Fluid-Structure Interaction Effects Modeling for the Modal Analysis of a Nuclear Pressure Vessel

[+] Author and Article Information
Jean-François Sigrist

Service Technique et Scientifique,  DCN Propulsion, 44620 La Montagne, Francejean-francois.sigrist@dcn.fr

Daniel Broc

Service d’Etude Mécanique et Sismique,  CEA Saclay, 91191 Gif-Sur-Yvette, France

Christian Lainé

Service Technique et Scientifique,  DCN Propulsion, 44620 La Montagne, France

J. Pressure Vessel Technol 129(1), 1-6 (Mar 17, 2006) (6 pages) doi:10.1115/1.2389025 History: Received October 17, 2005; Revised March 17, 2006

The present paper deals with the modal analysis of a nuclear reactor with fluid-structure interaction effects. The proposed study aims at describing various fluid-structure interaction effects using several numerical approaches. The modeling lies on a classical finite element discretization of the coupled fluid-structure equation, enabling the description of added mass and added stiffness effects. A specific procedure is developed in order to model the presence of internal structures within the nuclear reactor, based on periodical homogenization techniques. The numerical model of the nuclear pressure vessel is developed in a finite element code in which the homogenization method is implemented. The proposed methodology enables a convenient analysis from the engineering point of view and gives an example of the fluid-structure interaction effects, which are expected on an industrial structure. The modal analysis of the nuclear pressure vessel is then performed and highlights of the relative importance of FSI effects for the industrial case are evaluated: the analysis shows that added mass effects and confinement effects are of paramount importance in comparison to added stiffness effects.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Axisymmetric model of the nuclear pressure vessel

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Figure 2

Fluid problem mesh with and without inner structures modeling

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Figure 3

Elementary fluid cell mesh

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Figure 4

Axisymmetric finite element model of the nuclear pressure vessel

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Figure 5

Fluid and structure finites elements, coupling and interface elements

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Figure 6

Uncoupled eigenmode of the reactor (without fluid)

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Figure 7

Coupled eigenmodes of the reactor (with fluid, without inner pressure, without inner structures)

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Figure 8

Stiffness forces from correction terms Kπ and Kσ

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Figure 9

Cumulated modal masses for the coupled eigenmodes calculated with the homogenization technique




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