Flow-induced motions of flexible filaments hanging in cross-flow
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.8/8548 |
Resumo: | Experiments were carried out to study the dynamics of hanging cantilever flexible filaments in air cross-flow. Thirteen flexible filaments of 0.61 mm diameter and lengths from 20 mm to 60 mm were tested with wind speeds in the range of 1–15 m/s, corresponding to Reynolds numbers of 25 < Red < 610 and reduced velocities in the range of 5 < U∗ < 130. Two synchronized fast-imaging cameras were used to reconstruct the motion of the filaments in three dimensions, and a blend of linear and nonlinear time-series analysis techniques was used to analyze the observed dynamics. Long filaments show a rich dynamics as the wind speed is gradually increased, ranging from small amplitude vibration to large amplitude limit-cycle oscillation and to a more complex chaotic motion. However, short filaments only exhibit a small amplitude vibration-like motion throughout the range of wind speeds tested. Turbulent buffeting is identified as the main source of excitation responsible for the observed filaments dynamics. The results highlight the importance of the filament damping ratio, which is modulated by the filament length, as a controlling parameter for the dynamics of flexible filaments in cross flow, in addition to the flow velocity. The Scruton number for these tests correspond to 31 < Sc < 86. |
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Flow-induced motions of flexible filaments hanging in cross-flowLimit-cycle oscillationTurbulence buffetingTurbulence-induced vibrationFilamentFlexible fluid–structure interactionExperiments were carried out to study the dynamics of hanging cantilever flexible filaments in air cross-flow. Thirteen flexible filaments of 0.61 mm diameter and lengths from 20 mm to 60 mm were tested with wind speeds in the range of 1–15 m/s, corresponding to Reynolds numbers of 25 < Red < 610 and reduced velocities in the range of 5 < U∗ < 130. Two synchronized fast-imaging cameras were used to reconstruct the motion of the filaments in three dimensions, and a blend of linear and nonlinear time-series analysis techniques was used to analyze the observed dynamics. Long filaments show a rich dynamics as the wind speed is gradually increased, ranging from small amplitude vibration to large amplitude limit-cycle oscillation and to a more complex chaotic motion. However, short filaments only exhibit a small amplitude vibration-like motion throughout the range of wind speeds tested. Turbulent buffeting is identified as the main source of excitation responsible for the observed filaments dynamics. The results highlight the importance of the filament damping ratio, which is modulated by the filament length, as a controlling parameter for the dynamics of flexible filaments in cross flow, in addition to the flow velocity. The Scruton number for these tests correspond to 31 < Sc < 86.ElsevierIC-OnlineSilva-Leon, JorgeCioncolini, AndreaFilippone, AntonioDomingos, Marco2023-05-31T13:40:30Z2018-04-272018-04-27T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.8/8548engJorge Silva-Leon, Andrea Cioncolini, Antonio Filippone, Marco Domingos, Flow-induced motions of flexible filaments hanging in cross-flow, Experimental Thermal and Fluid Science, Volume 97, 2018, Pages 254-269, ISSN 0894-1777, https://doi.org/10.1016/j.expthermflusci.2018.04.0231879-228610.1016/j.expthermflusci.2018.04.023info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-17T15:57:34Zoai:iconline.ipleiria.pt:10400.8/8548Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:51:14.620138Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Flow-induced motions of flexible filaments hanging in cross-flow |
title |
Flow-induced motions of flexible filaments hanging in cross-flow |
spellingShingle |
Flow-induced motions of flexible filaments hanging in cross-flow Silva-Leon, Jorge Limit-cycle oscillation Turbulence buffeting Turbulence-induced vibration Filament Flexible fluid–structure interaction |
title_short |
Flow-induced motions of flexible filaments hanging in cross-flow |
title_full |
Flow-induced motions of flexible filaments hanging in cross-flow |
title_fullStr |
Flow-induced motions of flexible filaments hanging in cross-flow |
title_full_unstemmed |
Flow-induced motions of flexible filaments hanging in cross-flow |
title_sort |
Flow-induced motions of flexible filaments hanging in cross-flow |
author |
Silva-Leon, Jorge |
author_facet |
Silva-Leon, Jorge Cioncolini, Andrea Filippone, Antonio Domingos, Marco |
author_role |
author |
author2 |
Cioncolini, Andrea Filippone, Antonio Domingos, Marco |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
IC-Online |
dc.contributor.author.fl_str_mv |
Silva-Leon, Jorge Cioncolini, Andrea Filippone, Antonio Domingos, Marco |
dc.subject.por.fl_str_mv |
Limit-cycle oscillation Turbulence buffeting Turbulence-induced vibration Filament Flexible fluid–structure interaction |
topic |
Limit-cycle oscillation Turbulence buffeting Turbulence-induced vibration Filament Flexible fluid–structure interaction |
description |
Experiments were carried out to study the dynamics of hanging cantilever flexible filaments in air cross-flow. Thirteen flexible filaments of 0.61 mm diameter and lengths from 20 mm to 60 mm were tested with wind speeds in the range of 1–15 m/s, corresponding to Reynolds numbers of 25 < Red < 610 and reduced velocities in the range of 5 < U∗ < 130. Two synchronized fast-imaging cameras were used to reconstruct the motion of the filaments in three dimensions, and a blend of linear and nonlinear time-series analysis techniques was used to analyze the observed dynamics. Long filaments show a rich dynamics as the wind speed is gradually increased, ranging from small amplitude vibration to large amplitude limit-cycle oscillation and to a more complex chaotic motion. However, short filaments only exhibit a small amplitude vibration-like motion throughout the range of wind speeds tested. Turbulent buffeting is identified as the main source of excitation responsible for the observed filaments dynamics. The results highlight the importance of the filament damping ratio, which is modulated by the filament length, as a controlling parameter for the dynamics of flexible filaments in cross flow, in addition to the flow velocity. The Scruton number for these tests correspond to 31 < Sc < 86. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-04-27 2018-04-27T00:00:00Z 2023-05-31T13:40:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.8/8548 |
url |
http://hdl.handle.net/10400.8/8548 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Jorge Silva-Leon, Andrea Cioncolini, Antonio Filippone, Marco Domingos, Flow-induced motions of flexible filaments hanging in cross-flow, Experimental Thermal and Fluid Science, Volume 97, 2018, Pages 254-269, ISSN 0894-1777, https://doi.org/10.1016/j.expthermflusci.2018.04.023 1879-2286 10.1016/j.expthermflusci.2018.04.023 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137004333563904 |