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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

Modelling tidal current turbine wakes using a coupled RANS-BEMT approach as a tool for analysing power capture of arrays of turbines
Modelling tidal current turbine wakes using a coupled RANS-BEMT approach as a tool for analysing power capture of arrays of turbines
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.
CFD, tidal turbine array, power capture prediction, wake evoluiton, blade element momentum
0029-8018
1300-1307
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Phillips, A.B.
f565b1da-6881-4e2a-8729-c082b869028f
Banks, J.
3e915107-6d17-4097-8e77-99c40c8c053d
Nicholls-Lee, R.F.
eb65ebff-bdc3-4ea0-8e3d-6f769fc323ed
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Phillips, A.B.
f565b1da-6881-4e2a-8729-c082b869028f
Banks, J.
3e915107-6d17-4097-8e77-99c40c8c053d
Nicholls-Lee, R.F.
eb65ebff-bdc3-4ea0-8e3d-6f769fc323ed

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), 1300-1307. (doi:10.1016/j.oceaneng.2011.05.018).

Record type: Article

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.

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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
ORCID for A.B. Phillips: ORCID iD orcid.org/0000-0003-3234-8506
ORCID for J. Banks: ORCID iD orcid.org/0000-0002-3777-8962

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Date deposited: 26 May 2010 11:29
Last modified: 14 Mar 2024 02:56

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Contributors

Author: S.R. Turnock ORCID iD
Author: A.B. Phillips ORCID iD
Author: J. Banks ORCID iD
Author: R.F. Nicholls-Lee

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