Modelling Pressurized Water Reactor cores in terms of porous media

Ricciardi, Guillaume; Bellizzi, Sergio; Collard, Bruno; Cochelin, Bruno

doi:10.1016/j.jfluidstructs.2008.04.002

Cited by 35 publications

(21 citation statements)

References 29 publications

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“…When the flow rate increases, the slope of the force displacement plot also increases, meaning that the flow induces an added sti↵ness on the fuel assembly (Figure 6b). This added sti↵ness phenomenon is already known in literature and confirmed by experiments (Ricciardi et al, 2009;Ricciardi, 2016Ricciardi, , 2018. The increasing of the temperature water seems, on the other hand, to have an opposite e↵ect (Figure 6c).…”

Section: Quasi-static Analysissupporting

confidence: 85%

Experimental study of fluid structure interaction on fuel assemblies on the ICARE experimental facility

Capanna

Ricciardi

Sarrouy

et al. 2019

Nuclear Engineering and Design

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Accurate knowledge of the mechanical behaviour of the reactor core is needed to estimate the e↵ects of a seismic excitation on a nuclear power plant. Experimental works are needed in order to validate models and to have a better understanding of involved phenomena. The fuel assemblies, in the reactor core, are subjected to an axial water flow which modifies their dynamical behaviour. In this framework a new experimental facility, ICARE, is designed in order to investigate fluid structure interaction phenomena on half scale fuel assemblies. The design of the ICARE experimental facility allows to emphasise the e↵ects of the coupling between di↵erent fuel assemblies due to the presence of the water flow. In this paper a brief review of previous experimental facilities is presented and the new ICARE experimental facility is illustrated. ICARE facility consists in 4 half scale fuel assemblies (2 ⇥ 2 lattice) in a vertical channel submitted to axial flow; one of the assemblies is excited by an hydraulic jack. The aim of this paper is to discuss the experimental results obtained during four experimental campaigns on the ICARE setup. First, the mechanical behaviour of a single fuel assembly is analysed, and the e↵ect of di↵erent experimental parameters is assessed. Added mass, added damping and added sti↵ness e↵ects due to the water flow are estimated. Later, the coupling between di↵erent assemblies is investigated. The presence of the flow induces hydrodynamic e↵ects on non excited fuel assemblies, both on excitation direction and transversal one. Furthermore the increase of the water flow causes the increase of the coupling forces and gives rise to a static coupling between the assemblies.

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Section: Quasi-static Analysissupporting

confidence: 85%

Experimental study of fluid structure interaction on fuel assemblies on the ICARE experimental facility

Capanna

Ricciardi

Sarrouy

et al. 2019

Nuclear Engineering and Design

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“…Assumptions H3 and H4 make integrals over A s ( x , y , z ) vanish. It is also shown in Reference 14 that:

ρ \frac{1}{{V_{Ω}}_{t}} \int_{Ω_{f} (x, y, z)} \frac{\partial u}{\partial t} \cdot \nabla v d Ω = ρ \frac{1}{{V_{Ω}}_{t}} \frac{\partial u}{\partial t} \cdot \nabla \int_{Ω_{f} (x, y, z)} v d Ω,

and:

ρ \frac{1}{{V_{Ω}}_{t}} \int_{A_{t} (x, y, z)} v n \cdot {v_{A}}_{t} d S = ρ \frac{1}{{V_{Ω}}_{t}} \frac{\partial u}{\partial t} \cdot \nabla \int_{Ω_{f} (x, y, z)} v d Ω - ρ \frac{1}{{V_{Ω}}_{t}} \int_{Ω_{f} (x, y, z)} v d Ω \cdot \nabla \frac{\partial u}{\partial t} .

…”

Section: Description Of the Porous Approach For Pwr Fuel Assembly Undmentioning

confidence: 88%

“…In this section the model developed in References 14,15,22 is recalled. The aforementioned porous approach gives access to an equivalent fluid model and an equivalent structure model both defined on the whole domain.…”

Section: Description Of the Porous Approach For Pwr Fuel Assembly Undmentioning

confidence: 99%

“…The porosity

ϕ

is thus assumed to be constant everywhere in the model. This has been discussed in Reference 14, since it is fully implied by the proposed hypothesis inside the fuel assemblies but is an approximation for the fluid spaces between assemblies and between assemblies and surrounding walls. The specific modeling of these fluid spaces of very small volume compared with the rest of the porous domain, and currently named bypasses , is part of an ongoing work out of the scope of the current article, but this topic is addressed in Section 3.2.4 when dealing with the need for approximate lateral boundary conditions that it implies close to a wall, and the validity of the approximation is demonstrated by comparison to representative experiments in Section 4.…”

Section: Description Of the Porous Approach For Pwr Fuel Assembly Undmentioning

confidence: 99%

“…A more complex expression of these fluid forces is given in Reference 13 in which the velocity and the relative direction of the flow with respect to the fuel assembly are accounted for. References 14,15 proposed a porous media approach based on the Païdoussis theory. Experiments involving one fuel assembly on a shaking table with index matching PIV (particle image velocimetry) showed that the structure and the flow are indeed closely related (see References 16,17).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical implementation and validation of a porous approach for fluid–structure interaction applied to pressurized water reactors fuel assemblies under axial water flow and dynamic excitation

Faucher

Ricciardi

Boccaccio

et al. 2021

Numerical Meth Engineering

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The proposed contribution is dedicated to numerical methods for solving strongly coupled fluid–structure dynamic problems where the complexity of the structures and the reduced remaining fluid volume do not allow to handle their exact geometry. Porous approaches are preferred instead but it is mandatory to go beyond classical techniques to account for inertial and convective components of the flow, as explicitly required by the application of the methods to the dynamics of a set of pressurized water reactors fuel assemblies under axial flow and seismic‐like loading. A new computational framework is thus introduced with special care given to stability, robustness, and computational efficiency of the coupled solver. Comparisons with well‐chosen experimental results provide some valuable validation of the numerical methods and demonstrate the ability of the model to reproduce the hydraulic coupling between several fuel assemblies.

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Clustered Cylinders in Axial Flow

Paı̈doussis

2016

Fluid-Structure Interactions

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Modelling Pressurized Water Reactor cores in terms of porous media

Cited by 35 publications

References 29 publications

Experimental study of fluid structure interaction on fuel assemblies on the ICARE experimental facility

Experimental study of fluid structure interaction on fuel assemblies on the ICARE experimental facility

Numerical implementation and validation of a porous approach for fluid–structure interaction applied to pressurized water reactors fuel assemblies under axial water flow and dynamic excitation

Clustered Cylinders in Axial Flow

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