Zeitschrift für Physik B Condensed Matter

, Volume 89, Issue 1, pp 11–19

Intermittency in the Navier-Stokes dynamics

  • Siegfried Grossmann
  • Detlef Lohse
Original Contributions

DOI: 10.1007/BF01320823

Cite this article as:
Grossmann, S. & Lohse, D. Z. Physik B - Condensed Matter (1992) 89: 11. doi:10.1007/BF01320823

Abstract

Intermittency effects in high Reynolds number turbulence (Re≈103–106) are calculated from the Navier-Stokes equation in Fourier-Weierstrass approximation. First, the probability density functions (PDF) of scale resolved turbulent signals is found to be Gaussian for large scales, whereas for smaller scales the PDF changes (in agreement with experiment) to a more and more stretched exponential type. This is due to intermittent small scale fluctuations which are caused by the competition between turbulent energy transfer downscale and viscous energy loss. Second, we calculate the moments of ther-averaged energy dissipation rate εr (x) and theirr-scaling exponents μ(m/3). Our results well agree with experiment and numerical simulations of the full Navier-Stokes equations (μ(2)=0.29±0.02). We analytically show that the common identification between the μ(m/3) and the corrections δζ(m) to classical scaling of the velocity structure functions (Kolmogorov's refined similarity hypothesis) is doubtful, because even Gaussian ∂1u1-PDFs (characterizing non intermittent flow) lead to μ(m/3)≠0.

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Siegfried Grossmann
    • 1
  • Detlef Lohse
    • 1
  1. 1.Fachbereich PhysikPhilipps-UniversitätMarburgFederal Republic of Germany

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