NDLI: CFD Estimation of the Flow-Induced Vibrations of a Fuel Rod Downstream a Mixing Grid

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Benhamadouche, S. Moussou, P. Maitre, C. Le
Copyright Year	2009
Abstract	Turbulent-induced vibrations of fuel assemblies in PWR power plants is a potential cause of deformation and of fretting wear damage. Because of the complexity of a 17 × 17 rod assembly with a length exceeding four meters, the prediction of its vibrations is still a challenging task as regards computer simulation. The Large Eddy Simulation (LES) technique provides the instantaneous pressure and velocity fields inside the fluid as well as the shear stress and the pressure along the walls. EDF inhouse open source CFD tool Code_Saturne is used in the present work with a 8 million cells grid to compute the flow along four sub-channels all around one fuel rod by taking into account only one mixing grid. The computations are carried out on 1024 processors of a BlueGene/L supercomputer. Hence, the overall turbulent excitation upon one single rod is estimated numerically, taking into account the specific influence of the deflectors. As regards the structure, using the forces provided by the CFD computation, a linear model of the rod based on Euler beam theory and simplified boundary conditions is proposed. The first natural modes of the structure are hence obtained, and the modal forces are estimated using the standard techniques of modal projection and joint acceptance. Estimations of the vibration amplitude of rod induced by the local flow are finally obtained, using simplified expressions of the added mass and of the damping coefficient. The amplitudes are significant for the first mode essentially, and reach a value of the order of the μm, with a maximum around 6 μm.
Sponsorship	Pressure Vessels and Piping
Starting Page	489
Ending Page	497
Page Count	9
File Format	PDF
ISBN	9780791843673
DOI	10.1115/PVP2009-78054
e-ISBN	9780791838549
Volume Number	Volume 4: Fluid-Structure Interaction
Conference Proceedings	ASME 2009 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2009-07-26
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Damping Turbulence Vibration Deformation Euler-bernoulli beam theory Computational fluid dynamics Computer simulation Fuels Flow (dynamics) Pressure Fuel rods Fluids Large eddy simulation Flow-induced vibrations Computation Wear Shear stress Boundary-value problems Power stations Excitation Manufacturing Damage Pressurized water reactors
Content Type	Text
Resource Type	Article

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