Finite-Amplitude Disturbances and Near-Threshold Instability of Hydrodynamic Flows

  • S. S. Moiseev
  • V. G. Pungin
  • N. V. Suyazov
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


We consider theoretical models of possible initial stages of development, due to finite-amplitude wave instability,of turbulent spots in stratified shear flows when wave and flow parameters are near the stability threshold. It is shown that, in contrast to analogous processes in plasma, nonlinear frequency shift does not provide saturation of explosive resonant interaction of the marginal waves. A condition of instability due to redistribution of energy, by wave-induced turbulence, from the flow to wave is found and estimates of the growth rate are obtained analytically.


Internal Wave Turbulent Spot Vertical Density Profile Free Surface Displacement Stratify Shear Flow 
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Copyright information

© Springer-Verlag, Berlin, Heidelberg 1985

Authors and Affiliations

  • S. S. Moiseev
    • 1
  • V. G. Pungin
    • 1
  • N. V. Suyazov
    • 1
  1. 1.Space Research InstituteMoscowRussia

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