Author
Burns Anderson
Bio: Burns Anderson is an academic researcher from University of Guelph. The author has contributed to research in topics: Boundary layer & Strouhal number. The author has an hindex of 1, co-authored 1 publications receiving 22 citations.
Topics: Boundary layer, Strouhal number, Instability, Flow separation
Papers
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TL;DR: In this paper, a time domain model is proposed to predict the fluidelastic instability forces in a tube array, which accounts for temporal variations in the flow separation and a non-linear limit cycle is predicted.
24 citations
Cited by
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TL;DR: In this article, a CFD methodology involving structure motion and dynamic re-meshing has been optimized and applied to simulate the unsteady flow through normal triangular cylinder arrays with one single tube undergoing either forced oscillations or self-excited oscillations due to damping-controlled fluidelastic instability.
38 citations
TL;DR: In this paper, the authors presented a numerical model to predict the unsteady fluid forces in a parallel triangular array subjected to two-phase flow, which was used to simulate an air-water flow in tube array with various air void fractions.
29 citations
TL;DR: In this paper, the authors presented an in-depth study of the time lag in a normal triangular tube array subjected to cross-flow and developed a Computational Fluid Dynamics (CFD) model to simulate the flow inside the tube bundle.
23 citations
TL;DR: In this article, a simulation of a loosely supported multi-span U-bend tube subjected to turbulence and fluidelastic instability forces is presented, where the effect of the support clearance as well as the support offset are investigated.
Abstract: The structural integrity of tube bundles represents a major concern when dealing with high risk industries, such as nuclear steam generators, where the rupture of a tube or tubes will lead to the undesired mixing of the primary and secondary fluids. Flow-induced vibration is one of the major concerns that could compromise the structural integrity. The vibration is caused by fluid flow excitation. While there are several excitation mechanisms that could contribute to these vibrations, fluidelastic instability is generally regarded as the most severe. When this mechanism prevails, it could cause serious damage to tube arrays in a very short period of time. The tubes are therefore stiffened by means of supports to avoid these vibrations. To accommodate the thermal expansion of the tube, as well as to facilitate the installation of these tube bundles, clearances are allowed between the tubes and their supports. Progressive tube wear and chemical cleaning gradually increases the clearances between the tubes and their supports, which can lead to more frequent and severe tube/support impact and rubbing. These increased impacts can lead to tube damage due to fatigue and/or wear at the support locations. This paper presents simulations of a loosely supported multi-span U- bend tube subjected to turbulence and fluidelastic instability forces. The mathematical model for the loosely-supported tubes and the fluidelastic instability model is presented. The model is then utilized to simulate the nonlinear response of a U-bend tube with flat bar supports subjected to cross-flow. The effect of the support clearance as well as the support offset are investigated. Special attention is given to the tube/support interaction parameters that affect wear, such as impact and normal work rate.
21 citations
TL;DR: In this paper, a quasi-unsteady model with a theoretical model of the memory function was used to predict the critical velocity with the static fluid force coefficients obtained from steady RANS simulations.
14 citations