Spontaneous Symmetry Breaking of a Hinged Flapping Filament Generates Lift
Event details
| Date | 27.11.2012 |
| Hour | 14:15 › 15:15 |
| Speaker | Prof. Alessandro Bottaro : http://www.dicat.unige.it/bottaro/index.html |
| Location | |
| Category | Conferences - Seminars |
The behavior of a flexible filament anchored to the rear end of a fixed rigid bluff body is investigated numerically for intermediate Reynolds numbers. For sufficiently short and rigid filaments, asymmetric periodic flapping motion emerges from the intrinsically symmetric dynamics, resulting in net lift force and reduction of mean drag force. We observe that this phenomenon is accompanied to a buckling instability in the recirculation region of the von Karman wake. To sustain compression the short filament creates a vortical structure on one of its sides, which then breaks symmetry and counter-acts the von Karman vortices in the recirculation zone.
Conceptually, this investigation demonstrates that spontaneous symmetry-breaking of a single filament can alter bluff body wakes favorably. The work has been carried out together with Shervin Bagheri (KTH, Stockholm) and Andrea Mazzino (University of Genova).
Conceptually, this investigation demonstrates that spontaneous symmetry-breaking of a single filament can alter bluff body wakes favorably. The work has been carried out together with Shervin Bagheri (KTH, Stockholm) and Andrea Mazzino (University of Genova).
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Practical information
- General public
- Free
Organizer
- IGM
Contact
- Géraldine Palaj