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A turbulent mixing layer constrained by a solid surface. Part 2. Measurements in the wall-bounded flow

Published online by Cambridge University Press:  20 April 2006

D. H. Wood  and
P. Bradshaw
D. H. Wood
Affiliation:
Department of Aeronautics, Imperial College, London Present address: Department of Mechanical Engineering, University of Newcastle, N.S.W. 2308, Australia.
P. Bradshaw
Affiliation:
Department of Aeronautics, Imperial College, London
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Abstract

The single- and two-point measurements made in a high-Reynolds-number single-stream mixing layer growing to encounter a wind-tunnel floor on its high-velocity side that were described by Wood & Bradshaw (1982) have been extended to the wall-bounded flow. It is shown that the expected large amplification of the normal-stress components in the plane of the wall does not occur until after the mixing layer reaches the surface. There is some evidence that the double-roller component of the large-eddy structure of the original free shear layer is being re-established in the wall-bounded flow after having been stretched and weakened by the initial effect of the wall. The triple-product terms appearing in the turbulent-energy and shear-stress equations are altered in a way that cannot be reproduced by models used in current calculation methods. It appears that all the pressure-fluctuation terms in the individual normal-stress and shear-stress transport equations respond in a non-monotonic manner to the imposition of the wall. The implications for calculation methods suitable for predicting the change from an initially unaffected free shear layer to a wall-bounded flow are discussed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 139 , February 1984 , pp. 347 - 361
Copyright
© 1984 Cambridge University Press

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References

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