NDLI: Fluid-Structure Interaction Within a Fuel Assembly Subjected to Seismic Excitation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gary, H. Chang Modarres-Sadeghi, Yahya Karazis, Kostas Gary, T. Williams Hatman, Victor Matthews, Brett
Copyright Year	2014
Abstract	The interaction between fuel assemblies during a seismic or loss of coolant accident (LOCA) event is directly associated with safety and reliability issues for all types of nuclear reactors. This study concentrates on the modeling of a single fuel assembly represented by a cylinder subjected to external flow and an external forcing function at the base. The model investigates the response of the fuel assembly using continuum mechanics model. The general behavior of a cylinder supported at both ends and subjected to axial flow is summarized: The cylinder undergoes several flow-induced instabilities as the flow velocity increases. These instabilities start with a pitchfork bifurcation, resulting in the buckling of the cylinder. At higher flow velocities, period-doubling and torus instabilities are observed as well, eventually leading to chaotic oscillations of the cylinder. It is shown that an increased confinement results in lower critical flow velocities for the first point of instability, resulting in buckling at lower flow velocities. The cylinder response to a base excitation is also considered and it is shown that the response amplitude can change depending on the frequency of base excitation.
File Format	PDF
ISBN	9780791846476
DOI	10.1115/IMECE2014-38954
Volume Number	Volume 4A: Dynamics, Vibration, and Control
Conference Proceedings	ASME 2014 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2014-11-14
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Bifurcation Oscillations Fluid structure interaction Fuels Flow (dynamics) Modeling Coolants Continuum mechanics Excitation Manufacturing Nuclear reactors Safety Reliability Buckling Axial flow Cylinders Accidents
Content Type	Text
Resource Type	Article

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