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On the role of the outer region in the turbulent-boundary-layer bursting process

Published online by Cambridge University Press:  26 April 2006

ROY Y. Myose  and
Ron F. Blackwelder
ROY Y. Myose
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA Present address: Department of Aerospace Engineering, Wichita State University, Wichita, KS 67260-0044, USA.
Ron F. Blackwelder
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA
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Abstract

The dynamics and interaction of turbulent-boundary-layer eddy structures was experimentally emulated. Counter-rotating streamwise vortices and low-speed streaks emulating turbulent-boundary-layer wall eddies were generated by a Görtler instability mechanism. Large-scale motions associated with the outer region of turbulent boundary layer were emulated with — ωz spanwise vortical eddies shed by a periodic non-sinusoidal oscillation of an airfoil. The scales of the resulting eddy structures were comparable to a moderate-Reynolds-number turbulent boundary layer. Results show that the emulated wall-eddy breakdown was triggered by streamwise acceleration associated with the outer region of turbulent boundary layer. This breakdown involved violent mixing between low-speed fluid from the wall eddy and accelerated fluid associated with the outer structure. Although wall eddies can break down autonomously, the presence of and interaction with outer-region — ωz eddies hastened their breakdown. Increasing the — ωz eddy strength resulted in further hastening of the breakdown. Conversely, + ωz eddies were found to delay wall-eddy breakdown locally, with further delays resulting from stronger + ωz eddies. This suggests that the outer region of turbulent boundary layers plays a role in the bursting process.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 259 , 25 January 1994 , pp. 345 - 373
Copyright
© 1994 Cambridge University Press

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References

Acarlar, M. S. & Smith, C. R. 1987 J. Fluid Mech. 175, 1.
Aihara, Y. & Koyama, H. 1981 Trans. Japan Soc. Aero. Space Sci. 24, 78
Aubry, N., Holmes, P., Lumley, J. L. & Stone, E. 1988 J. Fluid Mech. 192, 115.
Bippes, H. 1978 NASA TM 75243.
Blackwelder, R. F. 1983 Phys. Fluids 26, 2807.
Blackwelder, R. F. & Kaplan, R. E. 1976 J. Fluid Mech. 76, 89.
Blackwelder, R. F. & Kovasznay, L. S. 1972 Phys. Fluids 15, 1545.
Blackwelder, R. F. & Swearingen, J. D. 1989 Near wall turbulence, Proc. Zaric Mem. Conf., 1988, p. 268. Hemisphere.
Brown, G. L. & Thomas, A. S. W. 1977 Phys. Fluids 20, S243.
Cantwell, B. J. 1981 Ann. Rev. Fluid Mech. 13, 457.
Chang, S.-I. & Blackwelder, R. F. 1990 J. Fluid Mech. 213, 419.
Chen, C. & Blackwelder, R. F. 1978 J. Fluid Mech. 89, 1.
Corino, E. R. & Brodkey, R. S. 1969 J. Fluid Mech. 39, 1.
Dowling, A. P. 1985 J. Fluid Mech. 160, 447.
Falco, R. E. 1980 AIAA 80–1356.
Falco, R. E. 1990 Phil. Trans. R. Soc. Lond A 336, 103.
Floryan, J. M. & Saric, W. S. 1984 AIAA J. 22, 1529.
Görtler, H. 1940 Math. Phys. Klasse 2, 1 (also NACA TM 1375).
Guezennec, Y., Piomelli, U. & Kim, J. 1989 Phys. Fluids A 1, 764.
Ito, A. 1985 Trans. Japan Soc. Aero. Space Sci. 33, 166.
Jayaraman, R., Parikh, P. & Reynolds, W. C. 1982 Rep. TF-18, Stanford University.
Kim, H. T., Kline, S. J. & Reynolds, W. 1971 J. Fluid Mech. 50, 133.
Klebanoff, P. S. 1954 NACA TN 3178.
Kline, S. J., Reynolds, W. C., Schraub, F. A. & Runstadler, P. W. 1967 J. Fluid Mech. 30, 741.
Kline, S. J. & Robinson, S. K. 1989 Near wall turbulence, Proc. Zaric Mem. Conf., 1988, p. 200. Hemisphere.
Koochesfahani, M. M. 1989 AIAA J. 27, 1200.
Liepmann, H. 1945 NACA WR 4J28.
McLean, I. R. 1990 The near wall eddy structure in an equilibrium turbulent boundary layer. PhD dissertation, University of Southern California.
Myose, R. Y. 1991 An experimental emulation of the interaction of turbulent boundary layer eddy structures. PhD dissertation, University of Southern California.
Myose, R. Y. & Blackwelder, R. F. 1991 AIAA J. 29, 1901.
Naguib, A. M. & Wark, C. E. 1992 J. Fluid Mech. 243, 541.
Robinson, S. K. 1991 Ann. Rev. Fluid Mech. 23, 601.
Smith, C. R. 1978 In Coherent Structures of Turbulent Boundary Layers (ed. C. R. Smith & D. E. Abbott), p. 48. Lehigh University.
Swearingen, J. D. 1985 The growth and breakdown of streamwise vortices in the presence of a wall. PhD dissertation, University of Southern California.
Swearingen, J. D. & Blackwelder, R. F. 1987 J. Fluid Mech. 182, 225.
Talmon, A. M., Kunen, J. M. G. & Ooms, G. 1986 J. Fluid Mech. 163, 459.