Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-28T07:39:06.832Z Has data issue: false hasContentIssue false
  • English
  • Français

Surface-roughness effects on the mean flow past circular cylinders

Published online by Cambridge University Press:  19 April 2006

O. Güven ,
C. Farell  and
V. C. Patel
O. Güven
Affiliation:
Endem Insaat, Büyükdere Caddesi Yonca B Blok 121/22, Levent, Istanbul, Turkey
C. Farell
Affiliation:
St Anthony Falls Hydraulic Laboratory, University of Minnesota, Minneapolis, Minnesota 55414
V. C. Patel
Affiliation:
Institute of Hydraulic Research, University of Iowa, Iowa City, Iowa 52242
Get access Rights & Permissions [Opens in a new window]

Abstract

Measurements of mean-pressure distributions and boundary-layer development on rough-walled circular cylinders in a uniform stream are described. Five sizes of distributed sandpaper roughness have been tested over the Reynolds-number range 7 × 104 to 5·5 × 105. The results are examined together with those of previous investigators, and the observed roughness effects are discussed in the light of boundary-layer theory. It is found that there is a significant influence of surface roughness on the mean-pressure distribution even at very large Reynolds numbers. This observation is supported by an extension of the Stratford–Townsend theory of turbulent boundary-layer separation to the case of circular cylinders with distributed roughness. The pressure rise to separation is shown to be closely related, as expected, to the characteristics of the boundary layer, smaller pressure rises being associated with thicker boundary layers with greater momentum deficits. Larger roughness gives rise to a thicker and more retarded boundary layer which separates earlier and with a smaller pressure recovery.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 98 , Issue 4 , 26 June 1980 , pp. 673 - 701
Copyright
© 1980 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 and skin friction around a circular cylinder in cross-flow up to Re = 5·106. J. Fluid Mech. 34, 625.Google Scholar
Achenbach, E. 1971 Influence of surface roughness on the crossflow around a circular cylinder. J. Fluid Mech. 46, 321.Google Scholar
Achenbach, E. 1977 The effect of surface roughness on the heat transfer from a circular cylinder to the cross flow of air. Int. J. Heat Mass Transfer. 20, 359.Google Scholar
Armitt, J. 1968 The effect of surface roughness and free stream turbulence on the flow around a model cooling tower at critical Reynolds numbers. Proc. Symp. on Wind effects on Buildings and Structures. Loughborough University of Technology.
Batham, J. P. 1973 Pressure distributions on circular cylinders at critical Reynolds numbers. J. Fluid Mech. 57, 209.Google Scholar
Bearman, P. W. 1969 On vortex shedding from a circular cylinder in the critical Reynolds number regime. J. Fluid Mech. 37, 577.Google Scholar
Dvorak, F. A. 1969 Calculation of turbulent boundary layers on rough surfaces in pressure gradient. A.J.A.A. J. 7, 1752.Google Scholar
Fage, A. 1929 The air flow around a circular cylinder in the region where the boundary layer separates from the surface. Aero. Res. Comm. 1179.Google Scholar
Fage, A. & Warsap, J. H. 1929 The effects of turbulence and surface roughness on the drag of a circular cylinder. Aero. Res. Comm. 1283.Google Scholar
Farell, C. 1971 On the modelling of wind loading on large cooling towers. Proc. 2nd Ann. Thermal Power Conf. 5th Biennial Hydraul. Conf., p. 139. Washington State University, Pullman, Washington.Google Scholar
Farell, C., Carrasquel, S., Güven, O. & Patel, V. C. 1977 Effect of tunnel walls on the flow past circular cylinders and cooling tower models. Trans. A.S.M.E. I, J. Fluids Engng 99, 470.Google Scholar
Farell, C., Güven, O. & Maisch, F. 1976 Mean wind loading on rough-walled cooling towers. A.S.C.E. J. Engng Mech. Div. 102, no. EM6, 1059.Google Scholar
Farell, C., Güven, O. & Patel, V. C. 1976 Laboratory simulation of wind loading of rounded structures. Proc. I.A.S.S. World Cong. on Space Enclosures. Montreal.Google Scholar
Farell, C. & Maisch, E. F. 1974 External roughness effects on the mean wind pressure distribution on hyperbolic cooling towers. Iowa Inst. Hydraul. Res. Rep. no. 164.Google Scholar
Feindt, E. G. 1957 Untersuchungen uber die Abhangigkeit des Umschlages Laminarturbulent von der Oberflachenrauhigkeit und der Druckverteilung. Jb. Schiffbautech. Ges. 50, 180.Google Scholar
Güven, O. 1975 An experimental and analytical study of surface-roughness effects on the mean flow past circular cylinders. Ph.D. thesis, University of Iowa.
Güven, O., Patel, V. C. & Farell, C. 1975a Surface roughness effects on the mean flow past circular cylinders. Iowa Inst. Hydraulic Res. Rep. no. 175.Google Scholar
Güven, O., Patel, V. C. & Farell, C. 1975b Appendix 2 to Iowa Inst. Hydraul. Res. Rep. no. 175.
Güven, O., Patel, V. C. & Farell, C. 1977 A model for high-Reynolds-number flow past rough-walled circular cylinders. Trans. A.S.M.E. I, J. Fluids Engng 99, 486.Google Scholar
Hall, O. J. & Gibbings, J. C. 1972 Influence of stream turbulence and pressure gradient upon boundary-layer transition. J. Mech. Eng. Sci. 14, 134.Google Scholar
Head, M. R. 1958 Entrainment in the turbulent boundary layers. Aero. Res. Counc. R. & M. 3152.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. N.A.S.A. Tech. Rep. R-300.Google Scholar
Niemann, H. J. 1971 On the stationary wind loading of axisymmetric structures in the transcritical Reynolds number region. Inst. Konstruktiven Ingenieurbau, Ruhr-Univ. Bochum, Rep. no. 71–2.Google Scholar
Patel, V. C. 1968 The effects of curvature on the turbulent boundary layer. Aero. Res. Counc. R. & M. 3599.Google Scholar
Patel, V. C., Nakayama, A. & Damian, R. 1974 Measurements in the thick turbulent boundary layer near the tail of a body of revolution. J. Fluid Mech. 63, 345.Google Scholar
Richter, A. & Naudascher, E. 1976 Fluctuating forces on a rigid circular cylinder in confined flow. J. Fluid Mech. 78, 561.Google Scholar
Rosenhead, L. 1963 Laminar Boundary Layers. Oxford University Press.
Roshko, A. 1961 Experiments on the flow past a circular cylinder at very high Reynolds number. J. Fluid Mech. 10, 345.Google Scholar
Roshko, A. 1970 On the aerodynamic drag of cylinders at high Reynolds number. U.S.-Japan Res. Seminar on Wind Loads on Structures. Honolulu.Google Scholar
Stratford, B. 1959 The prediction of separation of the turbulent boundary layer. J. Fluid Mech. 5, 1.Google Scholar
Szechenyi, E. 1974 Simulation de nombres de Reynolds élevés sur un cylindre en soufflerie. La Recherche Aérospatiale 1974–3, 155.
Szechenyi, E. 1975 Supercritical Reynolds number simulation for two-dimensional flow over circular cylinders. J. Fluid Mech. 70, 529.Google Scholar
Townsend, A. A. 1962 The behaviour of a turbulent boundary layer near separation. J. Fluid Mech. 12, 536.Google Scholar
Van Nunen, J. W. G., Persoon, A. J. & Tijdeman, H. 1974 Pressures and forces on a circular cylinder in a cross flow at high Reynolds numbers. IUTAM/AHR Symp. on Flow-Induced Structural Vibrations, p. 748. Springer. (Also Nat. Aero. Lab. Rep. NLR TR 69102 U, Nederland, prepared for the European Space Vehicle Launcher Development Organization ELDO.)Google Scholar