Wind and Drivetrain Conference 2012 - · PDF fileWind and Drivetrain Conference 2012 ......

SIMPACK AG 2012, All rights reserved.
General
Steve MulskiDirector Wind Energy Solutions
Wind and Drivetrain Conference 2012Modeling Elements, Database Management, DLC Calculations

SIMPACK AG 2012 All rights reserved. Page 2September 2012 Steve Mulski
SIMPACK Wind and Drivetrain Conference
SIMPACK Introduction
Agenda
Modelling in SIMPACK
Aerodynamics
Hydrodynamics
Flexible bodies /Bearings / Gears
Database
Control Interfaces
Analysis Methods:
Resonance Analysis
Transient Analysis
Order Analysis
Stress and Durability
Load Calculations
Conclusion
2001

Aerodynamics
Large forces, non-linear transients, stall, tower shadow, etc.

Aerodynamics
Blade Element Theory
Interface to AeroDyn v13, NREL
Interface to Aero-Module, ECN
Non-linear Lifting Line Vortex Wake Theory
Interface to Aero-Module, ECN
Reynolds-averaged Navier Stokes
Co-simulation with CFD codes

5
Load case calculations(and power performance
predictions): Need of more
accurate prediction of wind
loading in time domain for
further reduction of Cost
of Energy!
Result of many years ofresearch and industrial
projects have been
assembled
Flexible approach is offeredto compromise between
modeling accuracy and
computation time
Standard interface to SIMPACK
ECN Aero-Module
Aerodynamics

ECN PHATAS formulation as starting point
ECN Dynamic Inflow model (ECN-C-94-107)
ECN Yaw/Tilt model (ECN-CX-98-070)
Many other advanced engineering extensions, continuousimprovement based on wind tunnel results and comparisonto more detailed models (e.g. AWSM)
Current state of the art, BUT limitations:
- Dynamic effects are approximated (wake not resolved)
- Radial independence assumed
- 2D model: no spanwise flow, planar rotor geometry
6
ECN Aero-Module (BEM)
Aerodynamics

Aero-Module (AWSM)
Based on non-linear lifting line vortex wake theory
Input of aerodynamic coefficients still necessary, but..
Enhanced modeling of
- Dynamic inflow effects (e.g. pitch step)
- Yawed flow
- Tip effect
- Radial dependence included
- Curved blade axis (sweep, winglet)
Ideal compromise between BEM and CFD
To be used for more complex load cases and geometries
7
ECN Aero-Module (AWSM)
Aerodynamics

8
NASA Ames Dynamic inflow
Visit our stand for more details!!!!!!!!
Aerodynamics

Simulation of standard loadcases, IEC61400-1, GL2010
Structural dynamics:
Multi-DOF MBS models (SIMPACK)
Aerodynamics:
Blade-element-momentum theory - BEM (AeroDyn, NREL; AeroModule, ECN)
Lifting-Line Free Vortex Wake method - AWSM (AeroModule, ECN)
Computational Fluid Dynamics CFD - (FLOWer, DLR)
SWE Task: Advanced Aeroelastic Design Process
[Stuttgart Wind Energy (SWE) ]

IEC DLC 1.4 Extreme Coherent Gust with Direction Change (ECD)
Comparision of BEM and AWSM Blade tip deflection
Applying the advanced aerodynamic method offers more accurate
loads and deflections compared to the BEM approach
In case of IEC DLC 1.4 the blade tip deflection is predicted to besignificantly lower!
SWE Task: Advanced Aeroelastic Design Process Exemplary Results

User Force Element
HydroDyn (NREL), modified by SWEfor coupling with SIMPACK
Validated with OC3 Phase IV results
Validated with FAST HydroDynSimulations
Experimental validation planned
SWE Task: SIMPACK Offshore - Hydrodynamics Force Element

Non-linear MBS Mooring Line
Integrated FOWT system simulation
Hydrodynamic forces computed with modified
Morison Equation
Validation against quasi-static model (HydroDyn)
SWE Task: SIMPACK Offshore - MBS Mooring System
[Stuttgart Wind Energy (SWE) ]

Application: Tidal Currents Turbines
Simulation of fluid-structure-interaction basedon MBS and CFD
Multi-body-Code: SIMPACK
CFD-Code: Ansys CFX
Time scheme with full implicit iterations betweenSIMPACK and CFX
Simulation of Aeroelastics rstructure/rfluid > 1000
and Hydroelastics rstructure/rfluid 1
SWE Task: Fluid-Structure-Interaction on Tidal Current Turbines (In Cooperation with Voith AG)
[Voith AG]
advance in time withsuccessive exchange ofdata in each time step
deformation at discretelocations
CFD (Ansys CFX) Multibody (Simpack)
loads for discrete areas
Examplecase: Turek FSI 3-Benchmark:
[Voith AG]

Tank Container with Sloshing Load
Tank Container with Sloshing Load
Discrete Element Method (DEM)
Co-simulation with PASIMODO
Modeling Elements

Modeling Elements
Tower
Rotorblades
Shafts
Detailed FE
Flexible Bodies

Modeling Elements
Flexible structures using beam elements
(i.e shafts, towers, rotor blades)
Non-linear bending (2nd Order)
Mass and shear centre offset
Rotorblade Pre-processor
SIMBEAM

Modeling Elements
Flexible Bodies Rotorblades
Rotorblade Generator (SIMBEAM)
Import from FE
Advanced
Basic

Modeling Elements
Flexible Bodies Detailed FE
Import from FE

Modeling Elements
Linear and non-linear stiffness and damping
6x6 Matrices
User Routines
Integrated specialized software
Complete contact model (not commonly done)
EHD
LAGER2
Bearings and Bushings

Modeling Elements, BEARINX
Bearing 3
Bearing 2
Bearing 1
SIMPACKCharacteristic mappreparation
Bearingcharacteristic
mapsBearing 1
2
CharacteristicmapDLL
SimulationPreprocessing
Loads and moments as a result of relative displacements between inner- and outer ring by means ofcharacteristic maps

Modeling Elements
Kinematic gear elements:
standard transmission
differential gearbox
planetary gearbox
Dynamic gear elements
(stiffness, damping, friction)
Sophisticated tooth wheel element
Extensive Library of Gear Elements

Modeling Elements
Torque Converters
FVA Models
Detailed SIMPACK Gear Pair
Gear Pairs

Modeling Elements
Ladle Crane
Fault Simulation
Ladle Crane

Modeling Elements
Meshing Frequencies
Misalignments
Profile and Flank Modification
Gear Pairs

Modeling Elements
Spline Coupling

SIMPAC

Wind and Drivetrain Conference 2012 - · PDF fileWind and Drivetrain Conference 2012 ......

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