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Effects of the intrinsic three-dimensionalization of laminar separation bubbles on the amplification of external disturbances
(2018-01-01)
The size and behavior of laminar separation bubbles is strongly related to the laminar-to-turbulent transition process that takes place downstream of the separation of the laminar boundary layer. Wind-tunnel experiments ...
The effect of compressibility on the primary global instability of unforced laminar separation bubbles
(2019-12-01)
Laminar separation bubbles present a three-dimensional self-excited instability mechanism which leads to the appearance of spanwise-periodic structures. In incompressible flow, this mechanism was found to become active at ...
On the Secondary Instability of Forced and Unforced Laminar Separation Bubbles
(2015-01-01)
Previous studies demonstrate that the primary instability of laminar separation bubbles (LSB) on a flat-plate in the absence of external forcing is a three-dimensional centrifugal one. This work develops a weakly non-linear ...
Enhancement of disturbance wave amplification due to the intrinsic three-dimensionalisation of laminar separation bubbles
(2019-10-01)
Previous 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 ...
Laminar separation bubbles on the transitional flow around airfoilsBurbujas de separación laminar en flujo en transición alrededor de perfiles aerodinámicos
(Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Secretaría de Investigación y Posgrado, 2022-10-31)
The purpose of this work is to apply the γ-Reθ turbulence model, which is one of the numerical methods of shear stress transport (SST) applicable to transient flow, to examine if it shows the expected laminar separation ...
Self-excited primary and secondary instability of laminar separation bubbles
(2020-01-01)
The self-excited instabilities acting on laminar separation bubbles in the absence of external forcing are studied by means of linear stability analysis and direct numerical simulation. Previous studies demonstrated the ...
Estudo numérico de bolhas de separação laminar em um canal convergente-divergente
(Universidade Estadual Paulista (Unesp), 2022-07-07)
O objetivo principal desse Trabalho de Conclusão de Curso foi o estudo dos efeitos da intensidade
turbulenta em bolhas de separação geradas em um canal convergente-divergente. Para o estudo de tais
efeitos, foi realizada ...
Estudo da amplificação das ondas de perturbação em bolhas de separação
(Universidade Estadual Paulista (Unesp), 2022-03-22)
As bolhas de separação têm o potencial de amplificar perturbações externas, as quais podem variar em ordens de grandeza e resultar em fenômenos não-lineares e transição para turbulência. Este trabalho de conclusão de curso ...