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Turbulence generation and its effect in LES approximations of tidal turbines

Turbulence generation and its effect in LES approximations of tidal turbines
Turbulence generation and its effect in LES approximations of tidal turbines
Tidal flows suitable for the installation of tidal stream turbines are highly turbulent with a broad range of turbulent scales, and intensities of around 10%. It is important to understand how turbulent flows affect the performance and wake profiles for the accurate prediction of the performance of single devices and arrays. Previous studies have considered the effects of turbulence intensity, but the effects of turbulent eddy size have not been investigated. This paper presents a new method for generating turbulence in large eddy simulations of uniform actuator disc rotor models. The advantage of the gridded actuator disc is that the generated turbulence may be controlled, so the effects of turbulence length scale and intensity may be investigated. Initial results show the wake recovery is faster behind a rotor generating larger turbulent length scales and intensities, with a corresponding increase in axial induction and thrust. Therefore turbines may be positioned closer together if they generate more turbulence, increasing the power output of an array for a given area, although the individual device performance may be lower. Future work will consider the effects of free-stream turbulence on the performance and wake profiles of the gridded actuator disc, and validation against experimental data.
Blackmore, T.
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Batten, W.M.J.
8a6a68c7-b614-4f62-9d56-54eb38a45a94
Bahaj, A.S.
a64074cc-2b6e-43df-adac-a8437e7f1b37
Blackmore, T.
05087c45-a814-44d8-bac5-1670f9a60abd
Batten, W.M.J.
8a6a68c7-b614-4f62-9d56-54eb38a45a94
Bahaj, A.S.
a64074cc-2b6e-43df-adac-a8437e7f1b37

Blackmore, T., Batten, W.M.J. and Bahaj, A.S. (2013) Turbulence generation and its effect in LES approximations of tidal turbines. 10th European Wave and Tidal Energy Conference, Aalborg, Denmark. 01 - 04 Sep 2013. 9 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Tidal flows suitable for the installation of tidal stream turbines are highly turbulent with a broad range of turbulent scales, and intensities of around 10%. It is important to understand how turbulent flows affect the performance and wake profiles for the accurate prediction of the performance of single devices and arrays. Previous studies have considered the effects of turbulence intensity, but the effects of turbulent eddy size have not been investigated. This paper presents a new method for generating turbulence in large eddy simulations of uniform actuator disc rotor models. The advantage of the gridded actuator disc is that the generated turbulence may be controlled, so the effects of turbulence length scale and intensity may be investigated. Initial results show the wake recovery is faster behind a rotor generating larger turbulent length scales and intensities, with a corresponding increase in axial induction and thrust. Therefore turbines may be positioned closer together if they generate more turbulence, increasing the power output of an array for a given area, although the individual device performance may be lower. Future work will consider the effects of free-stream turbulence on the performance and wake profiles of the gridded actuator disc, and validation against experimental data.

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Blackmore, Batten, Bahaj - 2013 - Turbulence generation and its effect in LES approximations of tidal turbines.pdf - Accepted Manuscript
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More information

Published date: September 2013
Venue - Dates: 10th European Wave and Tidal Energy Conference, Aalborg, Denmark, 2013-09-01 - 2013-09-04
Organisations: Energy & Climate Change Group

Identifiers

Local EPrints ID: 362028
URI: http://eprints.soton.ac.uk/id/eprint/362028
PURE UUID: b3b3c1ee-b921-485f-bf8b-55eab903790d
ORCID for A.S. Bahaj: ORCID iD orcid.org/0000-0002-0043-6045

Catalogue record

Date deposited: 11 Feb 2014 15:22
Last modified: 10 Jul 2020 00:23

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Contributors

Author: T. Blackmore
Author: W.M.J. Batten
Author: A.S. Bahaj ORCID iD

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