Enhancement of disturbance wave amplification due to the intrinsic three-dimensionalisation of laminar separation bubbles

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal Fluminense (UFF)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorRodríguez, D.-
Autor(es): dc.creatorGennaro, E. M. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:23:22Z-
Data de disponibilização: dc.date.available2022-02-22T00:23:22Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-10-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1017/aer.2018.115-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198034-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198034-
Descrição: dc.descriptionPrevious studies demonstrated that laminar separation bubbles (LSBs) in the absence of external disturbances or forcing are intrinsically unstable with respect to a three-dimensional instability of centrifugal nature. This instability produces topological modifications of the recirculation region with the introduction of streamwise vorticity in an otherwise purely two-dimensional time-averaged flows. Concurrently, the existence of spanwise inhomogeneities in LSBs have been reported in experiments in which the amplification of convective instability waves dominates the physics. The co-existence of the two instability mechanisms is investigated herein by means of three-dimensional parabolised stability equations. The spanwise waviness of the LSB on account of the primary instability is found to modify the amplification of incoming disturbance waves in the linear regime, resulting in a remarkable enhancement of the amplitude growth and a three-dimensional arrangement of the disturbance waves in the aft portion of the bubble. Present findings suggest that the oblique transition scenario should be expected in LSBs dominated by the convective instability, unless high-amplitude disturbances are imposed.-
Descrição: dc.descriptionLaboratory of Theoretical and Applied Mechanics (LMTA) Graduate Program in Mechanical Engineering (PGMEC) Department of Mechanical Engineering Universidade Federal Fluminense NiteróiRJ-
Descrição: dc.descriptionSão Paulo State University (UNESP) Campus São João da Boa VistaSãn João da Boa VistaSP-
Descrição: dc.descriptionSão Paulo State University (UNESP) Campus São João da Boa VistaSãn João da Boa VistaSP-
Formato: dc.format1492-1507-
Idioma: dc.languageen-
Relação: dc.relationAeronautical Journal-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAerodynamics-
Palavras-chave: dc.subjectFlow Instability-
Palavras-chave: dc.subjectLaminar separation bubbles-
Palavras-chave: dc.subjectLaminar-Turbulent transition-
Palavras-chave: dc.subjectParabolised stability equations-
Título: dc.titleEnhancement of disturbance wave amplification due to the intrinsic three-dimensionalisation of laminar separation bubbles-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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