2.5D large eddy simulation of vertical axis wind turbine in consideration of high angle of attack flow

2013 ◽  
Vol 51 ◽  
pp. 317-330 ◽  
Author(s):  
Chao Li ◽  
Songye Zhu ◽  
You-lin Xu ◽  
Yiqing Xiao
Keyword(s):  
Large Eddy Simulation ◽  
Wind Turbine ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
High Angle ◽  
Vertical Axis Wind Turbine ◽  
High Angle Of Attack ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation

2021 ◽  
pp. 1475472X2110551
Author(s):  
Aya Aihara ◽  
Karl Bolin ◽  
Anders Goude ◽  
Hans Bernhoff
Keyword(s):  
Large Eddy Simulation ◽  
Wind Turbine ◽  
Sound Pressure ◽  
Vertical Axis ◽  
Low Noise ◽  
Speed Ratio ◽  
Acoustic Analogy ◽  
Vertical Axis Wind Turbine ◽  
Eddy Simulation ◽  
Large Eddy

This study investigates the numerical prediction for the aerodynamic noise of the vertical axis wind turbine using large eddy simulation and the acoustic analogy. Low noise designs are required especially in residential areas, and sound level generated by the wind turbine is therefore important to estimate. In this paper, the incompressible flow field around the 12 kW straight-bladed vertical axis wind turbine with the rotor diameter of 6.5 m is solved, and the sound propagation is calculated based on the Ffowcs Williams and Hawkings acoustic analogy. The sound pressure for the turbine operating at high tip speed ratio is predicted, and it is validated by comparing with measurement. The measured spectra of the sound pressure observed at several azimuth angles show the broadband characteristics, and the prediction is able to reproduce the shape of these spectra. While previous works studying small-scaled vertical axis wind turbines found that the thickness noise is the dominant sound source, the loading noise can be considered to be a main contribution to the total sound for this turbine. The simulation also indicates that the received noise level is higher when the blade moves in the downwind than in the upwind side.

scholarly journals Large Eddy Simulation of Vertical Axis Wind Turbine Wakes

Energies ◽  
2014 ◽  
Vol 7 (2) ◽  
pp. 890-912 ◽  
Author(s):  
Sina Shamsoddin ◽  
Fernando Porté-Agel
Keyword(s):  
Large Eddy Simulation ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of Coflow Jet Airfoil at High Angle of Attack

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Hong-Sik Im ◽  
Ge-Cheng Zha ◽  
Bertrand P. E. Dano
Keyword(s):  
Large Eddy Simulation ◽  
Angle Of Attack ◽  
Weno Scheme ◽  
Quantitative Prediction ◽  
High Angle ◽  
High Angle Of Attack ◽  
Jet Mixing ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Lift And Drag

Large eddy simulation (LES) is conducted to investigate coflow jet (CFJ) airfoil flows at high angle of attack (AOA). The Smagorinsky model with Van Driest damping is employed to resolve the subgrid-scale stress. The fifth-order weighted essentially non-oscillatory (WENO) scheme is used for reconstruction of the inviscid flux and the fourth-order central differencing for the viscous flux. The LES results at an AOA of 0 deg, 12 deg, 25 deg, and 30 deg with momentum coefficients of Cμ = 0.15 and 0.08 are compared with the experiment to understand the flow structure of the jet mixing and flow separation. The quantitative prediction of lift and drag and qualitative prediction of vortex structures are in good agreement with experiment.

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