An improved mathematical model for the aerodynamic forces on tandem cylinders in motion with aeroelastic applications

Simpson, A.; Flower, J. W.

doi:10.1016/s0022-460x(77)80032-1

Cited by 34 publications

(9 citation statements)

References 6 publications

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“…where P U is the fluid velocity, D the tube diameter, and μ the time delay coefficient which is taken to be of order 1 as suggested by Simpson and Flower (1977). As the time delay coefficient is always taken as a constant, the quasi-steady model is also called the constant time delay model.…”

Section: Quasi-steady Modelmentioning

confidence: 99%

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: Quasi-steady Modelmentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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“…Different forms of fluid forces acting on cylinders have been proposed (Hardy and Cloutier 1973;Rawlins 1976;Simpson and Flower 1977;Tsui and Tsui 1979). A summary of these models is given in Table 9.3.…”

Section: Wake-induced Fluttermentioning

confidence: 99%

“…These phenomena have been studied experimentally and analytically by Wilson and Caldwell (1971), Tanida et al (1973), King and Johns (1976), Simpson and Flower (1977), Tsui (1977) and Zdravkovich (1974) and others.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Vibration of Circular Cylindrical Structures

Chen

1985

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203

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A major purpose of the Technical Information Center is to provide the broadest dissemination possible of information contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments.Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the research discussed herein. ANL-85-51 ------------------------------ 11-6References--Sec. Current DOE funding for this work is from the Office of Reactor Systems, Development and Technology within the Office of Nuclear Energy.A significant amount of material presented in this report is taken from the results of various program activities sponsored by AEC, ERDA, and DOE at ANL.The author is indebted to those who supported the program at ANL throughout the years, in particular, Messrs. Nicholas Grossman and Chet Bigelow for their interest and recognition of this important and challenging subject.The author is grateful for the support received from his colleagues of the Vibration Analysis Section of the Components Technology Division of ANL, which provides the resources necessary to perform this work.The Section Manager, Dr. M. W. Wambsganss, with his unfaltering faith in me, gave me encouragement and confidence to complete this report.Grateful appreciation is expressed to Miss Joyce Stephens for her superb typing and word-processing and to Mrs. S. K. Zussman for her expert editing of the manuscript. 28 CREDITSThe author and Argonne National Laboratory gratefully acknowledge the courtesy of the organizations aLid individuals who granted permission to use illustrations and. other information in this report.The sources of this information are listed below. Figs. 6.3, 6.4 This report summarizes the flow-induced vibration of circular cylinders in quiescent fluid, axial flow, and crossf low, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders.

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“…Research activities included aerodynamic force measurements [17] and mathematical analyses (for example [18]). It has been found that the presence of wind velocity gradient across the wake of the windward object would induce position-dependent lift and drag forces on the downstream cable.…”

Section: Vibrations Caused By Wake Interferencementioning

confidence: 99%