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An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines / Matthew Edmunds; Alison Williams; Ian Masters; Nick Croft

Renewable Energy, Volume: 101, Pages: 67 - 81

Swansea University Authors: Matthew, Edmunds, Alison, Williams, Ian, Masters, Nick, Croft

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Abstract

Simulating fully resolved Horizontal Axis Tidal Turbine (HATT) geometry for a time period great enough to resolve a fully developed wake, and accurately predict power and thrust characteristics, is computationally very expensive. The BEM-CFD method is an enhanced actuator disk and is able to reduce...

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Published in: Renewable Energy
ISSN: 0960-1481
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa29491
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spelling 2021-01-14T12:50:54.4850210 v2 29491 2016-08-08 An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines 3a5a9c64786ffb47f970ef5a5ae02659 Matthew Edmunds Matthew Edmunds true false cb1b1946eccac3bbf7592d6ab1c4d065 0000-0002-2494-1468 Alison Williams Alison Williams true false 6fa19551092853928cde0e6d5fac48a1 0000-0001-7667-6670 Ian Masters Ian Masters true false 8f82cd0b51f4b95b0dd6fa89427d9fc7 0000-0002-1521-5261 Nick Croft Nick Croft true false 2016-08-08 EEN Simulating fully resolved Horizontal Axis Tidal Turbine (HATT) geometry for a time period great enough to resolve a fully developed wake, and accurately predict power and thrust characteristics, is computationally very expensive. The BEM-CFD method is an enhanced actuator disk and is able to reduce the computational cost by simulating a time averaged downstream velocity field. Current implementations fall short of accurately determining tip losses, which are a function of the hydrofoil geometry. This work proposes a method of addressing this shortfall by modifying the angle of attack to conform to the constraints outlined in Prandtl's lifting line theory, i.e. the zero lift angle of attack at the hydrofoil tip. The revised model is compared to existing BEM-CFD methods and validated against experimental data. The revised BEM-CFD method presented in this work shows a significant improvement over previous BEM-CFD methods when predicting power and thrust. The coefficient of power is reduced from 0.57 (approx. 30% above experiment) to 0.44 (approx. 3% above experiment). An increase in turbulence intensity in the rotor region, in particular at the wake boundary, improves the recovery of the wake without the addition of empirical turbulence source terms. Good correlation with experimental results for power, thrust and wake prediction, is observed. The model may also be applied to wind turbines. Journal Article Renewable Energy 101 67 81 0960-1481 Finite volume; Fluid-structure interaction; Hydrodynamics; Incompressible flow; Marine hydrodynamics; Turbulent flow 1 2 2017 2017-02-01 10.1016/j.renene.2016.08.007 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University RCUK, EP/M014738/1 2021-01-14T12:50:54.4850210 2016-08-08T08:56:45.7005525 Matthew Edmunds 1 Alison Williams 0000-0002-2494-1468 2 Ian Masters 0000-0001-7667-6670 3 Nick Croft 0000-0002-1521-5261 4 0029491-30082016083811.pdf edmunds2016v9.pdf 2016-08-30T08:38:11.2730000 Output 3412634 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng
title An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
spellingShingle An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
Matthew, Edmunds
Alison, Williams
Ian, Masters
Nick, Croft
title_short An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
title_full An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
title_fullStr An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
title_full_unstemmed An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
title_sort An enhanced disk averaged CFD model for the simulation of horizontal axis tidal turbines
author_id_str_mv 3a5a9c64786ffb47f970ef5a5ae02659
cb1b1946eccac3bbf7592d6ab1c4d065
6fa19551092853928cde0e6d5fac48a1
8f82cd0b51f4b95b0dd6fa89427d9fc7
author_id_fullname_str_mv 3a5a9c64786ffb47f970ef5a5ae02659_***_Matthew, Edmunds
cb1b1946eccac3bbf7592d6ab1c4d065_***_Alison, Williams
6fa19551092853928cde0e6d5fac48a1_***_Ian, Masters
8f82cd0b51f4b95b0dd6fa89427d9fc7_***_Nick, Croft
author Matthew, Edmunds
Alison, Williams
Ian, Masters
Nick, Croft
author2 Matthew Edmunds
Alison Williams
Ian Masters
Nick Croft
format Journal article
container_title Renewable Energy
container_volume 101
container_start_page 67
publishDate 2017
institution Swansea University
issn 0960-1481
doi_str_mv 10.1016/j.renene.2016.08.007
document_store_str 1
active_str 0
description Simulating fully resolved Horizontal Axis Tidal Turbine (HATT) geometry for a time period great enough to resolve a fully developed wake, and accurately predict power and thrust characteristics, is computationally very expensive. The BEM-CFD method is an enhanced actuator disk and is able to reduce the computational cost by simulating a time averaged downstream velocity field. Current implementations fall short of accurately determining tip losses, which are a function of the hydrofoil geometry. This work proposes a method of addressing this shortfall by modifying the angle of attack to conform to the constraints outlined in Prandtl's lifting line theory, i.e. the zero lift angle of attack at the hydrofoil tip. The revised model is compared to existing BEM-CFD methods and validated against experimental data. The revised BEM-CFD method presented in this work shows a significant improvement over previous BEM-CFD methods when predicting power and thrust. The coefficient of power is reduced from 0.57 (approx. 30% above experiment) to 0.44 (approx. 3% above experiment). An increase in turbulence intensity in the rotor region, in particular at the wake boundary, improves the recovery of the wake without the addition of empirical turbulence source terms. Good correlation with experimental results for power, thrust and wake prediction, is observed. The model may also be applied to wind turbines.
published_date 2017-02-01T03:51:26Z
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