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Capturing the Development and Interactions of Wakes in Tidal Turbine Arrays Using a Coupled BEM-DES Model

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Original languageEnglish
Pages (from-to)71-88
JournalOcean Engineering
Volume181
Early online date15 Apr 2019
DOIs
Publication statusPublished - 1 Jun 2019

Abstract

As tidal and hydrokinetic energy systems develop, new tools are needed to assess quantitatively the eects of turbines on the environment and to estimate their performance. When installed in an array, turbine wakes interact, increasing the complexity of the ow and changing their performance. Experimental and numerical approaches have been employed to analyze flows with multiple turbines, but it is not yet clear which level of detail is necessary to represent the flow hydrodynamics and the details of the devices. In numerical approaches, questions remain on the selection of turbulence models and turbine representations, since more realistic but computationally expensive methodologies not necessarily produce an improvement on the understanding of these flows. In this investigation we perform simulations of turbine arrays to study the hydrodynamics of wakes and their interactions, comparing with experiments and previous simulations. We propose a methodology that couples detached-eddy simulations (DES) with Blade Element Momentum (BEM), showing that by capturing the dynamically-rich coherent structures of the flow, we improve the
description of mean quantities and turbine performance. The results show that for downstream turbines, there is an accelerated wake development, increasing the temporal variability of the bed shear stress, and the power and thrust coefficients.

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