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Similarity treatment of moving-equilibrium turbulent boundary layers in adverse pressure gradients

Published online by Cambridge University Press:  19 April 2006

B. A. Kader
Affiliation:
Moscow Institute of Mechanical Engineering for Chemical Industry, K. Marx St. 21/4, Moscow
A. M. Yaglom
Affiliation:
Institute of Atmospheric Physics, Academy of Sciences of USSR, Pyzhevsky 3, Moscow

Abstract

Dimensional analysis is applied to the velocity profile U(y) of turbulent boundary layers subjected to adverse pressure gradients. It is assumed that the boundary layer is in moving or local equilibrium in the sense that the free-stream velocity U∞ and kinematic pressure gradient α = ρ−1dP/dx vary only slowly with the co-ordinate x. This assumption implies a rather complicated general equation for the velocity gradient dU/dy which may be considerably simplified for several specific regions of the flow. A general family of velocity profiles is derived from the simplified equations supplemented by some experimental information. This family agrees well with almost all existing data on velocity profiles in adverse-pressure-gradient turbulent boundary layers. It may be used for the derivation of a skin-friction law which predicts satisfactorily the values of the wall shear stress at any non-negative value of the pressure gradient. The variation of the boundary-layer thickness with x is also predicted by dimensional considerations.

Type
Research Article
Copyright
© 1978 Cambridge University Press

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