IEA Wind Task 23 OC3: Phase IV Results Regarding Floating Wind Turbine Modeling
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IEA Wind Task 23 OC3:Phase IV Results Regarding Floating Wind Turbine Modeling
Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute • Battelle
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EWEC 2010 2 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
Background
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EWEC 2010 3 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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EWEC 2010 4 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 recently initiated:– Phase V – Jacket– Phase VI – Floating semisubmersible
Ap
pro
ach
Ph
asesOC3 Approach & Phases
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EWEC 2010 5 National Renewable Energy Laboratory
Floating Challenges & Phase IV Model
• Low frequency modes:– Influence aerodynamic damping & stability
• Large platform motions:– Coupling with turbine
• Complicated shape:– Radiation & diffraction
• Moorings
• Statoil supplied data for 5-MWHywind conceptual design
• OC3 adapted spar to support the NREL 5-MW turbine:– Rotor-nacelle assembly unchanged– Tower & control system modified
Ch
alle
ng
esO
C3-
Hyw
ind
OC3-Hywind Model
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EWEC 2010 6 National Renewable Energy Laboratory
Aero-Hydro-Servo-Elastic Capabilities
FAST Bladed ADAMS HAWC2 3Dfloat Simo SESAM / DeepC
Code Developer NREL GH MSC + NREL
+ LUH Risø-DTU IFE-UMB MARINTEK DNV
OC3 Participant NREL + POSTECH GH NREL + LUH Risø-DTU IFE-UMB MARINTEK Acciona + NTNU
Aerodynamics ( BEM or GDW )
+ DS ( BEM or GDW )
+ DS ( BEM or GDW )
+ DS ( BEM or GDW )
+ DS ( BEM or GDW ) BEM None
Hydrodynamics Airy+ + ME,
Airy + PF + ME ( Airy+ or Stream )
+ ME Airy+ + ME,
Airy + PF + ME Airy + ME Airy + ME Airy + PF + ME Airy+ + ME,
Airy + PF + ME
Control System (Servo) DLL, UD, SM DLL DLL, UD DLL, UD, SM UD DLL None
Structural Dynamics (Elastic) Turbine: FEMP + ( Modal / MBS ), Moorings: QSCE
Turbine: FEMP + ( Modal / MBS ), Moorings: UDFD
Turbine: MBS, Moorings: QSCE,
UDFD
Turbine: MBS / FEM, Moorings: UDFD
Turbine: FEM, Moorings: FEM, UDFD
Turbine: MBS, Moorings: QSCE,
MBS
Turbine: MBS, Moorings: QSCE,
FEM
Airy+ – Airy wave theory +) with free surface corrections BEM – blade-element / momentum DLL – external dynamic link library DNV – Det Norsk Veritas DS – dynamic stall
GDW – generalized dynamic wake FEMP – finite-element method P) for mode preprocessing only MBS – multibody-dynamics formulation ME – Morison’s equation MSC – MSC Software Corporation
PF – linear potential flow with radiation & diffraction
QSCE – quasi-static catenary equations SM – interface to Simulink® with MATLAB® UD – implementation through user-defined
subroutine available UDFD – implementation through user-defined force-
displacement relationships
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EWEC 2010 7 National Renewable Energy Laboratory
Phase IV Load Cases
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EWEC 2010 8 National Renewable Energy Laboratory
Output Parameters (57 Total)
Rotor BladeLoads & Deflections13 Outputs
Drivetrain & GeneratorLoads & Operation
7 Outputs
TowerLoads & Deflections
15 Outputs
EnvironmentWind & Waves4 Outputs
PlatformDisplacements6 Outputs
Mooring SystemFairlead & Anchor
Tensions & Angles12 Outputs
Output Parameters & Results Legend
Results Legend
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EWEC 2010 9 National Renewable Energy Laboratory
Full-System Eigenanalysis
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EWEC 2010 10 National Renewable Energy Laboratory
Free Decay
Free Decay in Platform Surge
Free Decay in Platform Pitch
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EWEC 2010 11 National Renewable Energy Laboratory
Hydro-Elastic Responsewith Regular Waves
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EWEC 2010 12 National Renewable Energy Laboratory
Hydro-Elastic Responsewith Irregular Waves
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EWEC 2010 13 National Renewable Energy Laboratory
Aero-Hydro-Servo-Elastic Responsewith Regular Waves
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EWEC 2010 14 National Renewable Energy Laboratory
Aero-Hydro-Servo-Elastic Responsewith Irregular Waves
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EWEC 2010 15 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
• Future work will consider offshore jacket & semisubmersible
• Verification is critical to advance offshore windSpar Concept by SWAYSemisubmersible Concept
Summary
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Thank You for Your Attention
Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute • Battelle
Jason Jonkman, Ph.D.+1 (303) 384 – [email protected]