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Turbulence and shear stress around offshore wind turbine pile in tidal currents using particle image velocimetry

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Publication date2009
Host publicationProceedings of Coastal Dynamics 2009: impacts of human activities on dynamic coastal processes
EditorsMasaru Mizuguchi, Shinji Sato
Place of PublicationSingapore
PublisherWorld Scientific Publishing
Number of pages13
ISBN (electronic)9789814466950
ISBN (print)9789814282468
<mark>Original language</mark>English
Event6th International Conference on Coastal Dynamics - Tokyo, Japan
Duration: 7/09/200911/09/2009

Conference

Conference6th International Conference on Coastal Dynamics
Country/TerritoryJapan
Period7/09/0911/09/09

Conference

Conference6th International Conference on Coastal Dynamics
Country/TerritoryJapan
Period7/09/0911/09/09

Abstract

The three-dimensional spatial characteristics of velocity and turbulence of tidal flow around an offshore wind turbine model have been measured using the technique of Particle Image Velocimetry, (PIV). This approach allows for the instantaneous velocity measurement in large volumes of water. This paper presents analysis of velocity and turbulence parameters in the wake flow behind a cylinder for different tidal stages. The wake flow behind a cylinder is highly complex making it difficult to characterise using point measurement techniques in the laboratory, and model numerically. The PIV measurements enabled the derivation of detailed velocity vector maps, turbulence intensities, kinetic energy and Reynolds stresses across the water column. Results showed a clear flow separation zone between reversed and stream-wise flow in the wake, the structure of which depends on flow velocity and water depth.