Abstract
Coil springs are often used in industrial fields, such as chemical plants or nuclear power plants, in order to suppress structure movements or islolate the structures from undesired vibration. A coil spring can be seen as an assembly of multiple rings, and is often exposed to fluid flow, which will cause vibration of a coil spring and consequent failures. In this study, a part of a coil spring is extracted as a ring and the flow induced vibration of a ring is analyzed. As a first step, a ring is expressed as two circular or elliptic cylinders in tandem subjected to uniform flow. Fluid-structure interaction analyses are conducted by using a CFD software ANSYS, and vortex-induced vibrations are evaluated changing the pitch and aspect ratio of cylinders.
