Abstract
The dominant feature of turbulence close to a wall (y + < 30) is the streaky structure of the streamwise velocity field. Denoting the resulting flow pattern as U(y, z) it is noted that the spanwise profiles U(z) at a fixed distance y from the wall are inflectional, similar to periodic wake flow, while profiles U(y) at fixed z may also have instantaneous inflection points. Instabilities resulting from such inflection points have been invoked by several authors (see the review by Robinson, 1991) as a fundamental part of the mechanism of near-wall turbulence. In particular Hamilton et al.(1995) use such instabilities to close a regeneration cycle for near-wall turbulence.
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References
Hamilton, J.M., Kim, J. and Waleffe, F. (1995) Regeneration mechanisms of near-wall
turbulence structures, J. Fluid Mech287, 317–348 Robinson, S.K. (1991) Coherent motions in the turbulent boundary layer.Ann. Rev
Fluid Mech., bf 23,601–639 Sandham, N.D. and Kleiser, L. (1993) The late stages of transition to turbulence in channel flow, J. Fluid Mech., 245, 319–348
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© 1996 Kluwer Academic Publishers
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Sandham, N.D. (1996). Instability Considerations for Velocity Streaks in Near-Wall Turbulence. In: Gavrilakis, S., Machiels, L., Monkewitz, P.A. (eds) Advances in Turbulence VI. Fluid Mechanics and its Applications, vol 36. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0297-8_12
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DOI: https://doi.org/10.1007/978-94-009-0297-8_12
Publisher Name: Springer, Dordrecht
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