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Eddy Viscosity and Mixing Length from Measured Boundary Layer Developments

Published online by Cambridge University Press:  07 June 2016

R A McD Galbraith  and
M R Head
R A McD Galbraith
Affiliation:
Cambridge UniversityEngineering Department
M R Head
Affiliation:
Cambridge UniversityEngineering Department
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Summary

To obtain profiles of shear stress and eddy viscosity, the boundary-layer equations in finite-difference form have been applied to published turbulent-boundary-layer developments measured in nominally two-dimensional conditions. In applying this procedure, measured velocity profiles have been represented by members of Thompson’s profile family. Except close to separation, these representations are very satisfactory, and derived shear-stress profiles are generally in good agreement with direct measurements. Various eddy-viscosity and mixing-length models are compared with the results of the analysis and are found in general to differ widely among themselves and from the present results. The widely used assumption, l = ky in the wall region, appears to be invalid.

Type
Research Article
Information
Aeronautical Quarterly , Volume 26 , Issue 2 , May 1975 , pp. 133 - 154
Copyright
Copyright © Royal Aeronautical Society. 1975

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