For more information about this meeting, contact Mari Royer.
| Title: | Suppression of Karman Vortex Streets and Vortex Induced Vibrations |
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| Seminar: | CCMA Luncheon Seminar |
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| Speaker: | Steve Dong, Purdue University |
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| Abstract: |
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| Vortex shedding from a bluff body is omnipresent in nature and manmade
structures. The asymmetric vortices shed in the bluff-body wake induce
large unsteady side forces which, in turn, can lead to large structural
vibrations if the body is flexibly mounted, especially in the cross-flow
direction. Suppression of the Karman vortex street could reduce such
vortex-induced vibrations and the wake turbulence, with a direct impact on
many real-world applications. In this talk we present an effective
technique for suppressing the vortex-induced vibrations of bluff bodies by
eliminating the Karman vortex street in their wake. Specifically, we find
that small amounts of combined windward suction and leeward blowing around
the body modify the wake instability and lead to suppression of the
fluctuating lift force. Three-dimensional direct numerical simulations and
stability analysis will be used to quantify our findings for the flow past
fixed and flexibly mounted circular cylinders.
Reference:
S. Dong, G.S. Triantafylou, G.E. Karniadakis, "Elimination of vortex
streets in bluff-body flows", Phys. Rev. Lett. 100, 204501, 2008 |
Room Reservation Information
| Room Number: | MB114 |
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| Date: | 10 / 10 / 2008 |
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| Time: | 12:15pm - 01:25pm |
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