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  • Journal of Fluid Mechanics, Volume 327
  • November 1996, pp. 101-115

Reynolds-number-independent instability of the boundary layer over a flat surface

  • Paolo Luchini (a1)
  • DOI: http://dx.doi.org/10.1017/S0022112096008476
  • Published online: 01 April 2006
Abstract

A three-dimensional mode of spatial instability, related to the temporal algebraic growth that determines lift-up in parallel flow, is found to occur in the two-dimensional boundary layer growing over a flat surface. This unstable perturbation can be framed within the limits of Prandtl's standard boundary-layer approximation, and therefore develops at any Reynolds number for which the boundary layer exists, in sharp contrast to all previously known flow instabilities which only occur beyond a sharply defined Reynolds-number threshold. It is thus a good candidate for the initial linear amplification mechanism that leads to bypass transition.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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