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

Record type: Article

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.

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Citation

Turnock, S.R., Phillips, A.B., Banks, J. 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), pp. 1300-1307. (doi:10.1016/j.oceaneng.2011.05.018).

More information

Submitted date: 9 December 2009
Accepted/In Press date: 18 May 2011
e-pub ahead of print date: 1 July 2011
Published date: August 2011
Keywords: CFD, tidal turbine array, power capture prediction, wake evoluiton, blade element momentum
Organisations: National Oceanography Centre, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 154885
URI: http://eprints.soton.ac.uk/id/eprint/154885
ISSN: 0029-8018
PURE UUID: e1270d50-8750-43cf-ab8c-e160831e6592
ORCID for S.R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 26 May 2010 11:29
Last modified: 18 Jul 2017 12:46

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