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MEDA Model 5 – Bottom-hinged pitching wave energy system design and analysis. Ye Li – NREL Yi- Hsiang Yu– NREL Robert Thresher – NREL MEDA Model Meeting State College, PA August 23-24, 2011. Presentation outline. Background: several developed device concepts. BioWave. WaveRoller.

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MEDA Model 5 – Bottom-hinged pitching wave energy system design and analysis


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    1. MEDA Model 5 – Bottom-hinged pitching wave energy system design and analysis Ye Li – NREL Yi-Hsiang Yu– NREL Robert Thresher – NREL MEDA Model Meeting State College, PA August 23-24, 2011

    2. Presentation outline

    3. Background: several developed device concepts BioWave WaveRoller Oyster

    4. Several design variables need to be considered

    5. Device design *Overview of Large Dimensions • The device design was obtained from Sandia National Lab • Device is attached to the seabed and designed to operate in water depths of 20-25m.

    6. Modeling Plan • Potential code modeling (WAMIT or other BEM code) for basic geometry and thickness designs  • CFD simulations (FVM or SPH) for more detail analysis. • Validation with experimental test • Optimization based on hydrodynamic analysis results

    7. Numerical Settings for CFD Simulation Plate size: Height=10m Thickness=2m Water surface Mean water Depth = 25 m Incident waves: Wave height=4m Wave period=10sec Sponge-layer damping zone Seabed Supporting arm currently was not included in the CFD simulation

    8. Computational Grid • Preliminary computational grid is very coarse (N≈45,000), and a grid refinement study is planned.

    9. Preliminary Result • Wave condition: H=4m; T=10 sec • The top of the flap is 1.25m below the mean water surface.

    10. Smooth Particle Hydrodynamics

    11. Discussions • In the current preliminary design, wave energy may be lost due to the cap between the water surface and the flap.  • To accurately predict and investigate the performance of this type of wave energy device( with extreme wave breaking and overtopping), CFD simulation is needed.  • Experimental test must be conducted in parallel with the numerical method development to ensure the quality of the design