Modelling tidal current turbine wakes using a coupled RANS-BEMT approach as a tool for analysing power capture of arrays of turbines


Turnock, S.R., Phillips, A.B., Banks, Joe and Nicholls-Lee, R.F. (2011) Modelling tidal current turbine wakes using a coupled RANS-BEMT approach as a tool for analysing power capture of arrays of turbines. Ocean Engineering, 38, (11-12), 1300-1307. (doi:10.1016/j.oceaneng.2011.05.018).

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Description/Abstract

The downstream evolution of the wake generated by a rotating tidal energy conversion device influences the performance of the device itself as well as the performance of any downstream device. An improved method is proposed for coupling a blade element momentum theory inner solution for a horizontal axis tidal turbine with an outer domain flow solved using a commercial finite volume computational Fluid Dynamics solver. A mesh sensitivity study is carried out and shows that for wake evolution of distance 10 diameters a high resolution mesh (>10M cells) is required. The importance of swirl is shown in retarding the wake spreading and that the inclusion of a suitable
turbulence intensity term is also required to capture the spread of the near wake. A final section demonstrates the use of such a technique for analysing the energy capture of an array of multiple turbines distributed over 1km2 of seabed. The use of staggered lateral position between longitudinal arrays demonstrates a potential for more effective power capture.

Item Type: Article
ISSNs: 0029-8018 (print)
0029-8018 (electronic)
Related URLs:
Keywords: CFD, tidal turbine array, power capture prediction, wake evoluiton, blade element momentum
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Fluid-Structure Interactions
ePrint ID: 154885
Date Deposited: 26 May 2010 11:29
Last Modified: 14 Apr 2014 10:47
URI: http://eprints.soton.ac.uk/id/eprint/154885

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