Large Eddy Simulation of flow around a single and two in-line horizontal-axis wind turbines

Allah, Veisi Amin; Mayam, Mohammad Hossein Shafiei

doi:10.1016/j.energy.2017.01.052

Cited by 19 publications

(9 citation statements)

References 43 publications

(44 reference statements)

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“…Kuo 18 identified SS as the most accurate among the methods. However, Chamorro 19 found that the wake recovery speed of two wind turbines with an in-line setup is sometimes higher than that of a single wind turbine. Meanwhile, the SS method leads to a deficit in the mixed-wake velocity, which must be higher than that of the single unit.…”

Section: Introductionmentioning

confidence: 99%

Optimized wake-superposition approach for multiturbine wind farms

Chang

et al. 2023

Sci Rep

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Optimizing the wind farm layout requires accurately quantifying the wind-turbine wake distribution to minimize interference between wakes. Thus, the accuracy of wind turbine wake superposition models is critical. The sum of squares (SS) model is currently touted as the most accurate, but its application in engineering is hampered by its overestimation of the velocity deficit of the mixed wake. Therefore, previous work relied on approximate power calculations for performing optimization. The physical meaning of the SS model is unclear, which makes optimization difficult. In this study, a univariate linear correction idea is proposed based on the linear increase phenomenon of the SS method error. The unknown coefficients are obtained by fitting experimental data. The results demonstrate that the proposed method can accurately quantify the full-wake two-dimensional distribution of the mixed wake.

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Section: Introductionmentioning

confidence: 99%

Optimized wake-superposition approach for multiturbine wind farms

Chang

et al. 2023

Sci Rep

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“…The class of CFD methods has the potential to provide the most consistent and physically realistic solution of the wind turbine flow field. Veisi and Mayam 38,39 employed large eddy simulation to study the effect of rotation direction of the downstream turbine in a two in-line setup. The results showed good agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Load control and unsteady aerodynamics for floating wind turbines

Shen

Zhu

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Unlike fixed-base offshore wind turbine, the soft floating platform introduces 6 more degrees of freedom of motions to the floating offshore wind turbine. This may cause much more complex inflow environment to the wind turbine rotors compared with fixed-base wind turbine. The wind seen locally on the blade changes due to the motions of the floating wind turbine platform which has a direct impact on the aerodynamic condition on the blade such as the angle of attack and the inflow velocity. Such unsteady aerodynamic effects may lead to high fluctuation of the loads and power output. The present work aims to study the high unsteady aerodynamic performance of the floating wind turbine under platform surge motion. The unsteady aerodynamic loads are predicted with a lifting surface method with a free wake model. A preview predict control algorithm is used as the pitch control strategy. A full scale U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) 5 MW floating wind turbine is chosen as the subject of the present study. The unsteady aerodynamic performance and instabilities have been discussed in detail under prescribed platform surge motions with different control targets. Both minimizing the power output and rotor thrust fluctuation are set as the control objectives respectively. The theory analysis and the simulation results indicate that the blade pitch control can effectively alleviate the variation of the rotor thrust under platform surge motions. Larger amplitude of the variation of blade pitch is needed to alleviate the variation of the wind turbine power and this leads to high rotor thrust fluctuation. It is also shown that negative damping can be achieved during the blade pitch control process and may lead the floating platform wind turbine system into unstable condition.

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“…3 The unsteady aerodynamic performance of floating wind turbine has been studied with both experimental and numerical methods. 7,26 With the improvement of computational fluid dynamic (CFD) methods based on solving Navier-Stokes flow functions and computational resources, CFD have been widely used for the aerodynamic performance study of wind turbines such as the wind turbine blades tower interaction by Janajreh et al; 27 the detailed flow mechanism at the inboard region of the blade was analyzed by Bangga et al; 28 and the aerodynamic interaction between the rotor wake and the wind farm terrain was analyzed by Nedjari et al, 29 Veisi and Mayam 30,31 and Miao et al 32 CFD simulation on floating wind turbines has been applied, [33][34][35][36][37][38] which can provide detailed flow field characteristics of the floating wind turbines under platform motions.…”

Section: Introductionmentioning

confidence: 99%

“…; 27 the detailed flow mechanism at the inboard region of the blade was analyzed by Bangga et al. ; 28 and the aerodynamic interaction between the rotor wake and the wind farm terrain was analyzed by Nedjari et al., 29 Veisi and Mayam 30,31 and Miao et al. 32…”

Section: Introductionmentioning

confidence: 99%

The unsteady aerodynamics of floating wind turbine under platform pitch motion

Shen

Chen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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The aerodynamic performance of floating platform wind turbines is much more complex than fixed-base wind turbines because of the flexibility of the floating platform. Due to the extra six degrees-of-freedom of the floating platform, the inflow of the wind turbine rotors is highly influenced by the motions of the floating platform. It is therefore of interest to study the unsteady aerodynamics of the wind turbine rotors involved with the interaction of the floating platform induced motions. In the present work, a lifting surface method with a free wake model is developed for analysis of the unsteady aerodynamics of wind turbines. The aerodynamic performance of the NREL 5 MW floating wind turbine under the prescribed floating platform pitch motion is studied. The unsteady aerodynamic loads, the transient of wind turbine states, and the instability of the wind turbine wakes are discussed in detail.

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Large Eddy Simulation of flow around a single and two in-line horizontal-axis wind turbines

Cited by 19 publications

References 43 publications

Optimized wake-superposition approach for multiturbine wind farms

Optimized wake-superposition approach for multiturbine wind farms

Load control and unsteady aerodynamics for floating wind turbines

The unsteady aerodynamics of floating wind turbine under platform pitch motion

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