Lock-in Phenomenon in Oscillation of a Circular Cylinder Subject to a Uniform Flow

J. Ocean Eng. Technol. 1993;7(1):114-123.

원주의 진동과 칼만 와유출의 동기현상

배헌민,김인철

부산수산대학교 공과대학선박공학과,부산수산대학교 공과대학선박공학과

Keywords: Unsteady Flow, fluid Vibration, Numerical Analysis, Moving Boundary Problem, Karman Vortex Street, Lock-in Phenomenon, Hysteresis Phenomenon

핵심용어: 비정상류, 유체 유기진동, 수치해석, 이동경계문제, 양력계수, 동기현상

Abstract

In is well known that a cyclic Karman vortex street is thrown out periodically from cylinder whose axis is vertical to the bulk flow. When the cylinder is vibrating in the frequency close to that of Karman vortex street, the vortex shedding frequency is locked onto that of cylinder. While there are many experimental studies for this phenomenon compared with analytical studies by numerical calculation, are very limited. In this study, a new algorithm for moving boundary is proposed and a simulator is develoed, which can deal with this phenomenon with experimental studies.