An Unsteady Theory For Fluidelastic Instability in an Array of Flexible Tubes in Cross-Flow. Part I: Theory

Yetisir, M.; Weaver, David

doi:10.1006/jfls.1993.1044

Cited by 51 publications

(17 citation statements)

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“…This periodic excitation is known as: flow periodicity, Strouhal periodicity, or periodic vortex shedding. A narrow band of peak appears in the turbulence and pressure spectra as shown in Figure , rotated square D. Weaver et al, 1993), normal triangular (Polak & Weaver, 1995;S Ziada, 1998) and rotated triangular tube arrays S Ziada & Oengören, 2000).…”

Section: Flow Periodicity In Tube Arraysmentioning

confidence: 94%

“…However, static instability was found to exist in both transverse and streamwise directions. Yetisir and Weaver (1993) refined the theoretical model by introducing some assumptions, such as the disturbance decay function which accounts for flow perturbation due to the tube motion, phase function as well as flow attachment and separation points. The authors also extended the model to multiple flexible tubes in the array.…”

Section: Semi-analytical Modelmentioning

confidence: 99%

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Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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Tube arrays in industrial components such as heat exchangers and steam generators are susceptible to damage due to fluidelastic instability (FEI). This study focuses on the modelling of fluidelastic instability in tube arrays subjected to cross-flow. There is agreement on the idea of introducing a time delay in FEI models. Although it is one of the key parameters for FEI models, the phenomenon behind this time delay is still subject to many possible explanations, and the underlying physics is still not well understood.In the present work a new time delay formulation for the class of the quasi-steady FEI models is derived in the frequency domain in the form of an Equivalent Theodorsen Function.Unsteady and quasi-static fluid forces were measured to develop the time delay formulation.The effect of Reynolds number on the static force coefficients was also investigated. The time delay function was found to be also dependent on the Reynolds number which implies that the fluidelastic instability is also Reynolds number dependent. Comparison to other time delay functions proposed in the quasi-steady and quasi-unsteady models is made. An initial overshoot in the lift force was observed for the present model.

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Section: Flow Periodicity In Tube Arraysmentioning

confidence: 94%

Section: Semi-analytical Modelmentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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“…where f(s) is the area perturbation decay function along the channel, for which several forms have been postulated, including Lever and Weaver (1982), Lever and Weaver (1986), and Yetisir and Weaver (1993). Later, it was formally investigated by El Bouzidi et al (2014) for a normal triangular configuration using CFD.…”

Section: Fluidelastic Force Modelmentioning

confidence: 97%

A comprehensive flow-induced vibration model to predict crack growth and leakage potential in steam generator tubes

Bouzidi

Hassan

Riznic

2015

Nuclear Engineering and Design

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“…This is with agreement with the Lever and Weaver Postulations of the area perturbation decay. While Lever and Weaver (1986a) assumed a linear decay for the area perturbation amplitude, Yetisir and Weaver (1993b) provided an area decay function in the form of…”

Section: Area Perturbationmentioning

confidence: 99%