Titelmasterformat durch Klicken bearbeiten Structural Design of Tidal Turbines using ANSYS Workbench Matthieu Morhan, OpenHydro, a Naval Energies Company CADFEM 2017 1
AGENDA Background to OpenHydro Various fields involved in the structural design of a tidal turbine Conclusions and recommendations CADFEM 2017 2
Who are we and what do we do? Company founded in 2005 Over 140 employees across 4 locations: Greenore, Dublin, Canada, France Design, manufacture, installation and maintenance of Open-Centre Tidal Turbines CADFEM 2017 3
Who are we and what do we do? CADFEM 2017 4
Who are we and what do we do? 3x 16m turbines deployed in 2016 1 in Canada 2 in France CADFEM 2017 5
Who are we and what do we do? Ultimate goal: Deliver the world s first commercial scale grid-connected tidal arrays CADFEM 2017 6
Who are we and what do we do? CADFEM 2017 7
How do we get to this? CADFEM 2017 8
Environmental conditions ADCP CADFEM 2017 9
Drag Coefficients USE of ANSYS CFX to derive drag coefficients CADFEM 2017 10
Drag Coefficients CADFEM 2017 11
Generator curves CADFEM 2017 12
Design envelopes Rotor Stator CADFEM 2017 13
Component loads Peak Loads Serviceability Loads Fatigue Loads CADFEM 2017 14
High-Performance Computing Typical computation stats using 6 HPCs 10x Professional (5x lease) 2x Premium 1x HPC Workgroup 16 (16 HPCs) CADFEM 2017 15
Full Turbine - Global Deformations CADFEM 2017 16
Full Turbine Load Transfers CADFEM 2017 17
Full Turbine - Bearing system Bearing reactions Bearing pressure CADFEM 2017 18
Full Turbine - Bearing system CADFEM 2017 19
Full Turbine - Bearing system - Tribology Bearing wear measurements Bearing wear analytical model Generation of Stribeck curves CADFEM 2017 20
Full Turbine Modal analysis 1.7Hz mode Lateral sway 5.2Hz mode Ovalisation CADFEM 2017 21
Stator Local stress concentration Equivalent Von-Mises Stress Bolting assessment using beams CADFEM 2017 22
Rotor Global Deformations Mesh Force maps Cyclic symmetry implemented using built-in CPCYC command CADFEM 2017 23
Rotor Ultimate Strength margin DNV-RP-C208 Total Strain Elastic-Plastic material model DNV-RP-C208 CADFEM 2017 24
Fatigue screening CADFEM 2017 25
Lifting assessment CADFEM 2017 26
Buckling RESERVE FACTOR = PREDICTED BUCKLING LOAD FACTORED LOAD Idealised analysis Identification of area of significant minimum principal stress CADFEM 2017 27
Summary Preliminary design Detailed design SPEED LOADS Rotor Stator SSB Combined Model Stator SSB Generator Bearings Workbench CADFEM 2017 28
Conclusions / Recommendations Idealisation of full turbine model using super-elements CADFEM Germany Various performance improvements / bug corrections on-going: >400 parameters slowing down model ANSYS Dev. use of design points not possible ANSYS Dev. Stator model as a sub-model of full turbine model Rotor model as a sub-model of full turbine model? Bearing and coil laminate assembly as sub-model of full tubine model Idealisation and performance improvements critical Computation times and costs expected to decrease CADFEM 2017 29
Questions? CADFEM 2017 30