| Author(s): |
Victorino, Victor B.
;
Aguirre, Felipe O.
;
de Medeiros, Marcello A. F.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | AIAA AVIATION 2023 FORUM; v. N/A, p. 14-pg., 2023-01-01. |
| Abstract | |
Boundary layer transition significantly affects aircraft performance, demanding a deep knowledge of the process for the development of accurate prediction techniques. Usual aircraft surfaces exhibit irregularities, including gaps. Furthermore, recent studies have shown that gaps can cause bypass transition depending on gap geometry and flow conditions. Therefore, this study aimed to investigate the impact of gaps on boundary layer stability and transition through direct numerical simulation (DNS) of the compressible Navier-Stokes Equations and linear stability analysis to two- and three-dimensional disturbances. The study revealed twoand three-dimensional unstable oscillation modes (Rossiter and centrifugal). Non-linear DNS simulations demonstrated that transition occurred only when the gap flow showed a combination of centrifugal and Rossiter modes with significant growth rates. The numerical results supported the conjecture that the centrifugal instability generates three-dimensional flow over the gap, and the Rossiter mode triggers the transition. Their interaction led to bypass transition, consistent with previous experimental work in the literature. Bypass transition occurred at a remarkably low Reynolds number, and the Mach number was found to push the transition downstream as it increased. (AU) | |
| FAPESP's process: | 13/07375-0 - CeMEAI - Center for Mathematical Sciences Applied to Industry |
| Grantee: | Francisco Louzada Neto |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |