frequency of mono-harmonic surge and pitch motions.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the numerical analyses are based on simplified approaches, like wake dynamic models, BEM theory or Generalized Dynamic Wake model (GDW), and take as reference simulations with the actuator disc model. Only Farrugia et al [5] used a lifting line method in a free-wake vortex code to perform a detailed analysis of the rotor and wake unsteadiness under surge motion, and Tran and Kim [9] performed high-fidelity Computational Fluid Dynamics (CFD) simulations. In the same way, the current investigation aims at performing high-fidelity simulations of a floating wind turbine under monoharmonic surge motion, allowing a more detailed insight into the wake flow physics.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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Section: Near-wake Analysismentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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“…As a result of the thin twist blades with their highly complex shape of the FX93-2500 wind turbine, the difficulty and quantity of the structured mesh generation are greatly increased. The fluid computational domain contained, on average, 13,953,703 hexahedral mesh elements, which was several times larger than the previous wind farm CFD studies [1,18,19,22,30,31]. …”

Section: Computational Domains and Mesh Generationmentioning

confidence: 99%

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

2016

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Abstract:Super typhoon activity is likely to make the electric power network fail, or blow the wind-measuring device off, which all lead to the yaw control system of wind turbine being inactive. Under this condition, blades can be blown by the violent side wind from unfavorable directions, and the aerodynamic loads on the wind turbine will be increased by a large amount, which can lead to low-cycle fatigue damage and other catastrophic collapses. So far, not enough consideration has been given to the above problems in wind turbine design. Using the transient computational fluid dynamics (CFD), this study investigates the wind load characteristics of offshore wind turbines under typhoon condition with 360-degree full wind directions. Two primary influence factors of the aerodynamic characteristics of wind turbines are clarified: variation of the wind direction and different parking positions of the wind rotor. Using 3D-numerical simulation results, this study provides detailed references for the ultimate strength and fatigue life in wind turbine design, and presents the best parking position of the wind turbine with a free yawing strategy.

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“…Yin et al 22 analyzed the system design, basic dynamic characteristics, thermal losses, and management aspects; hydro-viscous transmission was applied to enhance the overall efficiency. The interference of wind turbine surge motion was discussed in Tran and Kim 23 as a result of CFD and blade element momentum (BEM) analyses.…”

Section: Introductionmentioning

confidence: 99%

Developing the process in matching a wind turbine system to attain optimal performance

Kao

2016

Advances in Mechanical Engineering

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The objective of this article is to develop the procedure in the matching of turbine blades and generator to increase the efficiency of a wind turbine. Hydrodynamic simulation of turbine blades and the logic setting of the controller are always focused on obtaining maximum power from the turbine system. Research on the matching of the two systems, turbine blades and the generator, is rare. If turbine blades are not initially well matched with the generator, the optimal design of the turbine blades to reach peak performance will not be realized, and the controller will be unable to increase the power capture. Thus, the matching problem is worthy of being discussed. In this article, the efficiency of the wind turbine system is increased by determining the optimal constant voltage mode of the generator. As the optimal constant voltage mode is selected, the characteristics of the operating points, such as tip speed ratio, revolutions per minute, blade torque, and efficiency, can be identified by the crossover point of the T (torque)-N (r/min) curves of the turbine blades and the generator. A horizontal upwind turbine is treated as the study case here. It is suggested that the tip speed ratio value calculated by the determined revolutions per minute should be located in the high-efficiency region of efficiency curves of the turbine blades, but not in the steep-slope region of the selected constant voltage mode of the generator. The results show that, if the two systems operate well, the final output power at a low wind speed of 4-5 m/s will be increased by 65%-44%, and at a high wind speed of 10-12 m/s, it will be increased by 3%-5%.

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A CFD study into the influence of unsteady aerodynamic interference on wind turbine surge motion

Cited by 133 publications

References 29 publications

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

Developing the process in matching a wind turbine system to attain optimal performance

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