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

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

Research output: Contribution to conferencePaper

1 Citation (Scopus)

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. Simulations with and without the instrumentation enclosure that was present during the NREL experiments were performed. It was found that the enclosure influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the enclosure. 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.
LanguageEnglish
Publication statusPublished - 20 Apr 2010
EventEuropean Wind Energy Conference - Warsaw, Poland
Duration: 20 Apr 201023 Apr 2010

Conference

ConferenceEuropean Wind Energy Conference
CityWarsaw, Poland
Period20/04/1023/04/10

Fingerprint

Vorticity
Wind turbines
Navier Stokes equations
Turbomachine blades
Enclosures
Rotors
Radial flow
Flow separation
Computational methods
Aerodynamics
Computer simulation
Experiments

Keywords

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

Cite this

Kim, D. H., Yu, D. O., Kwon, O. J., Fletcher, T. M., Scheurich, F., & Brown, R. (2010). Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. Paper presented at European Wind Energy Conference, Warsaw, Poland, .
Kim, Da Hye. ; Yu, Dong Oh ; Kwon, Oh Joon ; Fletcher, Timothy M. ; Scheurich, Frank ; Brown, Richard. / Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. Paper presented at European Wind Energy Conference, Warsaw, Poland, .
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Kim, DH, Yu, DO, Kwon, OJ, Fletcher, TM, Scheurich, F & Brown, R 2010, 'Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies' Paper presented at European Wind Energy Conference, Warsaw, Poland, 20/04/10 - 23/04/10, .

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

2010. Paper presented at European Wind Energy Conference, Warsaw, Poland, .

Research output: Contribution to conferencePaper

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AU - Kim, Da Hye.

AU - Yu, Dong Oh

AU - Kwon, Oh Joon

AU - Fletcher, Timothy M.

AU - Scheurich, Frank

AU - Brown, Richard

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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. Simulations with and without the instrumentation enclosure that was present during the NREL experiments were performed. It was found that the enclosure influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the enclosure. 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. Simulations with and without the instrumentation enclosure that was present during the NREL experiments were performed. It was found that the enclosure influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the enclosure. 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.

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KW - unsteady three-dimensional flow

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M3 - Paper

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Kim DH, Yu DO, Kwon OJ, Fletcher TM, Scheurich F, Brown R. Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. 2010. Paper presented at European Wind Energy Conference, Warsaw, Poland, .