Experimental investigation on fluid–structure-coupled dynamic characteristics of the double fuel assemblies in a fast reactor

Lu, Daogang; Ai-guo, Liu; Shang, Chaohao; Dang, junjie; Hong, Yang; Xie, qingyu

doi:10.1016/j.nucengdes.2012.10.013

Cited by 14 publications

(2 citation statements)

References 5 publications

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“…In fact, for narrow gaps, fluid inertia is very high and added mass is much higher than structural mass. As remarked by Daogang et al [4], the damping ratio of the coupled system is proportional to the added damping and inversely proportional to the added mass. Hence, if gap is small enough (as in our case), the added mass effect is dominant on the added damping effect, and the resulting damping ratio in air is higher than in water.…”

Section: In Sargentini Et Al [17]mentioning

confidence: 78%

Added Mass and Damping of an Hexagonal Rod Vibrating in Highly Confined Viscous Fluids

Sargentini

Cariteau

2022

Journal of Pressure Vessel Technology

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This paper deals with fluid-structure interaction analysis of an hexagonal rod enclosed in a narrow viscous gap. A new analytical solution for a 2D cylindrical case is derived and described. A numerical solution of 2D Navier-Stokes equations coupled with an harmonic structure model is applied to both cylindrical and prism geometries. The comparison between the numerical tool and the analytical solution is discussed and a method to apply the analytical solution to the hexagonal case is proposed. An original definition of the added mass and damping based on an energetic approach is provided avoiding the dependence from the geometry and the type of forcing (free or forced vibration). An experimental facility is provided accounting for an hexagonal prism vibrating within a 7 mm enclosure. Free vibration experiments in water allow assessing the added mass and added damping effect on the modal parameters. The fluid flow is affected by a 3D effect - named downstrokes flow - at the top and the base of the assembly because of free surface and stoky geometry. This produces a higher frequency than the 2D theoretical value given both by the analytical solution and the numerical simulation. A geometrybased correction factor is suggested to taken into account in the 2D numerical simulation the 3D effect. Velocity measured within the gap provides further insight on this phenomenon and agrees well with the prediction of the transposed cylindrical analytical model.

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Section: In Sargentini Et Al [17]mentioning

confidence: 78%

Added Mass and Damping of an Hexagonal Rod Vibrating in Highly Confined Viscous Fluids

Sargentini

Cariteau

2022

Journal of Pressure Vessel Technology

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“…Modeling the interaction between a fluid flow and a moving structure is essential in understanding a wide range of physical phenomena. In particular, it addresses problems coming from biology, such as the modeling of the cardiovascular system [1,2], as well as many industrial problems coming, for instance, from aeronautics [3,4] or nuclear industry [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Computationally Efficient Dynamic Grid Motion Approach for Arbitrary Lagrange–Euler Simulations

Leprevost,

Faucher,

Puscas

2023

Fluids

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The present article addresses the topic of grid motion computation in Arbitrary Lagrange–Euler (ALE) simulations, where a fluid mesh must be updated to follow the displacements of Lagrangian boundaries. A widespread practice is to deduce the motion for the internal mesh nodes from a parabolic equation, such as the harmonic equation, introducing an extra computational cost to the fluid solver. An alternative strategy is proposed to minimize that cost by changing from the parabolic equation to a hyperbolic equation, implementing an additional time derivative term allowing an explicit solution of the grid motion problem. A fictitious dynamic problem is thus obtained for the grid, with dedicated material parameters to be carefully chosen to enhance the computational efficiency and preserve the mesh quality and the accuracy of the physical problem solution. After reminding the basics of the ALE expression of the Navier–Stokes equations and describing the proposed hyperbolic equation for the grid motion problem, the paper provides the necessary characterization of the influence of the fictitious grid parameters and the analysis of the robustness of the new approach compared to the harmonic reference equation on a significant 2D test case. A 3D test case is finally extensively studied in terms of computational performance to highlight and discuss the benefits of the hyperbolic equation for ALE grid motion.

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A note on added mass of a group of sections in confined fluid: a general conclusion

Zhang

Wang

et al. 2021

Arch Appl Mech

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Experimental investigation on fluid–structure-coupled dynamic characteristics of the double fuel assemblies in a fast reactor

Cited by 14 publications

References 5 publications

Added Mass and Damping of an Hexagonal Rod Vibrating in Highly Confined Viscous Fluids

Added Mass and Damping of an Hexagonal Rod Vibrating in Highly Confined Viscous Fluids

A Computationally Efficient Dynamic Grid Motion Approach for Arbitrary Lagrange–Euler Simulations

A note on added mass of a group of sections in confined fluid: a general conclusion

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