Recent Research Results in Hydrokinetic technology at Dalhousie University

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1 1 Recent Research Results in Hydrokinetic technology at Dalhousie University M. E. EL-HAWARY, Dalhousie University, Halifax, Nova Scotia, Canada 14PESGM2577, for Presentation at 2014 PES General Meeting, National Harbor, MD, USA, July 31, 2014

2 2 Marine Energy Research Dal Oceanography Electrical and Computer Engineering Mechanical Engineering

3 3 Energy Storage Requirements for a small community Professor Lucas Swan Digby Neck region sites of interest in Nova Scotia

4 Proposed System 4

5 Underwater Power Cables Mo El-Hawary & Aaron MacNeil 1. Line Parameters 2. Model Approximations 3. Steady State Performance 4. Transient Performance 5. Magnetic Field Analysis 6. System Modeling

6 Offshore Generator Interconnection Point to Point Connection Ring Connection Radial Connection Star Connection

7 7 Areas Optimum layout of offshore tidal and wind farms. Power Quality Impact of Tidal convertors. Dynamic Interactions between tidal and wind generation resources.

8 Models of In-stream Tidal Turbines Professor Dominic Groulx N. Osbourne Validated against experimental results Used to analyse wake turbulence and propagation Predictions of turbine loading Can be adapted to realworld flow regimes Helicity (orange) and streamline results on a three bladed horizontal axis tidal turbine (HATT)

9 OceanSonics Hydrophone Model Pressure Fluctuations caused by Turbulent Motions Professor Dominic Groulx The numerical work aims to resolve turbulent motions cause by the hydrophone which adversely effect experimental measurements. ANSYS Fluent is used with an LES CFD model to simulate the flow. The ANSYS meshing tool is used to focus the model s computational grid to the receiver section of the hydrophone. Hydrophone Receiver Mesh

10 Preliminary Numerical Study The Impact of the Hydrophone on the Free Stream Velocity Professor Dominic Groulx Simulating the hydrophone in a numerical representation of the Dalhousie University tow tank allows for a velocity field representation of the turbulent fluctuations caused by the hydrophone. Numerical simulations are performed to match collected experimental data. Numerical results show the complex behaviour of the flow and offer suggestions to improve the hydrophone design. Velocity Field Cross Section

11 Mesh Convergence for LES Ensuring Simulation Accuracy 8 m/s Flow Mesh refinement in LES brings flow field results closer to a DNS. The hydrophone mesh convergence study has shown the importance of small scale turbulent motions on the resulting pressure field. Variations in the pressure field as a result of varying the mesh resolution A correct representation of the pressure field ensures that design corrections are applied when needed.

12 12 Tow Tank Testing Hydrophone tested in Dalhousie tow tank Carriage speeds of 0.5 to 3.5 m/s

13 13 Tow Tank Testing Further testing to be completed with recorded video to characterize flow Using SeaViewer HD-SDI 6000 camera

14 14 Drag and Turbulence in Tidal Flow Professor Alex Hay: Oceanography Motivation Resource assessment TSEC design Main Thrusts Standard Acoustic Doppler Current profilers (ADCPs) Instrument development for turbulence measurement at mid-depth (e.g. at hub height)

15 15 Drag and Turbulence in Tidal Flow Standard ADCPs Velocity profiles, bottom drag (McMillan et al., Proc. EWTec 2013, Aalborg, DK) 2 nd -order turbulence quantities (e.g. TKE etc.) ( Hay et al., Proc. Oceans 2013, San Diego, US)

16 16 Drag and Turbulence in Tidal Flow New Instrumentation Moored sensors for full spectrum turbulence with Rockland Scientific, field-tested in 2013 New large baseline bistatic Doppler system with Nortek Scientific and FORCE, first field tests later this year

17 17 Tidal turbine work Professor Sue Molloy Chris Seaton Completed design and construction of a model vertical axis river/tidal turbine based on the New Energy Corporation 10kW turbine. Plan testing in the Dalhousie Tow Tank in 2014 Model tests will be compared to full scale data made available by NEC.

18 18 Tidal turbine work Completed a series of towing tank tests on a model turbine of the SCHOTTEL STG turbine in SVA Berlin and will be presenting results comparing model and full scale test results at conferences in

19 19 Tidal turbine work Working with Jim Hanlon, CEO of IORE, Craig Chandler of SLR Consulting and Joe Hood of Akoostix on the value of high flow high turbulence test facilities for non MRE applications.

20 20 Tidal turbine work Developing a tidal turbine test facility with Cape Breton University to be unveiled at ICOE 2014 in Halifax, November 4-6.

21 21 Thanks. M E El-Hawary

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