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Review of IEA Wind Task 23 OC3 Project

Review of IEA Wind Task 23 OC3 Project. IEA Wind Task 30 Kick-Off Meeting June 8, 2010 Jason Jonkman, Ph.D. Senior Engineer, NREL. Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC.

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Review of IEA Wind Task 23 OC3 Project

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  1. Review of IEA Wind Task 23OC3 Project IEA Wind Task 30Kick-Off Meeting June 8, 2010 Jason Jonkman, Ph.D. Senior Engineer, NREL Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC

  2. IEA Task 23 Organizational Structure

  3. OC3 Background • OWTs are designed using aero-hydro-servo-elastic codes • The codes must be verified to assess their accuracy

  4. OC3 Activities & Objectives The IEA Offshore Code Comparison Collaboration (OC3) is an international forum for OWT dynamics code verification • Discuss modeling strategies • Develop suite of benchmark models & simulations • Run simulations & process results • Compare & discuss results • Assess simulation accuracy & reliability • Train new analysts how to run codes correctly • Investigate capabilities of implemented theories • Refine applied analysis methods • Identify further R&D needs Activities Objectives

  5. OC3 Participants & Codes • 3Dfloat • ADAMS-AeroDyn-HydroDyn • ADAMS-AeroDyn-WaveLoads • ADCoS-Offshore • ADCoS-Offshore-ASAS • ANSYS-WaveLoads • BHawC • Bladed • Bladed Multibody • DeepC • FAST-AeroDyn-HydroDyn • FAST-AeroDyn-NASTRAN • FLEX5 • FLEX5-Poseidon • HAWC • HAWC2 • SESAM • SIMPACK-AeroDyn • Simo

  6. OC3 Coordination & Meetings • E-mail coordination • Net-meetings held every 1-2 months • Physical meetings held 1-2 times per year • IEA Wind Task 23 Website (now public!) • Database of model parameters & simulation results

  7. OC3 Approach & Phases Approach • All inputs are predefined: • NREL 5-MW wind turbine, including control system • Variety of support structures • Wind & wave datasets • A stepwise procedure is applied: • Load cases selected to test different model features • OC3 ran from 2005 to 2009: • Phase I: Monopile + Rigid Foundation • Phase II: Monopile + Flexible Found’tn • Phase III: Tripod • Phase IV: Floating Spar Buoy • 3-year follow-on project being initiated: • Phase V: Jacket • Phase VI: Floating semisubmersible Phases

  8. Load Cases 1.X – Full-System Eigenanalysis • Full-system flexibility • Elastic response only • Compared natural frequencies & damping ratios 2.X – Rigid • Rigid turbine • Aerodynamics without hydro: • Steady & turbulent winds • Hydrodynamics without aero: • Regular & irregular waves 3.X – Onshore Wind Turbine • Flexible tower, drivetrain, & rotor • Rigid substructure • Aero-servo-elastics without hydro: • Steady & turbulent winds 4.X – Inverted Pendulum • Flexible support structure • Rigid tower-top • Hydro-elastics without aero: • Regular & irregular waves 5.X – Full-System Dynamics • Full-system flexibility • Full aero-hydro-servo-elastics: • Steady winds with regular waves • Turbulent winds with irregular waves

  9. Output Parameters

  10. Papers & Final Report • 1 conference paper per phase published/presented: • Phase I: Torque, 2007 • Phase II: EOW, 2007 • Phase III: AIAA, 2009 • Phase IV: EWEC, 2010 • Final report reviewing all phases, including updated results submitted since paper publication • Journal article in progress?

  11. Summary • OC3 aims to verify OWT dynamics codes • Simulations tested a variety of OWT types & model features • Code-to-code comparisons have agreed well • Differences caused by variations in: • Model fidelity • Aero- & hydrodynamic theory • Model discretization • Numerical problems • User error • Task 30 will consider offshore jacket & semisubmersible • Verification is critical to advance offshore wind Spar Concept by SWAY Semisubmersible Concept

  12. Thank You for Your Attention Jason Jonkman, Ph.D. +1 (303) 384 – 7026 jason.jonkman@nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC

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