review of iea wind task 23 oc3 project operated for the u.s. department of energy office of energy...

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

IEA Wind Task 30 Kick-Off Meeting 5 National Renewable Energy Laboratory

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

IEA Wind Task 30 Kick-Off Meeting 8 National Renewable Energy Laboratory

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

IEA Wind Task 30 Kick-Off Meeting 10 National Renewable Energy Laboratory

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 – 7026jason.jonkman@nrel.gov