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COBEM 2023
27th International Congress of Mechanical Engineering
STABILITY ANALYSIS OF BOUNDARY LAYER FLOW IN HIGH ASPECT RATIO GAP UNDER BYPASS TRANSITION CONDITIONS.
Submission Author:
Henrique Teixeira , SP , Brazil
Co-Authors:
Henrique Teixeira, Marcello Augusto Faraco de Medeiros, Victor Barcelos Victorino, Felipe Oliveira Aguirre
Presenter: Victor Barcelos Victorino
doi://10.26678/ABCM.COBEM2023.COB2023-2275
Abstract
Boundary layer transition significantly affects aerodynamic drag. Accurately predicting the transition location requires understanding the boundary layer's stability, especially as real aircraft boundary layers often contain surface imperfections such as gaps. This study aims to investigate the influence of high aspect ratio gaps on boundary layer stability near bypass transition conditions reported in the literature. We used a numerical approach via two-dimensional direct numerical simulation to obtain the equilibrium solution of the compressible Navier-Stokes Equations, followed by a stability analysis of the flow to two- and three-dimensional disturbances. Our in-house algorithm, which uses an Arnoldi-based time-stepping method, was employed for linear stability analysis. Our preliminary results revealed unstable oscillation modes for 2D (Rossiter) analysis in the runs immediately following the bypass transition, suggesting a potential relationship between the Rossiter mode and the bypass transition reported in the literature.
Keywords
Boundary Layer, Navier-Stokes Equations, Rossiter modes, bypass transition
