Hostname: page-component-5d59c44645-jb2ch Total loading time: 0 Render date: 2024-02-29T07:41:52.931Z Has data issue: false hasContentIssue false

On critical flow around smooth circular cylinders

Published online by Cambridge University Press:  20 April 2006

C. Farell
Affiliation:
St Anthony Falls Hydraulic Laboratory, Department of Civil and Mineral Engineering, University of Minnesota, Minneapolis, Minnesota 55414
J. Blessmann
Affiliation:
Laboratório de Aerodinâmica das Construcões, Pós-Graduação em Engenharia Civil, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil

Abstract

The characteristics of the flow around a smooth circular cylinder in the critical Reynolds-number range have been investigated experimentally on the basis of instantaneous mean-pressure-distribution measurements on the cylinder and of hot-wire velocity-fluctuation measurements in the cylinder wake. Two subregions have been identified in the critical or lower transition; the first characterized by symmetric pressure distributions, intense vortex shedding, and gradual and significant variations in characteristic parameters as the Reynolds number increases, and the second by intense flow oscillations associated with formation and bursting of laminar-separation bubbles on one or both sides of the cylinder, without preference for side. The spectra of the velocity fluctuations in the second, unsteady subrange appear in general with broad band peaks. The spectral peak in the twin-bubble regime which follows this second subrange is sharp but has little energy compared to subcritical peaks.

Type
Research Article
Copyright
© 1983 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Achenbach, E. 1968 Distribution of local pressure skin friction around a circular cylinder in cross flow up to Re = 5 x 106. J. Fluid Mech. 34, 625810.Google Scholar
Achenbach, E. & Heinecke, E. 1981 On vortex shedding from smooth and rough cylinders in the range of Reynolds numbers from 6 x 103 to 5 x 106. J. Fluid Mech. 109, 239810.Google Scholar
Batham, J. P. 1973 Pressure distributions on circular cylinders at critical Reynolds numbers J. Fluid Mech. 57, 209228.Google Scholar
Blessmann, J. 1982 The boundary-layer TV-2 wind tunnel of the UFRGS J. Wind Engng and Indust. Aerodyn. 10, 231248.Google Scholar
Bearman, P. W. 1969 On vortex shedding from a circular cylinder in the critical Reynolds number regime J. Fluid Mech. 37, 577585.Google Scholar
Delany, N. K. & Sorensen, N. E. 1953 Low-speed drag of cylinders of various shapes. NACA Tech. Note 3038.Google Scholar
Farell, C. 1981 Flow around fixed circular cylinders: fluctuating loads. J. Engng Mech. Div. ASCE 107 (EM3).Google Scholar
Farell, C., Carrasquel, S., GÜVEN, O. & Patel, V. C. 1977 Effects of wind tunnel walls on the flow past circular cylinders and cooling tower models. Trans. ASME I: J. Fluids Engng 99, 470810.Google Scholar
Güven, O., Farell, C. & Patel, V. C. 1980 Surface roughness effects on the mean flow past circular cylinders J. Fluid Mech. 98, 673701.Google Scholar
Jones, G. W., Cincotta, J. J. & Walker, R. W. 1969 Aerodynamic forces on a stationary and oscillating circular cylinder at high Reynolds numbers. NASA TR R-300.
Morkovin, M. V. 1964 Flow around a circular cylinder – a kaleidoscope of challenging fluid phenomena. In Proc. ASME Symp. on Fully Separated Flows, pp. 102118.
Richter, A. & Naudascher, E. 1976 Fluctuating forces on a rigid circular cylinder in confined flow J. Fluid Mech. 78, 561576.Google Scholar
Roshko, A. 1961 Experiments on the flow past a circular cylinder at very high Reynolds number J. Fluid Mech. 78, 561576.Google Scholar