Turbulence without Richardson-Kolmogorov Cascade

Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 141)

Abstract

We study turbulence generated by low-blockage space-filling fractal square grids [5]. This device creates a multiscale excitation of the fluid flow. Such devices have been proposed as alternative and complementary tools for the investigation of turbulence fundamentals, modelling and applications [3, 5, 6]. New insights on the fundamentals of homogeneous turbulence have been found, showing in particular that the small scales are not universal beyond small corrections caused by intermittency, finite Reynolds number and anisotropy. The unprecedented possibilities offered by these devices also open new attractive perspectives in applications involving mixing, combustion and flow management and control.

Keywords

Reynolds Number Turbulence Intensity Homogeneous Turbulence Decay Region Dissipation Constant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Comte-Bellot, G., Corrsin, S.: The use of a contraction to improve the isotropy of grid-generated turbulence. J. Fluid Mech. 25, pt. 4, 657 (1966)CrossRefGoogle Scholar
  2. 2.
    Hurst, D., Vassilicos, J.C.: Scalings and decay of fractal-generated turbulence. Phys. Fluids 19, 035013 (2007)CrossRefGoogle Scholar
  3. 3.
    Seoud, R.E., Vassilicos, J.C.: Dissipation and decay of fractal-generated turbulence. Phys. Fluids 19, 105–108 (2007)CrossRefGoogle Scholar
  4. 4.
    Mazellier, N., Vassilicos, J.C.: Turbulence without Richarson-Kolmogorov cascade. Phys. Fluids 22, 075101 (2010)CrossRefGoogle Scholar
  5. 5.
    Mazellier, N., Vassilicos, J.C.: The turbulence dissipation constant is not universal because of its universal dependence on large-scale flow topology. Phys. Fluids 20, 015101 (2008)CrossRefGoogle Scholar
  6. 6.
    Mydlarski, L., Warhaft, Z.: On the onset of high-Reynolds-number grid-generated wind tunnel turbulence. J. Fluid Mech. 320, 331 (1996)CrossRefGoogle Scholar
  7. 7.
    George, W.K., Wang, H.: The exponential decay of homogeneous turbulence. Phys. Fluids 21, 025108 (2009)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Turbulence, Mixing and Flow Control Group, Department of Aeronautics Institute for Mathematical SciencesImperial College LondonLondonUK
  2. 2.Institut PRISMEUniversité d’OrléansOrléansFrance

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