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Eddy Viscosity and Mixing Length from Measured Boundary Layer Developments

  • R A McD Galbraith (a1) and M R Head (a1)
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.

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The Aeronautical Journal
  • ISSN: 0001-9259
  • EISSN: 2398-2179
  • URL: /core/journals/aeronautical-journal
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