Predicting turbulence-induced vibration in axial annular flow by means of large-eddy simulations

Abstract

Turbulence-induced vibration is typically considered as a type of vibration with one-way coupling between the fluid flow and the structural motion: the turbulence creates an incident force field on the structure, but the structural displacement does not influence the turbulence. It is however challenging to measure the turbulence forcing function experimentally. In this article, the forcing function in annular flow is computed by means of Large-Eddy Simulations. The pressure spectrum is applied to the inner cylinder and the resulting vibration is computed. It is shown that the commonly used multiplication hypothesis does not hold for the present results. The computed spectrum showed an upper limit to the coherence length. The results of these computations are compared to experimental results available in literature and to semi-empirical models. The predicted displacements compared well with experimental results.

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

“…A quasi-Newton method, which approximates the inverse of the Jacobian of the residual matrix (IQN-ILS), as developed by Degroote (2013) and detailed in Appendix A, was used. This method has proven to be more efficient and stable compared to the commonly used Gauss-Seidel (GS) algorithm [42] and has also been used for relatively similar simulations involving high-stiffness materials in turbulent flow [12,13,43].…”

Analysis of several subcycling schemes in partitioned simulations of a strongly coupled fluid‐structure interaction

“…FSI simulations are particularly interesting for the study of movement‐induced vibrations, in which the movement of the structures reinforces the present flow instability. Nevertheless, FSI is also used to determine the fluid‐elastic properties of structural vibrations with more limited amplitude, such as to avoid fretting in tube arrays subjected to an axial flow or to quantify flutter dynamics in airplanes or turbomachinery . In classical FSI cases, the flow and structure solvers apply the same time step in transient simulations.…”

“…With the available modern-day computing power, fluid-structure interaction (FSI) simulations are increasingly used in academia to predict and understand the flow-induced vibrations in numerous applications. FSI simulations are particularly interesting for the study of movement-induced vibrations, 1 in which the movement of the structures reinforces the present flow instability. Nevertheless, FSI is also used to determine the fluid-elastic properties of structural vibrations with more limited amplitude, such as to avoid fretting in tube arrays subjected to an axial flow 1 or to quantify flutter dynamics in airplanes 2 or turbomachinery.…”

A multi-stage approach of simulating turbulence-induced vibrations in a wire-wrapped tube bundle for fretting wear prediction

“…The turbulence excitation load obtained via a large-eddy simulation is applied on a structural model augmented with modal properties determined via strongly coupled URANS-FSI simulations. A similar approach has been followed by De Ridder et al for a single bare cylinder in axial flow [31,37] in the frequency domain. In the current work contact detection with neighboring fuel pins is used, to accurately represent the boundary conditions.…”