Duquesne, P., Jondeau, E. et Sanjosé, M..
2025.
« Dynamics and losses of a short laminar separation bubble ».
In 59th 3AF International Conference on Applied Aerodynamics (AERO) (Strasbourg, France, Mar. 24-26, 2025)
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Résumé
A laminar separation bubble induced by an adverse pressure gradient is characterized using velocity field from Particle Image Velocimetry. The analysis of the velocity field statistics and time series snapshots observations confirm a laminar flow separation, followed by an unsteady turbulent boundary layer reattachment. The transition is initiated by a Kelvin-Helmholtz instability. The transition and reattachment of the separation is also analysed using Proper Orthogonal Decomposition and a decomposition of losses based on the mean kinetic energy equation. The instability generates a vortex at the mean bubble edge when viscous effects are important and Reynolds stresses are low. The vortex is transported along the edge. As the bubble height increases, the cross Reynolds stress and the vortex size increase. Finally, the vortex become sufficiently strong to induce a counter rotating vortex at the wall inside the bubble and the separation bubble break down.
| Type de document: | Compte rendu de conférence |
|---|---|
| Chercheur(-euse): | Chercheur(-euse) Sanjosé, Marlène |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 11 août 2026 15:42 |
| Dernière modification: | 03 sept. 2026 17:29 |
| URI: | https://espace2.etsmtl.ca/id/eprint/34184 |
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