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Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads

Michael Togneri Orcid Logo, Grégory Pinon, Clément Carlier, Camille Choma Bex, Ian Masters Orcid Logo

Renewable Energy, Volume: 145, Pages: 408 - 418

Swansea University Authors: Michael Togneri Orcid Logo, Ian Masters Orcid Logo

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DOI (Published version): 10.1016/j.renene.2019.05.110

Abstract

Turbulence is a crucial flow phenomenon for tidal energy converters (TECs), as it influences both the peak loads they experience and their fatigue life. To best mitigate its effects we must understand both turbulence itself and how it induces loads on TECs. To that end, this paper presents the resul...

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Published in: Renewable Energy
ISSN: 0960-1481
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa50672
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first_indexed 2019-06-06T14:58:36Z
last_indexed 2020-07-29T19:12:13Z
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spelling 2020-07-29T17:24:12.3642123 v2 50672 2019-06-06 Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads 7032d5a521c181cea18dbb759e1ffdeb 0000-0002-6820-1680 Michael Togneri Michael Togneri true false 6fa19551092853928cde0e6d5fac48a1 0000-0001-7667-6670 Ian Masters Ian Masters true false 2019-06-06 MECH Turbulence is a crucial flow phenomenon for tidal energy converters (TECs), as it influences both the peak loads they experience and their fatigue life. To best mitigate its effects we must understand both turbulence itself and how it induces loads on TECs. To that end, this paper presents the results of blade element momentum theory (BEMT) simulations of flume-scale TEC models subjected to synthetic turbulent flows. Synthetic turbulence methods produce three-dimensional flowfields from limited data, without solving the equations governing fluid motion. These flowfields are non-physical, but match key statistical properties of real turbulence and are much quicker and computationally cheaper to produce. This study employs two synthetic turbulence generation methods: the synthetic eddy method and the spectral Sandia method. The response of the TECs to the synthetic turbulence is predicted using a robust BEMT model, modified from the classical formulation of BEMT. We show that, for the cases investigated, TEC load variability is lower in stall operation than at higher tip speed ratios. The variability of turbine loads has a straightforward relationship to the turbulence intensity of the inflow. Spectral properties of the velocity field are not fully reflected in the spectra of TEC loads. Journal Article Renewable Energy 145 408 418 Elsevier BV 0960-1481 BEMT, SEM, Sandia, Tidal turbines, Turbulence, Simulation 1 1 2020 2020-01-01 10.1016/j.renene.2019.05.110 http://dx.doi.org/10.1016/j.renene.2019.05.110 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2020-07-29T17:24:12.3642123 2019-06-06T10:00:51.0985217 Michael Togneri 0000-0002-6820-1680 1 Grégory Pinon 2 Clément Carlier 3 Camille Choma Bex 4 Ian Masters 0000-0001-7667-6670 5 0050672-06062019100355.pdf togneri2019.pdf 2019-06-06T10:03:55.3070000 Output 8519171 application/pdf Accepted Manuscript true 2020-06-05T00:00:00.0000000 © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ false eng
title Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
spellingShingle Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
Michael Togneri
Ian Masters
title_short Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
title_full Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
title_fullStr Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
title_full_unstemmed Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
title_sort Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads
author_id_str_mv 7032d5a521c181cea18dbb759e1ffdeb
6fa19551092853928cde0e6d5fac48a1
author_id_fullname_str_mv 7032d5a521c181cea18dbb759e1ffdeb_***_Michael Togneri
6fa19551092853928cde0e6d5fac48a1_***_Ian Masters
author Michael Togneri
Ian Masters
author2 Michael Togneri
Grégory Pinon
Clément Carlier
Camille Choma Bex
Ian Masters
format Journal article
container_title Renewable Energy
container_volume 145
container_start_page 408
publishDate 2020
institution Swansea University
issn 0960-1481
doi_str_mv 10.1016/j.renene.2019.05.110
publisher Elsevier BV
url http://dx.doi.org/10.1016/j.renene.2019.05.110
document_store_str 1
active_str 0
description Turbulence is a crucial flow phenomenon for tidal energy converters (TECs), as it influences both the peak loads they experience and their fatigue life. To best mitigate its effects we must understand both turbulence itself and how it induces loads on TECs. To that end, this paper presents the results of blade element momentum theory (BEMT) simulations of flume-scale TEC models subjected to synthetic turbulent flows. Synthetic turbulence methods produce three-dimensional flowfields from limited data, without solving the equations governing fluid motion. These flowfields are non-physical, but match key statistical properties of real turbulence and are much quicker and computationally cheaper to produce. This study employs two synthetic turbulence generation methods: the synthetic eddy method and the spectral Sandia method. The response of the TECs to the synthetic turbulence is predicted using a robust BEMT model, modified from the classical formulation of BEMT. We show that, for the cases investigated, TEC load variability is lower in stall operation than at higher tip speed ratios. The variability of turbine loads has a straightforward relationship to the turbulence intensity of the inflow. Spectral properties of the velocity field are not fully reflected in the spectra of TEC loads.
published_date 2020-01-01T04:02:13Z
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score 11.012678

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