Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies

Dong Oh Yu, Oh Joon Kwon, Timothy M. Fletcher, Frank Scheurich, Richard Brown

Research output: Contribution to conferencePaper

Abstract

Numerical simulations of the NREL phase VI wind turbine operating in yawed conditions have been performed using two computational methods; one based on the solution of the Reynolds-averaged Navier-Stokes equations (RANS) using unstructured overset meshes and one known as the Vorticity Transport Model (VTM) that is based on the solution of the vorticity transport equation. The effect of the hub that was present during the NREL experiments was investigated by modeling the hub in the RANS simulations. It was found that the hub influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the hub. Both the RANS and VTM codes are able to predict well the unsteady and time-averaged aerodynamic loadings on the wind turbine blades at low wind speeds. At high wind speeds, leading-edge flow separation and strong radial flow are observed on the suction surface of the blades, when the blades are at the retreating side of the rotor. Both the RANS and VTM codes provide less accurate predictions of the blade loads. However, at the advancing side of the rotor, the flow is mostly attached to the surface of the blade, and both the RANS and VTM predictions of the blade loads are in good agreement with the measured data.

Conference

ConferenceAnnual Conference of the Korea Wind Energy Association
CitySeoul, Korea
Period7/04/109/04/10

Fingerprint

Reynolds Equation
Wind Turbine
Vorticity
Blade
Wind turbines
Navier Stokes equations
Turbomachine blades
Navier-Stokes Equations
Methodology
Prediction
Wind Speed
Rotors
Rotor
Radial flow
Flow separation
Computational methods
Flow Separation
Turbine Blade
Aerodynamics
Suction

Keywords

  • wind turbine
  • RANS
  • vorticity transport model
  • yaw
  • unsteady three-dimensional flow

Cite this

Yu, D. O., Kwon, O. J., Fletcher, T. M., Scheurich, F., & Brown, R. (2010). Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. Paper presented at Annual Conference of the Korea Wind Energy Association, Seoul, Korea, .
Yu, Dong Oh ; Kwon, Oh Joon ; Fletcher, Timothy M. ; Scheurich, Frank ; Brown, Richard. / Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. Paper presented at Annual Conference of the Korea Wind Energy Association, Seoul, Korea, .
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abstract = "Numerical simulations of the NREL phase VI wind turbine operating in yawed conditions have been performed using two computational methods; one based on the solution of the Reynolds-averaged Navier-Stokes equations (RANS) using unstructured overset meshes and one known as the Vorticity Transport Model (VTM) that is based on the solution of the vorticity transport equation. The effect of the hub that was present during the NREL experiments was investigated by modeling the hub in the RANS simulations. It was found that the hub influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the hub. Both the RANS and VTM codes are able to predict well the unsteady and time-averaged aerodynamic loadings on the wind turbine blades at low wind speeds. At high wind speeds, leading-edge flow separation and strong radial flow are observed on the suction surface of the blades, when the blades are at the retreating side of the rotor. Both the RANS and VTM codes provide less accurate predictions of the blade loads. However, at the advancing side of the rotor, the flow is mostly attached to the surface of the blade, and both the RANS and VTM predictions of the blade loads are in good agreement with the measured data.",
keywords = "wind turbine, RANS, vorticity transport model, yaw, unsteady three-dimensional flow",
author = "Yu, {Dong Oh} and Kwon, {Oh Joon} and Fletcher, {Timothy M.} and Frank Scheurich and Richard Brown",
year = "2010",
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note = "Annual Conference of the Korea Wind Energy Association ; Conference date: 07-04-2010 Through 09-04-2010",

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Yu, DO, Kwon, OJ, Fletcher, TM, Scheurich, F & Brown, R 2010, 'Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies' Paper presented at Annual Conference of the Korea Wind Energy Association, Seoul, Korea, 7/04/10 - 9/04/10, .

Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. / Yu, Dong Oh; Kwon, Oh Joon; Fletcher, Timothy M.; Scheurich, Frank; Brown, Richard.

2010. Paper presented at Annual Conference of the Korea Wind Energy Association, Seoul, Korea, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies

AU - Yu, Dong Oh

AU - Kwon, Oh Joon

AU - Fletcher, Timothy M.

AU - Scheurich, Frank

AU - Brown, Richard

PY - 2010/4/7

Y1 - 2010/4/7

N2 - Numerical simulations of the NREL phase VI wind turbine operating in yawed conditions have been performed using two computational methods; one based on the solution of the Reynolds-averaged Navier-Stokes equations (RANS) using unstructured overset meshes and one known as the Vorticity Transport Model (VTM) that is based on the solution of the vorticity transport equation. The effect of the hub that was present during the NREL experiments was investigated by modeling the hub in the RANS simulations. It was found that the hub influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the hub. Both the RANS and VTM codes are able to predict well the unsteady and time-averaged aerodynamic loadings on the wind turbine blades at low wind speeds. At high wind speeds, leading-edge flow separation and strong radial flow are observed on the suction surface of the blades, when the blades are at the retreating side of the rotor. Both the RANS and VTM codes provide less accurate predictions of the blade loads. However, at the advancing side of the rotor, the flow is mostly attached to the surface of the blade, and both the RANS and VTM predictions of the blade loads are in good agreement with the measured data.

AB - Numerical simulations of the NREL phase VI wind turbine operating in yawed conditions have been performed using two computational methods; one based on the solution of the Reynolds-averaged Navier-Stokes equations (RANS) using unstructured overset meshes and one known as the Vorticity Transport Model (VTM) that is based on the solution of the vorticity transport equation. The effect of the hub that was present during the NREL experiments was investigated by modeling the hub in the RANS simulations. It was found that the hub influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the hub. Both the RANS and VTM codes are able to predict well the unsteady and time-averaged aerodynamic loadings on the wind turbine blades at low wind speeds. At high wind speeds, leading-edge flow separation and strong radial flow are observed on the suction surface of the blades, when the blades are at the retreating side of the rotor. Both the RANS and VTM codes provide less accurate predictions of the blade loads. However, at the advancing side of the rotor, the flow is mostly attached to the surface of the blade, and both the RANS and VTM predictions of the blade loads are in good agreement with the measured data.

KW - wind turbine

KW - RANS

KW - vorticity transport model

KW - yaw

KW - unsteady three-dimensional flow

M3 - Paper

ER -

Yu DO, Kwon OJ, Fletcher TM, Scheurich F, Brown R. Prediction of unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. 2010. Paper presented at Annual Conference of the Korea Wind Energy Association, Seoul, Korea, .