Resolvent modelling of near-wall coherent structures in turbulent channel flow

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Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorInstituto Tecnológico de Aeronáutica-
Autor(es): dc.contributorKTH Royal Institute of Technology-
Autor(es): dc.creatorAbreu, Leandra I. [UNESP]-
Autor(es): dc.creatorCavalieri, André V.G. [UNESP]-
Autor(es): dc.creatorSchlatter, Philipp [UNESP]-
Autor(es): dc.creatorVinuesa, Ricardo [UNESP]-
Autor(es): dc.creatorHenningson, Dan S. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:26:55Z-
Data de disponibilização: dc.date.available2022-02-22T00:26:55Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-10-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.ijheatfluidflow.2020.108662-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/199271-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/199271-
Descrição: dc.descriptionTurbulent channel flow was analysed using direct numerical simulations at friction Reynolds numbers Reτ=180 and 550. The databases were studied using spectral proper orthogonal decomposition (SPOD) to identify dominant near-wall coherent structures, most of which turn out to be streaks and streamwise vortices. Resolvent analysis was used as a theoretical approach to model such structures, as it allows the identification of the optimal forcing and most amplified flow response; the latter may be related to the observed relevant structures obtained by SPOD, especially if the gain between forcing and response is much larger than what is found for suboptimal forcings or if the non-linear forcing is white noise. Results from SPOD and resolvent analysis were compared for several combinations of frequencies and wavenumbers. For both Reynolds numbers, the best agreement between SPOD and resolvent modes was observed for the cases where the lift-up mechanism from resolvent analysis is present, which are also the cases where the optimal resolvent gain is dominant. These results confirm the outcomes in our previous studies (Abreu et al., 2019; Abreu et al., 2020), where we used a DNS database of a pipe flow for the same Reynolds numbers.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionSão Paulo State University (UNESP), Campus of São João da Boa Vista-
Descrição: dc.descriptionDivisão de Engenharia Aeronáutica Instituto Tecnológico de Aeronáutica-
Descrição: dc.descriptionFLOW Engineering Mechanics KTH Royal Institute of Technology-
Descrição: dc.descriptionSão Paulo State University (UNESP), Campus of São João da Boa Vista-
Idioma: dc.languageen-
Relação: dc.relationInternational Journal of Heat and Fluid Flow-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCoherent structures-
Palavras-chave: dc.subjectResolvent analysis-
Palavras-chave: dc.subjectSPOD-
Palavras-chave: dc.subjectWall-bounded turbulence-
Título: dc.titleResolvent modelling of near-wall coherent structures in turbulent channel flow-
Tipo de arquivo: dc.typelivro digital-
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