[en] The low-amplitude vibration problem of fuel rods arises from close spacing between rod cluster and the supports of spacer grids. Thus, this vibration behavior in the long term, causing, separates from fretting, high cycle fatigue and stress-corrosion cracking, for instance. Nevertheless, this all too easily and conveniently neglected phenomenon eventually become of major concern as long period systems, such as nuclear fuel. Therefore, the flow-induced vibration of a cylindrical rod in axial flow is studied using fluid-structure interaction (FSI) analysis. This is completely defined a typical fluid-structure coupled problem. Unlikely most of the multi-physics code, the ADINA offers fluid structure interaction capabilities in one single program for the solution of problems where the fluids are fully coupled to general structures that can undergo highly nonlinear response due to large deformations, inelasticity, contact and temperature-dependency. A fully coupled fluid-structure interaction means that the response of the solid is strongly affected by the response of the fluid, and vice versa. The fluid and solid equations are solved individually, in succession, always using the latest information provided by the other part of the coupled system. The iterative FSI coupling solution method requires less memory than the direct FSI coupling method and therefore may be more adequate to solve very large problems. Because, the rod cluster structures with multi-span are composed very large problem, the former analysis scheme is used for this work