-----------------------------------------------------------

Fluid Dynamics Seminar

Monday, Nov 6, 2006, 4:15 PM
Cullimore Lecture Hall, Room 611
New Jersey Institute of Technology

Vortex-Induced Vibrations by the Immersed Boundary Method

Yongsam Kim

Courant Institute of Mathematical Sciences, New York University

Abstract

The vortex-induced vibration of an elastically constrained circular cylinder has become a benchmark problem in the efforts to understand more general situations of fluid-structure interactions. As the flow speed increases, a (resonance) condition is reached when the vortex formation frequency is close enough to the body's natural frequency such that the unsteady pressures from the wake vortices induce the body to respond. We apply the immersed boundary (IB) method to the vortex-induced vibrations of a 2-D circular cylinder. In order to take into account the effect of mass of the cylinder, the penalty immersed boundary (pIB) method is used. The result of the simulation is quite comparable to the experimental data. We also show some other application problems of the pIB method: 3-D flag, 3-D parachute, and interaction between two fluids with different densities.