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Influence of directional wave spreading on a WEC device

Emilio Faraggiana, John Chapman, Ian Masters Orcid Logo

International Marine Energy Journal, Volume: 5, Issue: 2, Pages: 227 - 242

Swansea University Author: Ian Masters Orcid Logo

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Abstract

Wave Energy Converter (WEC) performance is generally sensitive to the wave direction. So, it is important to include the effect of multi-directional waves in numerical modelling. A realistic representation of ocean waves should account for wave height and directional spreading parameters specific to...

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Published in: International Marine Energy Journal
ISSN: 2631-5548
Published: European Wave and Tidal Energy Conference 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa61812
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first_indexed 2022-11-28T14:33:23Z
last_indexed 2023-01-13T19:22:49Z
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spelling 2022-11-28T14:34:52.1384089 v2 61812 2022-11-08 Influence of directional wave spreading on a WEC device 6fa19551092853928cde0e6d5fac48a1 0000-0001-7667-6670 Ian Masters Ian Masters true false 2022-11-08 MECH Wave Energy Converter (WEC) performance is generally sensitive to the wave direction. So, it is important to include the effect of multi-directional waves in numerical modelling. A realistic representation of ocean waves should account for wave height and directional spreading parameters specific to the WEC deployment location. A high quality generalised directional distribution is dependent on the wave direction and frequency. Here we compare the power produced, the wave field, and the motion of the WaveSub device for different frequency-directional distribution cases. Directional spreading has been modelled using different model distributions such as the uniform cosine fourth, Mitsuyasu, Hasselman and Donelan-Banner. The hydrodynamic coefficients are computed for all wave directions using Nemoh. Then, the WEC-Sim code has been extended to add the capability to simulate different user selected frequency-directional spreading. The excitation force applied to each hydrodynamic body is updated to account for the effect of the directional spectrum. Results show that power produced is generally 10-20% lower than a single direction case. The motion of the device demonstrates the introduction of sway, roll, and yaw for the directional spreading simulations while the resultant wavefield is more uniform compared to the non-directional case. Computational time is significantly lower than comparable CFD approaches and this makes this method particularly effective. Journal Article International Marine Energy Journal 5 2 227 242 European Wave and Tidal Energy Conference 2631-5548 wave energy, directional spreading, Numerical modelling 30 9 2022 2022-09-30 10.36688/imej.5.227-242 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2022-11-28T14:34:52.1384089 2022-11-08T11:27:21.7069872 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Emilio Faraggiana 1 John Chapman 2 Ian Masters 0000-0001-7667-6670 3 61812__25937__e3ae74227bc5434f9d9467693aff4e8b.pdf 61812.pdf 2022-11-28T14:33:37.0630418 Output 1797016 application/pdf Version of Record true This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 licence true eng http://creativecommons.org/licenses/by/4.0/
title Influence of directional wave spreading on a WEC device
spellingShingle Influence of directional wave spreading on a WEC device
Ian Masters
title_short Influence of directional wave spreading on a WEC device
title_full Influence of directional wave spreading on a WEC device
title_fullStr Influence of directional wave spreading on a WEC device
title_full_unstemmed Influence of directional wave spreading on a WEC device
title_sort Influence of directional wave spreading on a WEC device
author_id_str_mv 6fa19551092853928cde0e6d5fac48a1
author_id_fullname_str_mv 6fa19551092853928cde0e6d5fac48a1_***_Ian Masters
author Ian Masters
author2 Emilio Faraggiana
John Chapman
Ian Masters
format Journal article
container_title International Marine Energy Journal
container_volume 5
container_issue 2
container_start_page 227
publishDate 2022
institution Swansea University
issn 2631-5548
doi_str_mv 10.36688/imej.5.227-242
publisher European Wave and Tidal Energy Conference
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str 1
active_str 0
description Wave Energy Converter (WEC) performance is generally sensitive to the wave direction. So, it is important to include the effect of multi-directional waves in numerical modelling. A realistic representation of ocean waves should account for wave height and directional spreading parameters specific to the WEC deployment location. A high quality generalised directional distribution is dependent on the wave direction and frequency. Here we compare the power produced, the wave field, and the motion of the WaveSub device for different frequency-directional distribution cases. Directional spreading has been modelled using different model distributions such as the uniform cosine fourth, Mitsuyasu, Hasselman and Donelan-Banner. The hydrodynamic coefficients are computed for all wave directions using Nemoh. Then, the WEC-Sim code has been extended to add the capability to simulate different user selected frequency-directional spreading. The excitation force applied to each hydrodynamic body is updated to account for the effect of the directional spectrum. Results show that power produced is generally 10-20% lower than a single direction case. The motion of the device demonstrates the introduction of sway, roll, and yaw for the directional spreading simulations while the resultant wavefield is more uniform compared to the non-directional case. Computational time is significantly lower than comparable CFD approaches and this makes this method particularly effective.
published_date 2022-09-30T04:20:55Z
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score 11.011512