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S21 Vibrações e Análise Modal |
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Title:
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DETERMINATION OF THE VIBRATIONAL CHARACTERISTICS OF NUCLEAR FUEL RODS IN A FLUID FLOW USING MULTIPHYSICS COMPUTATION
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Summary :
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ABSTRACT. THE DETERMINATION OF NATURAL FREQUENCIES AND DISPLACEMENT POWER SPECTRUM DENSITY (PSD) OF FUEL RODS IN A FLUID USING COMPUTATIONAL FLUID DYNAMICS (CFD) AND FINITE ELEMENT METHODS (FEM) IS PRESENTED. THE RODS ARE MODELED AS SLENDER BEAMS SUBJECTED TO SMALL DISPLACEMENTS IN A FLUID USING THREE-DIMENSIONAL MESH. THE INCOMPRESSIBLE NAVIER-STOKES AND LINEAR MOMENTUM BALANCE EQUATIONS ARE SOLVED SIMULTANEOUSLY USING SPECTRUM CODE. TWO EXAMPLES FROM LITERATURE ARE ANALYZED. THE FIRST CONSISTS IN ONE ROD IN A FLUID. THE EXCITATION IS AN IMPULSE FORCE AT THE ROD CENTRAL NODE. THE SECOND EXAMPLE IS A TWO ROD SYSTEM IN A FLUID. IN THIS CASE, THE EXCITATION FORCE IS RANDOM AND IS DETERMINED FROM A PSD.
KEY WORDS: VIBRATIONS, CFD, NUCLEAR FUEL RODS
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Author :
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Sbragio, Ricardo 0
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Paper View :
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