Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-25T16:55:25.223Z Has data issue: false hasContentIssue false
  • English
  • Français

Turbulence structure of a reattaching mixing layer

Published online by Cambridge University Press:  20 April 2006

C. Chandrsuda  and
P. Bradshaw
C. Chandrsuda
Affiliation:
Department of Aeronautics, Imperial College, London
P. Bradshaw
Affiliation:
Department of Aeronautics, Imperial College, London
Get access Rights & Permissions [Opens in a new window]

Abstract

Hot-wire measurements of second- and third-order mean products of velocity fluctuations have been made in the flow behind a backward-facing step with a thin, laminar boundary layer at the top of the step. Measurements extend to a distance of about 12 step heights downstream of the step, and include parts of the recirculating-flow region: approximate limits of validity of hot-wire results are given. The Reynolds number based on step height is about 105, the mixing layer being fully turbulent (fully three-dimensional eddies) well before reattachment, and fairly close to self-preservation in contrast to the results of some previous workers. Rapid changes in turbulence quantities occur in the reattachment region: Reynolds shear stress and triple products decrease spectacularly, mainly because of the confinement of the large eddies by the solid surface. The terms in the turbulent energy and shear stress balances also change rapidly but are still far from the self-preserving boundary-layer state even at the end of the measurement region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 110 , September 1981 , pp. 171 - 194
Copyright
© 1981 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

Antonia, R. A. & Luxton, R. E. 1972 J. Fluid Mech. 53, 737.
Bradbury, L. J. S. 1965 J. Fluid Mech. 23, 31.
Bradshaw, P. 1966 J. Fluid Mech. 26, 225.
Bradshaw, P. 1972 Imperial College Aero. Rep. 72–10.
Bradshaw, P. 1975 Trans. A.S.M.E. I, J. Fluids Engng 97, 146.
Bradshaw, P. 1976 Theoretical and Applied Mechanics (ed. W. T. Koiter), p. 103. North-Holland.
Bradshaw, P. 1978 Imperial College Aero. Tech. Note 78–105.
Bradshaw, P. & Wong, F. Y. F. 1972 J. Fluid Mech. 52, 113.
Brederode, V. A. S. L. 1975 Three-dimensional effects in nominally two-dimensional flow. Ph.D. thesis, Imperial College, London University.
Bryer, D. W. & Pankhurst, R. C. 1971 Pressure Probe Methods for Determining Wind Speed and Flow Direction. London: H.M.S.O.
Castro, I. P. 1973 A highly distorted turbulent free shear layer. Ph.D. thesis, Imperial College, London University.
Castro, I. P. & Bradshaw, P. 1976 J. Fluid Mech. 73, 265.
Chandrsuda, C. 1976 A reattaching turbulent shear layer in incomprehensible flow. Ph.D. thesis, Imperial College, London University. (Available on microfiche from Department of Aeronautics.)
Christiansen, T. & Bradshaw, P. 1981 Submitted to J. Phys. E.
Eaton, J. A. & Johnston, J. P. 1980 A.I.A.A. paper no. 80–1438.
Etheridge, D. W. & Kemp, P. H. 1978 J. Fluid Mech. 86, 545.
Gaviglio, J., Dussauge, J. P., Debieve, J. F. & Favre, A. 1977 Phys. Fluids Suppl. 20, 179.
Di Gesso, J. A. 1975 An experimental investigation of two dimensional. separated, internal flows. Ph.D. thesis, Exeter University.
Hinze, J. O. 1959 Turbulence. McGraw Hill.
Hussain, A. K. M. F. & Zedan, M. F. 1978 Phys. Fluids 21, 1100.
Kim, J., Kline, S. J. & Johnston, J. P. 1978 Thermosci. Div., Stanford Univ. Rep. MD-37.
Klebanoff, P. S. 1955 N.A.C.A. Rep. no. 1247.
Kuehn, D. M. 1980 A.I.A.A. J. 18, 343.
Murlis, J. 1975 Ph.D. thesis, Imperial College, London University.
Murlis, J., Tsai, H. M. & Bradshaw, P. 1980 Submitted to J. Fluid Mech.
Rodi, W. 1971 Imperial College Mech. Engng Dept Rep. ET/TN/B/10; DISA Information no. 17, p. 9 (1975).
Roshko, A. & Lau, J. C. 1965 Proc. 1965 Heat Transfer and Fluid Mechanics Institute (ed. A. F. Charwat). Stanford University Press.
Sivasegaram, S. 1971 J. Roy. Aero. Soc. 75, 793.
Smits, A. J., Eaton, J. A. & Bradshaw, P. 1979 J. Fluid Mech. 94, 209.
Smits, A. J., Young, S. T. B. & Bradshaw, P. 1979 J. Fluid Mech. 94, 243.
Tani, I., Iuchi, M. & Komoda, H. 1961 Aero. Res. Inst., Univ. of Tokyo Rep. no. 364.
Thomas, N. H. & Hancock, P. E. 1977 J. Fluid Mech. 82, 481.
Weir, A. D. & Bradshaw, P. 1974 Imperial College Aero. Rep. no. 74–09.
Wood, D. H. 1980 A reattaching turbulent thin shear layer. Ph.D. thesis, Imperial College, London University.
Wygnanski, I., Oster, D., Fiedler, H. & Dziomba, B. 1979 J. Fluid Mech. 93, 325.