3-Dimensional Numerical Simulation of Flow-Induced Vibration of a Rectangular Cylinder

It is important to predict flow-induced vibration of a bluff body elastically supported in a uniform flow. In this paper, the free oscillation of a rectangular cylinder with two-degree of freedom in the streamwise (in-line) and cross-flow (transverse) dircctions in a uniform flow, has been computced by the LES method at high Reynolds number of 2.2×104. The Smagorinsky model was used as a subgrid scale (SGS) model. The main objectives of this work are to predict and estimate characteristics of flows around a free-ocillating cylinder. The present computations successfully reproduce various types of flow-induced vibrations of a free-oscillating rectangular cylinder which were found by experiments; in-line oscillation, eddy-excitation and low-velocity galloping.