Measurement of the Reynolds stresses and the mean-flow field in a three-dimensional pressure-driven boundary layer

Author:

Müller Udo R.

Abstract

An experimental study of a steady, incompressible, three-dimensional turbulent boundary layer approaching separation is reported. The flow field external to the boundary layer was deflected laterally by turning vanes so that streamwise flow deceleration occurred simultaneous with cross-flow acceleration. At 21 stations profiles of the mean-velocity components and of the six Reynolds stresses were measured with single- and X-hot-wire probes, which were rotatable around their longitudinal axes. The calibration of the hot wires with respect to magnitude and direction of the velocity vector as well as the method of evaluating the Reynolds stresses from the measured data are described in a separate paper (Müller 1982, hereinafter referred to as II). At each measuring station the wall shear stress was inferred from a Preston-tube measurement as well as from a Clauser chart. With the measured profiles of the mean velocities and of the Reynolds stresses several assumptions used for turbulence modelling were checked for their validity in this flow. For example, eddy viscosities for both tangential directions and the corresponding mixing lengths as well as the ratio of resultant turbulent shear stress to turbulent kinetic energy were derived from the data.

Publisher

Cambridge University Press (CUP)

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics

Reference55 articles.

1. Chapman, D. R. 1980 Trends and Pacing Items in Computational Aerodynamics. In Proc. 7th Int. Conf. on Numerical Methods in Fluid Dynamics, Stanford University . Lecture Notes in Physics, vol. 141p.1.Springer.

2. Müller, U. R. & Krause, E. 1979 Measurements of mean velocities and Reynolds stresses in an incompressible three-dimensional turbulent boundary layer. In Proc. 2nd Symp. on Turbulent Shear Flows, Imperial College, London ,p.15.36.

3. Berg, B. V. D. & Elsenaar, A. 1972 Measurements in a three-dimensional incompressible turbulent boundary layer in an adverse pressure gradient underinfinite swept wing conditions.NLR Tech. Rep. no. 72092 U.

4. Bradshaw, P. , Ferriss, D. H. & Atwell, N. P. 1967 Calculation of boundary-layer development using the turbulent energy equation.J. Fluid Mech. 28,593.

5. Rotta, J. C. 1977 A family of turbulence models for three-dimensional thin shear layers. In Proc. 1st Symp. on Turbulent Shear Flows, Pennsylvania State Univ .,p.10.27.

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