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Jason Jonkman Sandy Butterfield Neil Kelley Marshall Buhl Gunjit Bir Bonnie Jonkman

Design Codes. Jason Jonkman Sandy Butterfield Neil Kelley Marshall Buhl Gunjit Bir Bonnie Jonkman Pat Moriarty Alan Wright Daniel Laird 2006 Wind Program Peer Review May 10, 2006. Outline of Presentation. Introduction & Background State of the Art Modeling & Limitations

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Jason Jonkman Sandy Butterfield Neil Kelley Marshall Buhl Gunjit Bir Bonnie Jonkman

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  1. Design Codes Jason Jonkman Sandy Butterfield Neil Kelley Marshall Buhl Gunjit Bir Bonnie Jonkman Pat Moriarty Alan Wright Daniel Laird 2006 Wind Program Peer Review May 10, 2006

  2. Outline of Presentation • Introduction & Background • State of the Art Modeling & Limitations • Program Contributions • Current & Future Work

  3. Introduction & BackgroundThe Big Picture

  4. Introduction & BackgroundDesign Loads Analysis Load Case Matrix Critical Locations • Design requirements are dictated by IEC standards • 100s-1000s of design load case (DLC) simulations must be considered

  5. Introduction & BackgroundModeling Requirements • Fully coupled aero-hydro-servo-elastic interaction • Wind-Inflow: • discrete events • turbulence • Waves: • regular • irregular • Aerodynamics: • induction • rotational augmentation • skewed wake • dynamic stall • Hydrodynamics: • scattering • radiation • hydrostatics • Structural dynamics: • gravity / inertia • elasticity • foundations / moorings • Control system: • yaw, torque, pitch

  6. Introduction & BackgroundCoupled Aero-Hydro-Servo-Elastic Simulation

  7. State of the Art Modeling & LimitationsWind-Inflow Design Research

  8. State of the Art Modeling & LimitationsAerodynamics & Aeroacoustics Design (AeroDyn) Research

  9. State of the Art Modeling & LimitationsOffshore Waves & Hydrodynamics (HydroDyn) Design (Fixed) Research (Floating)

  10. State of the Art Modeling & LimitationsStructural Dynamics 1st mode 2nd mode Design Conventional 3- Bladed Upwind Research GE 3.6 MW Prototype with Precurved Blades

  11. Program ContributionsUsers & Certification

  12. Program ContributionsSuccess Stories Bergey XL50 Clipper 2.5MW Liberty Southwest Windpower STORM NorthWind 100 GE 1.5MW AOC 15/50

  13. Program ContributionsDevelopment & Support NWTC Design Codes Website • Why does the U.S. DOE support codes development?: • design codes are a practical way for us to transfer wind energy knowledge to the industry • allows for customization flexibility • commercial products are black boxes • We support U.S. wind industry through: • websites • technical support • solicitation of user requirements • workshops

  14. Current & Future WorkWind-Inflow • Current work: • implemented Great Plains LLJ spectral model • use this spectral model to determine the effect these jets have on multi-MW LWSTs • document the development of TurbSim • Future plans (next 2 years): • analyze available Lamar LIDAR data to further validate Great Plains LLJ spectral model • hold a workshop on inflow turbulence issues and TurbSim training • Future opportunities: • plan field experiment to collect data on turbulence within large, multi-MW wind farms • form a multi-discipline, synergistic effort to understand the role of coherent turbulence on turbine drivetrain fatigue Sample TurbSim Wind Profiles

  15. Current & Future WorkAerodynamics & Aeroacoustics • Current aerodynamics work: • improved fidelity of unsteady wake model • tower influence • Current aeroacoustics work (reduced scope): • wind tunnel tests (Virginia Tech) • CFD, CAA & propagation codes (Penn State) • Future plans (next 2 years): • rewrite AeroDyn – make modular;provide hooks for other aerodynamic models • validation using wind tunnel (NASA Ames)and field measurements • add tower shadow noise model • Future Opportunities: • more wind tunnel and field tests • improve codes: • aerodynamics – vortex-wake and CFD methods • aeroacoustics – CAA prediction for tower shadow and tip noise CFD of Blade Tip Vortex (Uzun et al, 2006)

  16. Current & Future WorkOffshore Waves & Hydrodynamics • Future plans (next 2 years): • offshore foundations: • implement p-y & t-z curves • mooring dynamics: • interface LINES module (MIT) • support SeaCon studies • WFO analysis of ITI floating barge concept • Future opportunities: • add nonlinear breaking waves • add sea ice loading • add 2nd order effects • experimental validation • Current work: • Develop HydroDyn for linear hydrodynamic loading of fixed-bottom and floating systems • benchmarking via participation in IEA Annex XXIII OC3 Sample OC3 Simulation Results

  17. Current & Future WorkStructural Dynamics

  18. Current & Future WorkNew Horizons • Gearbox dynamics: • gearbox failures might be the resultof our codes inability to capture theinternal gear & bearing loads properly • Stability analysis: • the potential for instabilities increasefor advanced concepts like flexiblerotors and floating turbines • Tower shadow: • need tower wake measurements andmodel updates to support designimprovements of downwind rotors • Code validation: • all models must be validated with experimental data

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