Abstract
The structural behavior of the nuclear rod bundles that consisted of cylindrical beams was predicted using the spectral element method (SEM) while considering the interaction with the surrounding fluid. Viscous fluid behavior was utilized in order to calculate the forces acting on the nuclear rod bundles from the incident pressure waves. The added mass and fluid coupling on the nuclear rod bundles were determined for the position patterns and gaps of each of the cylindrical beams. The pressure field from propagating waves in the surrounding fluid was calculated with respect to the boundary conditions of the surface of the vibrating structures. With the increasing number of nuclear rods and decreasing pressure wavelengths, the structural vibration of the nuclear rod bundles that were induced by the propagating forces affected the scattering events of the pressure field. The frequency response of the nuclear rod bundles from the pressure waves in the water exhibited smaller damping, because the incident pressure wave travels without fluid coupling due to the longer wavelength when compared with distance between rods. The proposed numerical method can be utilized for the detailed design for effective parameters of a supporting system to reduce the vibration of nuclear fuel rod bundles for safety control.
Highlights
The structural instability that was induced by pressure pulsation and external force in nuclear power reactors, fuel pumps, air conditioning systems, and heat exchanger tubes has received increasing attention in recent years [1,2,3,4,5,6]
The structural vibration of nuclear rod bundles that are induced by propagating pressure waves was simulated by using spectral element method (SEM)
The external forces that were caused by the incident wave and scattering pressure fields were predicted from the solution of the acoustic wave equation
Summary
The structural instability that was induced by pressure pulsation and external force in nuclear power reactors, fuel pumps, air conditioning systems, and heat exchanger tubes has received increasing attention in recent years [1,2,3,4,5,6]. The development of a new numerical method for calculating the vibration of nuclear rod bundles in viscous fluid for the design of support systems is necessary. This study simulated the flexural vibration of the nuclear rod bundles interacting with viscous fluid using SEM based on the wave approach. The development of a new numerical method for calculating ofthe vibration of nuclear rod bundles in viscous fluid for the design of support systems is necessary. The flexural vibration of the single nuclear rod induced by point force was simulated and the transient decay of displacement was confirmed in order to investigate the viscous damping of the surrounding fluid.
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