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Large-scale structures in a forced turbulent mixing layer

Published online by Cambridge University Press:  20 April 2006

M. Gaster ,
E. Kit  and
I. Wygnanski
M. Gaster
Affiliation:
Faculty of Engineering, Tel-Aviv University Permanent address: National Maritime Institute, Teddington, Middlesex, U.K.
E. Kit
Affiliation:
Faculty of Engineering, Tel-Aviv University
I. Wygnanski
Affiliation:
Faculty of Engineering, Tel-Aviv University
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Abstract

The large-scale structures that occur in a forced turbulent mixing layer at moderately high Reynolds numbers have been modelled by linear inviscid stability theory incorporating first-order corrections for slow spatial variations of the mean flow. The perturbation stream function for a spatially growing time-periodic travelling wave has been numerically evaluated for the measured linearly diverging mean flow. In an accompanying experiment periodic oscillations were imposed on the turbulent mixing layer by the motion of a small flap at the trailing edge of the splitter plate that separated the two uniform streams of different velocity. The results of the numerical computations are compared with experimental measurements.

When the comparison between experimental data and the computational model was made on a purely local basis, agreement in both the amplitude and phase distribution across the mixing layer was excellent. Comparisons on a global scale revealed, not unexpectedly, less good accuracy in predicting the overall amplification.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 150 , January 1985 , pp. 23 - 39
Copyright
© 1985 Cambridge University Press

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References

Bouthier M.1972 J. Méc. 11, 599.
Bouthier M.1973 J. Méc. 12, 75.
Crighton, D. G. & Gaster M.1976 J. Fluid Mech. 77, 397.
Crow, S. C. & Champagne F. H.1971 J. Fluid Mech. 48, 547.
Fiedler H. E., Dziomba B., Mensing, P. & Rosgen T.1981 In The Role of Coherent Structures in Modelling Turbulence and Mixing (ed. J. Jimenez). Lecture Notes in Physics, vol. 136, p. 219. Springer.
Freymuth P.1966 J. Fluid Mech. 25, 683.
Gaster M.1974 J. Fluid Mech. 66, 465.
Gaster M.1981 In Transition and Turbulence (ed. R. E. Meyer). Academic.
Ho C. M.1981 In Numerical and Physical Aspects of Aerodynamic Flows (ed. T. Cebeci), p. 521. Springer.
Hussain A. K. M. F.1983 Phys. Fluids 26, 2816.
Hussain, A. K. M. F. & Reynolds W. C.1970 J. Fluid Mech. 41, 241.
Landahl M. T.1967 J. Fluid Mech. 29, 441.
Liu, J. T. C. & Merkine L.1976 Proc. R. Soc. Lond. A 352, 213.
Malkus W. V. R.1956 J. Fluid Mech. 1, 521.
Michalke A.1964 J. Fluid Mech. 19, 543.
Michalke A.1965 J. Fluid Mech. 23, 521.
Monkewitz, P. A. & Huerre P.1982 Phys. Fluids 25, 1137.
Oster, D. & Wygnanski I.1983 J. Fluid Mech. 123, 91.
Oster D., Wygnanski, I. & Fiedler H.1977 In Turblence in Internal Flows (ed. S. N. B. Murthy), p. 67. Hemisphere.
Schubaer, B. & Skramstad H. K.1949 NACA Rep. 909.