review of iea wind task 23 oc3 project operated for the u.s. department of energy office of energy...
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Review of IEA Wind Task 23OC3 Project
Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC
IEA Wind Task 30Kick-Off Meeting
June 8, 2010
Jason Jonkman, Ph.D.Senior Engineer, NREL
IEA Wind Task 30 Kick-Off Meeting 2 National Renewable Energy Laboratory
IEA Task 23 Organizational Structure
IEA Wind Task 30 Kick-Off Meeting 3 National Renewable Energy Laboratory
• OWTs are designed using aero-hydro-servo-elastic codes• The codes must be verified to assess their accuracy
Wind Turbine & Support StructureApplied Loads
External Conditions
Soil
Hydro-dynamics
Aero-dynamics
Waves & Currents
Wind-InflowPower
GenerationRotor
Dynamics
Substructure Dynamics
Foundation Dynamics
Drivetrain Dynamics
Control System
Soil-Struct. Interaction
Nacelle Dynamics
Tower Dynamics
OC3 Background
IEA Wind Task 30 Kick-Off Meeting 4 National Renewable Energy Laboratory
• 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
Act
ivit
ies
Ob
ject
ives
OC3 Activities & Objectives
The IEA Offshore Code Comparison Collaboration (OC3) is an international forum for OWT dynamics code verification
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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
IEA Wind Task 30 Kick-Off Meeting 6 National Renewable Energy Laboratory
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
IEA Wind Task 30 Kick-Off Meeting 7 National Renewable Energy Laboratory
• 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
Ap
pro
ach
Ph
asesOC3 Approach & Phases
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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
IEA Wind Task 30 Kick-Off Meeting 9 National Renewable Energy Laboratory
Output Parameters
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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?
IEA Wind Task 30 Kick-Off Meeting 11 National Renewable Energy Laboratory
• 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 windSpar Concept by SWAYSemisubmersible
Concept
Summary
Thank You for Your Attention
Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC
Jason Jonkman, Ph.D.+1 (303) 384 – [email protected]