PSU Mark
Eberly College of Science Mathematics Department

Meeting Details

For more information about this meeting, contact Mari Royer.

Title:Suppression of Karman Vortex Streets and Vortex Induced Vibrations
Seminar:CCMA Luncheon Seminar
Speaker:Steve Dong, Purdue University
Abstract:
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
Date:10 / 10 / 2008
Time:12:15pm - 01:25pm