Application of Liutex for Analysis of Complex Wake Flows Characteristics of the Wind Turbine

Huang, Yang; Cao, Liushuai; Wan, Decheng

doi:10.1007/978-3-030-70217-5_24

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Whereas Wang adopted the OpenFOAM software to investigate the response of a full-scale wind turbine by using the second-generation (Q) vortex identification method. Huang (Huang et al, 2021) studied the wake characteristics of the spar-type real-scale floating wind turbine by using the coupling method of actuator line (AL) and RANS, and introduced the latest third-generation W vortex identification method to visualize the vortex arrangement in post-processing.…”

Section: Introductionmentioning

confidence: 99%

Research on complex wake interference of aligned rotors considering the precone variation of the upstream wind turbine

Zhang

Sun

et al. 2022

Front. Mar. Sci.

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To understand the interaction wake effects of aligned horizontal-axis wind turbines, a refined and low-cost wake simulation framework is developed by combining the actuator line (AL) with a local dynamic Smagorinsky (LDS) model. Firstly, the published performance of the NREL-5MW wind turbine is used to corroborate the accuracy of the AL-LDS coupling model. Secondly, the research is extended to predict the interference between two tandem rotor wakes. The influence of the precone characteristics on the overall wake and power output of the tandem wind turbines is explored by modifying the upstream wind turbine and introducing the latest third-generation Ω vortex identification method in the post-processing procedure. According to results, the tandem wind turbines have complex wake interference, with the precone angle variation always reducing the global output power, and leading to an unstable downstream turbine wake. This is detrimental to system lifespan due to high performance fluctuation and stress and as well may have ecological implications due to sediment alteration. From results, an upwind turbine with precone angle (negative) can lead to higher downstream but lower upstream turbine performance, compared with a non-tilted turbine. Despite the optimal precone angle of the upstream wind turbine is 0°, a -2.5° proves more advantageous owing to the large flexible deformation of the turbine wingtips. The findings can serve as a continuous incentive for improving wind farm numerical simulation.

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Section: Introductionmentioning

confidence: 99%

Research on complex wake interference of aligned rotors considering the precone variation of the upstream wind turbine

Zhang

Sun

et al. 2022

Front. Mar. Sci.

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The Applicability of Third Vortex Identification Methods on Atmospheric Boundary Layer and Wind Turbine Wakes

Xu¹,

Zhao²,

Wan³

2023

Springer Proceedings in Physics

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Wake interference of tandem wind turbines considering pitch strategy based on the AL-LDS-Ωnew coupling method

Ji,

Kong,

Sun

et al. 2024

Front. Energy Res.

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This paper establishes a high-fidelity and efficient Computational Fluid Dynamics (CFD) numerical method (AL-LDS-Ωnew) for wind turbine wake by combining the actuator line (AL), the localized dynamic Smagorinsky (LDS) sub-grid scale (SGS), and the new generation Ωnew vortex identification method under the framework of large eddy simulation. The model advantages are encouraging: 1) In terms of turbine modeling, the AL model is adopted to replace the traditional three-dimensional solid model, which avoids solving the boundary layer on the blade surface and improves computational efficiency; 2) In terms of wake simulation, the LDS SGS model is used to model turbulence, reducing vortex dissipation and further improving the refinement of turbine wake; 3) In terms of vortex identification, the new generation Ωnew vortex identification method avoids the difficult threshold selection in previous vortex identification and captures more refined vortex structures. The accuracy of the model is validated against published data of a NREL 5 MW wind turbine, and then extended to simulate the wake interference of tandem twin-rotor turbines by changing the pitch angle of the upstream wind turbine (WT1). The influence mechanisms between array wake interference and energy conversion efficiency under the pitch strategy are explored, demonstrating the AL-LDS-Ωnew coupling method is computationally accurate and efficient for simulating the complex wake interference. From analyses, the pitch strategy can effectively suppress the wake effect of the upstream turbine (WT1) and increase the power output of the downstream turbine (WT2), thus improving the overall output power of the array farm. Compared with the non-pitch condition (0 pitch angle), a pitch angle of (2°) maximizes the global energy conversion efficiency of the twin-rotor array: power augmentation by 0.29%, and thrust reduction by 5%. This optimal state reduces the fatigue load of the turbine and is more conducive to long-term operation. The findings, whilst preliminary, encourage the use of turbine pitch strategies in the wind farm planning and operation.

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Application of Liutex for Analysis of Complex Wake Flows Characteristics of the Wind Turbine

Cited by 3 publications

References 21 publications

Research on complex wake interference of aligned rotors considering the precone variation of the upstream wind turbine

Research on complex wake interference of aligned rotors considering the precone variation of the upstream wind turbine

The Applicability of Third Vortex Identification Methods on Atmospheric Boundary Layer and Wind Turbine Wakes

Wake interference of tandem wind turbines considering pitch strategy based on the AL-LDS-Ωnew coupling method

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