Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow

We perform numerical simulations to characterize the flow-induced vibrations (FIV) of a rear cavity with elastically hinged rigid plates, placed as a passive device at the base of a blunt body that is subject to a laminar flow of Reynolds number Re = 400 . The dynamic response and forcing of plates,...

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Autores: Jiménez-González, José Ignacio, García-Baena, Carlos, Fernández-Aceituno, Javier, Martínez-Bazán, Carlos
Tipo de recurso: artículo
Estado:Versión borrador
Fecha de publicación:2021
País:España
Institución:Universidad de Jaén
Repositorio:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
OAI Identifier:oai:ruja.ujaen.es:10953/6179
Acceso en línea:https://doi.org/10.1016/j.jsv.2020.115899
https://hdl.handle.net/10953/6179
Access Level:acceso abierto
Palabra clave:Flow induced vibrations
Multibody Dynamics
Bluff body
Passive device
Rear flexible cavity
3310
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spelling Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flowJiménez-González, José IgnacioGarcía-Baena, CarlosFernández-Aceituno, JavierMartínez-Bazán, CarlosFlow induced vibrationsMultibody DynamicsBluff bodyPassive deviceRear flexible cavity3310We perform numerical simulations to characterize the flow-induced vibrations (FIV) of a rear cavity with elastically hinged rigid plates, placed as a passive device at the base of a blunt body that is subject to a laminar flow of Reynolds number Re = 400 . The dynamic response and forcing of plates, wake features and force coefficients are investigated for the range of reduced velocity U ∗= [0 , 30] . Three different regimes of the rotational oscillations are identified. An initial branch of low oscillation amplitude is defined for U ∗< 2 . 5 , where the plates oscillate in counter-phase (varicose mode) with a frequency f p that corresponds to the harmonic of the wake vortex shedding frequency f p 2 f w , and is similar to the nat- ural frequency of the plates, f p f n . For intermediate values of U ∗, the plates oscillate in phase (sinuous mode) at their natural frequency, with respect to a closer averaged location of plates. Such synchronization regime amplifies the vibration magnitude and defines the upper branch in the amplitude response curve, whose maximum is attained at U ∗= 4 . 7 . Due to such enhanced vibration, the vortex shedding frequency is now locked-in at the natural frequency of plates, so that f p = f n = f w . Finally, for larger values of U ∗, a lower branch of moderate amplitude response is defined, which is characterized by the in-phase oscillation of plates, with respect to an more open average position, governed again by the shedding frequency, f p = f w > f n . Additionally, a multibody model has been developed to retrieve, from the plates rotational motion, the resultant forces and moments that produce the plates vibration. Such inverse dynamics model is formulated to allow its generalization for configurations of higher dynamical order, and validated against the results obtained from the numerical simulations. The analysis shows that the synchronization regime is mainly promoted by a reduced fluid damping and a forcing moment that acts in phase with the plates motion. The switch in such phase from 0 ◦to 180 ◦occurs after the lock-in, what attenuates the plates response at large U ∗. In general, the FIV of plates alters the vortex shedding and near wake pressure, especially during the synchronization regime, in- ducing an overall increase of the global force coefficients with respect to the static cavity.ELSEVIER202520252021info:eu-repo/semantics/articleinfo:eu-repo/semantics/draftapplication/pdfhttps://doi.org/10.1016/j.jsv.2020.115899https://hdl.handle.net/10953/6179reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaéninstname:Universidad de JaénInglésJournal of Sound and Vibration [2021]; [495]: [115899]info:eu-repo/semantics/openAccessoai:ruja.ujaen.es:10953/61792026-06-24T12:41:07Z
dc.title.none.fl_str_mv Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
title Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
spellingShingle Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
Jiménez-González, José Ignacio
Flow induced vibrations
Multibody Dynamics
Bluff body
Passive device
Rear flexible cavity
3310
title_short Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
title_full Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
title_fullStr Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
title_full_unstemmed Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
title_sort Flow-induced vibrations of a hinged cavity at the rear of a blunt-based body subject to laminar flow
dc.creator.none.fl_str_mv Jiménez-González, José Ignacio
García-Baena, Carlos
Fernández-Aceituno, Javier
Martínez-Bazán, Carlos
author Jiménez-González, José Ignacio
author_facet Jiménez-González, José Ignacio
García-Baena, Carlos
Fernández-Aceituno, Javier
Martínez-Bazán, Carlos
author_role author
author2 García-Baena, Carlos
Fernández-Aceituno, Javier
Martínez-Bazán, Carlos
author2_role author
author
author
dc.subject.none.fl_str_mv Flow induced vibrations
Multibody Dynamics
Bluff body
Passive device
Rear flexible cavity
3310
topic Flow induced vibrations
Multibody Dynamics
Bluff body
Passive device
Rear flexible cavity
3310
description We perform numerical simulations to characterize the flow-induced vibrations (FIV) of a rear cavity with elastically hinged rigid plates, placed as a passive device at the base of a blunt body that is subject to a laminar flow of Reynolds number Re = 400 . The dynamic response and forcing of plates, wake features and force coefficients are investigated for the range of reduced velocity U ∗= [0 , 30] . Three different regimes of the rotational oscillations are identified. An initial branch of low oscillation amplitude is defined for U ∗< 2 . 5 , where the plates oscillate in counter-phase (varicose mode) with a frequency f p that corresponds to the harmonic of the wake vortex shedding frequency f p 2 f w , and is similar to the nat- ural frequency of the plates, f p f n . For intermediate values of U ∗, the plates oscillate in phase (sinuous mode) at their natural frequency, with respect to a closer averaged location of plates. Such synchronization regime amplifies the vibration magnitude and defines the upper branch in the amplitude response curve, whose maximum is attained at U ∗= 4 . 7 . Due to such enhanced vibration, the vortex shedding frequency is now locked-in at the natural frequency of plates, so that f p = f n = f w . Finally, for larger values of U ∗, a lower branch of moderate amplitude response is defined, which is characterized by the in-phase oscillation of plates, with respect to an more open average position, governed again by the shedding frequency, f p = f w > f n . Additionally, a multibody model has been developed to retrieve, from the plates rotational motion, the resultant forces and moments that produce the plates vibration. Such inverse dynamics model is formulated to allow its generalization for configurations of higher dynamical order, and validated against the results obtained from the numerical simulations. The analysis shows that the synchronization regime is mainly promoted by a reduced fluid damping and a forcing moment that acts in phase with the plates motion. The switch in such phase from 0 ◦to 180 ◦occurs after the lock-in, what attenuates the plates response at large U ∗. In general, the FIV of plates alters the vortex shedding and near wake pressure, especially during the synchronization regime, in- ducing an overall increase of the global force coefficients with respect to the static cavity.
publishDate 2021
dc.date.none.fl_str_mv 2021
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/draft
format article
status_str draft
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.jsv.2020.115899
https://hdl.handle.net/10953/6179
url https://doi.org/10.1016/j.jsv.2020.115899
https://hdl.handle.net/10953/6179
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Sound and Vibration [2021]; [495]: [115899]
dc.rights.none.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:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
instname:Universidad de Jaén
instname_str Universidad de Jaén
reponame_str RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
collection RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
repository.name.fl_str_mv
repository.mail.fl_str_mv
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