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Communication Dans Un Congrès Année : 2009

An evaluation of methods for the time-domain simulation of turbulence excitations for tube bundles subjected to non-uniform flows

Résumé

The present paper addresses the problem of achieving adequate modelling of the turbulence excitations, when performing nonlinear time-domain computations for the predictive dynamical analysis of gapsupported tube bundles of nuclear power-plant components – namely steam generators. Although in most publications the details on time-domain implementations of turbulence excitations are seldom supplied, it is a nontrivial task to provide adequate time-domain force functions which rightly account for the spectral properties, the space correlation, as well as the local magnitude of the flow velocity field. Oversimplified approaches may lead to inadequate modelling of the excitation, and hence to unreliable predictive results. We recently proposed a simple and consistent method to simulate the continuous space-correlated flow force field (Antunes et al, 2008), using a finite set of uncorrelated discrete random forces, which are computed based on the theoretical formulation for the linear modal responses of the excited tube. Here we investigate whether such computationally efficient approach is effective, even when dealing with the nonlinear vibro-impact responses of gap-supported tubes subjected to non-uniform flows. Illustrative linear and nonlinear tube response computations using our simple excitation method are compared with those obtained by modelling the turbulence through a partially correlated random field, computed using the more computationally intensive techniques developed by Shinozuka et al (1971, 1990).
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Dates et versions

hal-04501751 , version 1 (12-03-2024)

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  • HAL Id : hal-04501751 , version 1

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Jose Antunes, Philippe Piteau, Xavier Delaune, Laurent Borsoi. An evaluation of methods for the time-domain simulation of turbulence excitations for tube bundles subjected to non-uniform flows. 20th International Conference on Structural Mechanics in Reactor Technology, August 9-14, 2009, Aug 2009, Espoo, Finland. ⟨hal-04501751⟩

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