Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures

Wave overtopping occurring in offshore wind renewable energy structures such as tension leg platforms (TLPs) or semi-submersible platforms is a phenomenon that is worth studying and preventing in order to extend the remaining useful life of the corresponding facilities. The behaviour of this phenome...

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Autores: Esteban Alcalá, Gustavo Adolfo, Ezkurra, Xabier, Bidaguren Diego, Iñigo, Albaina López de Armentia, Iñigo, Izquierdo Ereño, Urko
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/69347
Acceso en línea:http://hdl.handle.net/10810/69347
Access Level:acceso abierto
Palabra clave:wave overtopping
overtopping discharge
cylindrical structure
numerical wave flume
bull-nose
parapet
wave return wall
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spelling Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation StructuresEsteban Alcalá, Gustavo AdolfoEzkurra, XabierBidaguren Diego, IñigoAlbaina López de Armentia, IñigoIzquierdo Ereño, Urkowave overtoppingovertopping dischargecylindrical structurenumerical wave flumebull-noseparapetwave return wallWave overtopping occurring in offshore wind renewable energy structures such as tension leg platforms (TLPs) or semi-submersible platforms is a phenomenon that is worth studying and preventing in order to extend the remaining useful life of the corresponding facilities. The behaviour of this phenomenon has been extensively reported for linear coastal defences like seawalls. However, no referenced study has treated the case of cylindrical structures typical of these applications to a similar extent. The aim of the present study is to define an empirical expression that portrays the relative overtopping rate over a vertical cylinder including a variety of bull-nose type mitigation structures to reduce the overtopping rate in the same fashion as for the linear structures characteristic of shoreline defences. Hydrodynamic interaction was studied by means of an experimentally validated numerical model applied to a non-impulsive regular wave regime and the results were compared with the case of a plain cylinder to evaluate the expected improvement in the overtopping performance. Four different types of parapets were added to the crest of the base cylinder, with different parapet height and horizontal extension, to see the influence of the geometry on the mitigation efficiency. Computational results confirmed the effectivity of the proposed solution in the overtopping reduction, though the singularity of each parapet geometry did not lead to an outstanding difference between the analysed options. Consequently, the resulting overtopping decrease in all the proposed geometries could be modelled by a unique specific Weibull-type function of the relative freeboard, which governed the phenomenon, showing a net reduction in comparison with the cylinder without the geometric modifications. In addition, the relationship between the reduced relative overtopping rate and the mean flow thickness over the vertical cylinder crest was studied as an alternative methodology to assess the potential damage caused by overtopping in real structures without complex volumetric measurements. The collection of computational results was fitted to a useful function, allowing for the definition of the overtopping discharge once the mean flow thickness was known.This work was carried out within the framework of the ITSAS-REM Research Group (IT-1514-22) funded by the Basque Government.MDPI2024202420242024info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/69347reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://www.mdpi.com/2077-1312/12/8/1441info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/es/© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/ 4.0/).oai:addi.ehu.eus:10810/693472026-06-18T09:23:17Z
dc.title.none.fl_str_mv Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
title Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
spellingShingle Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
Esteban Alcalá, Gustavo Adolfo
wave overtopping
overtopping discharge
cylindrical structure
numerical wave flume
bull-nose
parapet
wave return wall
title_short Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
title_full Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
title_fullStr Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
title_full_unstemmed Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
title_sort Computational Study of Overtopping Phenomenon over Cylindrical Structures Including Mitigation Structures
dc.creator.none.fl_str_mv Esteban Alcalá, Gustavo Adolfo
Ezkurra, Xabier
Bidaguren Diego, Iñigo
Albaina López de Armentia, Iñigo
Izquierdo Ereño, Urko
author Esteban Alcalá, Gustavo Adolfo
author_facet Esteban Alcalá, Gustavo Adolfo
Ezkurra, Xabier
Bidaguren Diego, Iñigo
Albaina López de Armentia, Iñigo
Izquierdo Ereño, Urko
author_role author
author2 Ezkurra, Xabier
Bidaguren Diego, Iñigo
Albaina López de Armentia, Iñigo
Izquierdo Ereño, Urko
author2_role author
author
author
author
dc.subject.none.fl_str_mv wave overtopping
overtopping discharge
cylindrical structure
numerical wave flume
bull-nose
parapet
wave return wall
topic wave overtopping
overtopping discharge
cylindrical structure
numerical wave flume
bull-nose
parapet
wave return wall
description Wave overtopping occurring in offshore wind renewable energy structures such as tension leg platforms (TLPs) or semi-submersible platforms is a phenomenon that is worth studying and preventing in order to extend the remaining useful life of the corresponding facilities. The behaviour of this phenomenon has been extensively reported for linear coastal defences like seawalls. However, no referenced study has treated the case of cylindrical structures typical of these applications to a similar extent. The aim of the present study is to define an empirical expression that portrays the relative overtopping rate over a vertical cylinder including a variety of bull-nose type mitigation structures to reduce the overtopping rate in the same fashion as for the linear structures characteristic of shoreline defences. Hydrodynamic interaction was studied by means of an experimentally validated numerical model applied to a non-impulsive regular wave regime and the results were compared with the case of a plain cylinder to evaluate the expected improvement in the overtopping performance. Four different types of parapets were added to the crest of the base cylinder, with different parapet height and horizontal extension, to see the influence of the geometry on the mitigation efficiency. Computational results confirmed the effectivity of the proposed solution in the overtopping reduction, though the singularity of each parapet geometry did not lead to an outstanding difference between the analysed options. Consequently, the resulting overtopping decrease in all the proposed geometries could be modelled by a unique specific Weibull-type function of the relative freeboard, which governed the phenomenon, showing a net reduction in comparison with the cylinder without the geometric modifications. In addition, the relationship between the reduced relative overtopping rate and the mean flow thickness over the vertical cylinder crest was studied as an alternative methodology to assess the potential damage caused by overtopping in real structures without complex volumetric measurements. The collection of computational results was fitted to a useful function, allowing for the definition of the overtopping discharge once the mean flow thickness was known.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/69347
url http://hdl.handle.net/10810/69347
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.mdpi.com/2077-1312/12/8/1441
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/es/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/es/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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