244 Feature Phenomena in Vortex-Induced Vibration of a Spring-Supported Cylinder in a Narrow Channel : Lock-In Phenomena and Caused Offset

Abstract

In this paper, we have addressed the vortex-induced transverse vibration of a spring-supported circular cylinder in a narrow channel. The characteristics of the two-dimensional laminar flow in a narrow channel depend on the oscillations of the cylinder. In experiments using the dynamical similar model, we clarified the effect of channel wall on the lock-in phenomena and we observed, as the spring stiffness becomes weak, a constant component (DC Offset) included in the time history of the cylinder displacement. Furthermore, the experimental results were compared with the numerical results.