Kodie-Ampaw, Joseph Kwabena, Bonsi, Adime Kofi et Essel, Ebenezer Ekow.
2025.
« Unsteady wake characteristics of a notchback Ahmed body ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
The unsteady wake dynamics of a notchback Ahmed body with an effective backlight angle of ?e =17.8° is investigated using time-resolved particle image velocimetry (TR-PIV). The study was conducted at a Reynolds number of Reh = 17,000 based on the height of the model and freestream velocity Ue = 0.24 m/s . Velocity field measurements were conducted in two streamwise-wall-normal planes offset from the centerline, VL (left) and VR (right). The results showed an earlier attachment of the separated shear layer from the roof on the deck in VR than in VL, indicating wake asymmetry. Spectral proper orthogonal decomposition (SPOD) of the velocity fluctuations in the slant-deck region identified coherent structures with dominant Strouhal numbers of Sth = 0.92 in VL and Sth = 0.89 in VR. These structures are larger and more energetic over the slant and deck in VL compared to VR. In contrast, the structures on the roof were more prominent in VR, influencing the earlier attachment on the deck. The convective velocity of these structures further demonstrated asymmetry in the downstream evolution.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:15 |
| Dernière modification: | 18 déc. 2025 15:15 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32439 |
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