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Turbulence: Best Practice for the Tidal Power Industry. Part 2: Data processing and characterisation of turbulent flows.

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The Turbulence in the Marine Environment (TiME) project, for the Carbon Trust, part-funded by the Scottish Government has delivered “Turbulence: Best Practices for the Tidal Power Industry” in three documents: 1. Measurement of turbulent flows 2. Data processing and characterisation of turbulent flows 3. Turbulence and turbulent effects in turbine and array engineering The project mapped the effects that marine turbulence has on tidal power installations and demonstrated a practical and efficient end-to-end process for measuring, characterising and simulating the effect of site-specific turbulence. Assessment of the impact of turbulence on engineering design considerations highlighted the importance of properly accounting for it – especially in considering yield and fatigue lifetimes. Part 2, Data processing and characterisation of turbulent flows, provides: • a theoretical and practical basis for the characterisation of turbulence with a dramatically reduced set of parameters. • an evaluation of the theoretical and practical problems with turbulence analysis and techniques which can be used to address them. Its recommendations include: • full characterisation should include mean velocity and Reynolds stress profiles, varying as time series throughout the lunar cycle, at a turbine location. Additional consideration of coherency is strongly recommended. • to overcome problems with maximal accuracy and robustness, measurement data should be tightly integrated with a physical model of the marine boundary layer. The project team demonstrated that full characterisation of the flow, sufficient for determination of yield and fatigue loading as well as other effects, is possible and has been achieved for multiple locations at tidal energy development sites. The project team comprised Partrac (measurement); ABPmer (resource characterisation); Ocean Array Systems (turbulence characterisation and hydrodynamic analyses) and IT Power (device design and performance, array modelling).



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analysis / testing / R&D, data, methodology, turbulence, modelling, velocity, Document, Scottish Government, construction / installation, feasibility, maintenance, operation, tidal, array, construction, engineering, fabrication, fatigue, testing, turbine

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