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1 Titelmasterformat durch Klicken bearbeiten Structural Design of Tidal Turbines using ANSYS Workbench Matthieu Morhan, OpenHydro, a Naval Energies Company CADFEM

2 AGENDA Background to OpenHydro Various fields involved in the structural design of a tidal turbine Conclusions and recommendations CADFEM

3 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

4 Who are we and what do we do? CADFEM

5 Who are we and what do we do? 3x 16m turbines deployed in in Canada 2 in France CADFEM

6 Who are we and what do we do? Ultimate goal: Deliver the world s first commercial scale grid-connected tidal arrays CADFEM

7 Who are we and what do we do? CADFEM

8 How do we get to this? CADFEM

9 Environmental conditions ADCP CADFEM

10 Drag Coefficients USE of ANSYS CFX to derive drag coefficients CADFEM

11 Drag Coefficients CADFEM

12 Generator curves CADFEM

13 Design envelopes Rotor Stator CADFEM

14 Component loads Peak Loads Serviceability Loads Fatigue Loads CADFEM

15 High-Performance Computing Typical computation stats using 6 HPCs 10x Professional (5x lease) 2x Premium 1x HPC Workgroup 16 (16 HPCs) CADFEM

16 Full Turbine - Global Deformations CADFEM

17 Full Turbine Load Transfers CADFEM

18 Full Turbine - Bearing system Bearing reactions Bearing pressure CADFEM

19 Full Turbine - Bearing system CADFEM

20 Full Turbine - Bearing system - Tribology Bearing wear measurements Bearing wear analytical model Generation of Stribeck curves CADFEM

21 Full Turbine Modal analysis 1.7Hz mode Lateral sway 5.2Hz mode Ovalisation CADFEM

22 Stator Local stress concentration Equivalent Von-Mises Stress Bolting assessment using beams CADFEM

23 Rotor Global Deformations Mesh Force maps Cyclic symmetry implemented using built-in CPCYC command CADFEM

24 Rotor Ultimate Strength margin DNV-RP-C208 Total Strain Elastic-Plastic material model DNV-RP-C208 CADFEM

25 Fatigue screening CADFEM

26 Lifting assessment CADFEM

27 Buckling RESERVE FACTOR = PREDICTED BUCKLING LOAD FACTORED LOAD Idealised analysis Identification of area of significant minimum principal stress CADFEM

28 Summary Preliminary design Detailed design SPEED LOADS Rotor Stator SSB Combined Model Stator SSB Generator Bearings Workbench CADFEM

29 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

30 Questions? CADFEM