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dc.contributor.authorMalki, R.
dc.contributor.authorMasters, I.
dc.contributor.authorWilliams, A.J.
dc.contributor.authorCroft, T.N.
dc.identifier.citationMalki, R. [et al.]. The variation in wake structure of a tidal stream turbine with flow velocity. A: . CIMNE, 2011, p. 426-437.
dc.description.abstractA combined Blade Element Momentum - Computational Fluid Dynamics (BEM-CFD) model is applied to a 10 m diameter tidal stream turbine blade and the supporting nacelle and tower structure in a 700 m long rectangular channel. The modelling approach is computationally efficient and is suitable for capturing the time-averaged influence of the turbine on the flow. A range of simulations are conducted for the purpose of undertaking a comparative study of the influence of the turbine on mean flow characteristics. Variations in flow structure around the turbine for different flow conditions were evaluated. Simulations are conducted for a range free-stream velocities typical of potential tidal stream deployment sites, typically up to 3.0 m s-1. Velocity deficit profiles and wake dimensions are evaluated for each flow condition implemented. Downstream flow recovery is strongly linked to the flow velocity, and occurs over a longer distance with increasing velocity. For the range of velocities considered, some properties, such as wake length and the maximum wake length location increase linearly, or nearly-linearly with velocity. Other properties, such as the maximum wake width, and the recovery distance downstream demonstrate a tendency to converge towards a constant value. The key findings of this study highlight the significance of the free-stream velocity as an influence on the flow structure around and downstream of a tidal stream turbine.
dc.format.extent12 p.
dc.rightsOpen access
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits
dc.subject.lcshFinite element method
dc.subject.lcshMarine engineering
dc.subject.otherBEM, CFD, tidal stream turbines, wakes.
dc.titleThe variation in wake structure of a tidal stream turbine with flow velocity
dc.typeConference report
dc.subject.lemacEnginyeria naval
dc.rights.accessOpen Access

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