Cylinders in Axial Flow II

Paı̈doussis, M.P.

doi:10.1016/b978-0-12-397333-7.00003-6

Cited by 2 publications

(3 citation statements)

References 55 publications

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“…Further increase in flow velocity causes the rod to deflect to one side with small-amplitude random vibration while remaining in the deflected position. Note that, similar dynamic motions have been observed in various configurations, encompassing both cross and axial flows, for both high-stiffness and flexible rods, and in systems where the rod is either clamped at both ends or configured as a cantilever [17,46,47].…”

Section: Free-fixed Configurationsupporting

confidence: 59%

URANS simulation and experimental validation of axial flow-induced vibrations on a blunt-end cantilever rod for nuclear applications

Pauzi,

Iacovides,

Cioncolini

et al. 2024

Preprint

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Fretting wear caused by flow-induced vibration is a leading cause of fuel failure in light water nuclear reactors. This study describes a numerical methodology, validated with dedicated experiments, for predicting flow-induced vibrations in cantilever rods exposed to axial water flow, a paradigmatic configuration informative for fuel rods in water-cooled nuclear reactor cores. Utilising strong two-way fluid-structure interaction (FSI) simulations with an efficient computational approach, the study focuses on two key aspects of self-excited FIV: the dominant vibration frequency and the amplitude of the vibration. The former depends on optimising the solid domain and FSI coupling, while the latter hinges on the fluid solver’s ability to accurately replicate unsteady flow behaviour, especially in areas of flow separation. Various URANS turbulence models and divergence numerical schemes were evaluated for their capacity to reproduce the correct unsteady flow behaviour. When the axial flow is directed from the free-end to the fixed-end of the rod, both the Eddy Viscosity Model (EVM) k-ω SST and the Reynolds Stress Model (RSM) by Launder, Reece, and Rodi (LRR) reliably predicted the frequency and amplitude of vibrations for a Reynolds number range between 16.4k and 61.7k. When the axial flow is directed from the fixed end to the free end of the rod, while vibrations frequencies were accurately modelled, replicating precise unsteady flow behaviour proved more challenging. The study underscores the importance of properly resolving the flow in areas of flow separation to achieve accurate unsteady flow behaviour.

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Section: Free-fixed Configurationsupporting

confidence: 59%

URANS simulation and experimental validation of axial flow-induced vibrations on a blunt-end cantilever rod for nuclear applications

Pauzi,

Iacovides,

Cioncolini

et al. 2024

Preprint

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show abstract

“…We set Θ = 1, Θ = 0 or Θ = −1 and get the so-called symmetric (SIPG), incomplete (IIPG) or nonsymmetric (NIPG) version, respectively, of the discretization of viscous terms. In (7) and (8), C W denotes a positive sufficiently large constant and K T is the transposed matrix to K.…”

Section: Discrete Flow Problemmentioning

confidence: 99%

“…Namely, the flow in veins or the heart or flow-induced vibration of human vocal folds (VFs) producing voice is intensively studied. The problems of FSI have been studied by a number of different methods in several books (e.g., [1][2][3][4][5][6][7]).…”

Section: Introductionmentioning

confidence: 99%

Vibrations of Nonlinear Elastic Structure Excited by Compressible Flow

et al. 2021

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This study deals with the development of an accurate, efficient and robust method for the numerical solution of the interaction of compressible flow and nonlinear dynamic elasticity. This problem requires the reliable solution of flow in time-dependent domains and the solution of deformations of elastic bodies formed by several materials with complicated geometry depending on time. In this paper, the fluid–structure interaction (FSI) problem is solved numerically by the space-time discontinuous Galerkin method (STDGM). In the case of compressible flow, we use the compressible Navier–Stokes equations formulated by the arbitrary Lagrangian–Eulerian (ALE) method. The elasticity problem uses the non-stationary formulation of the dynamic system using the St. Venant–Kirchhoff and neo-Hookean models. The STDGM for the nonlinear elasticity is tested on the Hron–Turek benchmark. The main novelty of the study is the numerical simulation of the nonlinear vocal fold vibrations excited by the compressible airflow coming from the trachea to the simplified model of the vocal tract. The computations show that the nonlinear elasticity model of the vocal folds is needed in order to obtain substantially higher accuracy of the computed vocal folds deformation than for the linear elasticity model. Moreover, the numerical simulations showed that the differences between the two considered nonlinear material models are very small.

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Cylinders in Axial Flow II

Cited by 2 publications

References 55 publications

URANS simulation and experimental validation of axial flow-induced vibrations on a blunt-end cantilever rod for nuclear applications

URANS simulation and experimental validation of axial flow-induced vibrations on a blunt-end cantilever rod for nuclear applications

Vibrations of Nonlinear Elastic Structure Excited by Compressible Flow

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