Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-19T12:32:43.410Z Has data issue: false hasContentIssue false
  • English
  • Français

Pattern-recognition analysis of the velocity field in plane turbulent wakes

Published online by Cambridge University Press:  21 April 2006

J. A. Ferré  and
Francesc Giralt
J. A. Ferré
Affiliation:
Departament d'Enginyeria Quimica i Bioquímica, Divisió VII, Universitat de Barcelona, 43005, Tarragona, Catalunya, Spain
Francesc Giralt
Affiliation:
Departament d'Enginyeria Quimica i Bioquímica, Divisió VII, Universitat de Barcelona, 43005, Tarragona, Catalunya, Spain
Get access Rights & Permissions [Opens in a new window]

Abstract

A pattern-recognition procedure designed to extract footprints of organized structures from turbulent signals is developed and used to analyse the large-eddy organization of several turbulent wake flows. The pattern-recognition technique is intended to be a general-purpose analytical tool that makes no use of specific flow characteristics, and that can be implemented as a computer code independent of the types of signals to be processed. The technique is applied to analyse the wake generated by a single cylinder at downstream positions ranging from x/D = 10 to x/D = 220. Also the structural features of the wakes behind a rotating cylinder, two cylinders of unequal diameters and two cylinders of equal diameter, one rotating, are examined at x/D = 140. In the near wake the large-scale motions detected are Kármán vortices, whose periodic activity persists up to 60 diameters. Further downstream the most significant coherent structures detected are single and double rollers with shear-aligned vorticity, whose dimensions and velocity intensities are properly scaled by the half-width of the wake and the local r.m.s. values, respectively. The similarities observed in the organized motions identified in the different wakes at x/D = 140, suggest that the roller organization may be an intrinsic characteristic of fully developed turbulent plane wake flows, irrespective of initial conditions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 198 , January 1989 , pp. 27 - 64
Copyright
1989 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

Altmann, J. & Reitbrok, H. J. P.1984 IEEE Trans. Pattern Analysis Machine Intelligence 6, 46–57.
Andreopoulos, J.: 1985 J. Fluid Mech. 157, 163–197.
Antonia, R. A.: 1981 Ann. Rev. Fluid Mech. 13, 131–156.
Apelt, C. J. & West, G. S., 1975 J. Fluid Mech. 71, 145–160.
Barsoum, M. L., Kawall, J. G. & Keffer, J. F., 1978 Phys. Fluids 21, 157–161.
Blackwelder, R. F.: 1977 Phys. Fluids 20, S232–S242.
Blackwelder, R. F. & Kaplan, R. E., 1976 J. Fluid Mech. 76, 89–112.
Bow, S.-T.: 1984 Pattern Recognition. Marcel Dekker.
Brown, G. L. & Roshko, A., 1974 J. Fluid Mech. 64, 775–816.
Budny, R. S., Kawall, J. G. & Keffer, J. F., 1979 Proc. Second Intl Symp. on Turb. Shear Flows, London.
Cantwell, B.: 1981 Ann. Rev. Fluid Mech. 13, 457–515.
Cantwell, B. & Coles, D., 1983 J. Fluid Mech. 136, 321–374.
Chen, C-H. P. & Blackwelder, R. F.1978 J. Fluid Mech. 89, 1–31.
Cimbala, J. M.: 1985 Proc. Fifth Intl Symp. on Turb. Shear Flows, Cornell University.
Corino, E. R. & Brodkey, R. S., 1969 J. Fluid Mech. 37, 1–30.
Davies, M. E.: 1976 J. Fluid Mech. 75, 209–231.
Fabris, G.: 1979 J. Fluid Mech. 94, 673–709.
Ferré, J. A.: 1986 Application of an artificial intelligence algorithm to the recognition of coherent structures in turbulent flows (in Catalan). Doctoral thesis, Universitat de Barcelona.
Ferré, J. A. & Giralt, F.1989 J. Fluid Mech. 198, 65–78.
Gavaldà, J.: 1982 The wake generated by static and rotating cylinders of equal diameters (in Catalan). Doctoral Thesis, Universitat de Barcelona.
Grant, H. L.: 1958 J. Fluid Mech. 4, 149–190.
Hayakawa, M. & Hussain, A. K. M. F.1985 Proc. Fifth Intl Symp. on Turb. Shear Flows, Cornell University.
Hussain, A. K. M. F.: 1983 Phys. Fluids 26, 2816–2850.
Hussain, A. K. M. F.: 1986 J. Fluid Mech. 173, 303–356.
Keffer, J. F.: 1965 J. Fluid Mech. 22, 135–159.
Keffer, J. F.: 1967 J. Fluid Mech. 28, 183–193.
Keffer, J. F., Kawall, J. G., Giralt, F. & Beguier, C., 1982 In Turbulence in Heat and Mass Transfer. Hemisphere.
Keffer, J. F. & Kawall, J. G., 1980 AIAA Fluid and Plasma Dyn. Conference, Snowmass, Colorado.
Kim, H. T., Kline, S. J. & Reynolds, W. C., 1971 J. Fluid Mech. 50, 133–160.
Kiya, M. & Matsumura, M., 1985 Bull. JSME, 28, 2617–2624.
Line, S. J., Reynolds, W. C., Schraub, F. A. & Runstadler, P. W., 1967 J. Fluid Mech. 30, 741–773.
Kurosaka, M. & Sundaram, P., 1986 Phys. Fluids 29, 3474–3477.
Lahart, M. J.: 1984 Opt. Engng 23, 710–715.
Laufer, J.: 1975 Ann. Rev. Fluid Mech. 7, 307–326.
Lu, S. S. & Willmarth, W. W., 1973 J. Fluid Mech. 60, 481–511.
Lumley, J. L.: 1965 Proc. Intl Colloq. on Atmospheric Turb. and Radio Wave Propagation, Moscow.
Mumford, J. C.: 1982 J. Fluid Mech. 118, 241–268.
Mumford, J. C.: 1983 J. Fluid Mech. 137, 447–456.
Papailiou, D. D. & Lykoudis, P. S., 1974 J. Fluid Mech. 62, 11–31.
Payne, F. R. & Lumley, J. L., 1967 Phys. Fluids 10, S194–S196.
Perry, A. E. & Watmuff, J. H., 1981 J. Fluid Mech. 103, 33–51.
Prandtl, L. & Tietjens, O. G., 1934 Applied Hydro- and Aeromechanics. Dover.
Reynolds, W. C. & Hussain, A. K. M. F.1972 J. Fluid Mech. 54, 263–288.
Roshko, A.: 1976 AIAAJ. 14, 1349–1357.
Saffmann, P. G.: 1981 In The Role of Coherent Structures in Turbulence Modelling and Mixing (ed. J. Jimenez). Lecture Notes in Physics, vol. 136. Springer.
Savill, A. M.: 1979 Effects on turbulence of curved or distorting mean flow. PhD dissertation, University of Cambridge.
Subramanian, C. S., Rajagopalan, S., Antonia, R. A. & Chambers, A. J., 1982 J. Fluid Mech. 123, 335–362.
Taneda, S.: 1959 J. Phys. Soc. Japan 14, 843–848.
Tennekes, H. & Lumley, J. L., 1972 A First Course in Turbulence. MIT Press.
Townsend, A. A.: 1956 The Structure of Turbulent Shear Flow, 1st edn. Cambridge University Press.
Townsend, A. A.: 1976 The Structure of Turbulent Shear Flow, 2nd edn. Cambridge University Press.
Townsend, A. A.: 1979 J. Fluid Mech. 95, 515–537.
Van Atta, C. W.1974 Ann. Rev. Fluid Mech. 6, 75–91.
Wallace, J. M., Brodkey, R. S. & Eckelmann, H., 1977 J. Fluid Mech. 83, 673–693.
Wallace, J. M., Eckelmann, H. & Brodkey, R. S., 1972 J. Fluid Mech. 54, 39–48.
Whalen, A. D.: 1971 Detection of Signals in Noise. Academic Press.
Wlezien, R. W. & Way, J. L., 1979 AIAA J. 17, 563–570.
Yule, A. J.: 1980 In Turbulent Shear Flows 2 (ed. L. J. S. Bradbury, F. Durst, B. E. Launder, F. W. Schmidt & J. H. Whitelaw). Springer.
Zilbermann, M., Wygnansky, I. & Kaplan, R. E., 1977 Phys. Fluids 20, S258–S271.