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The Turbulent Flow in the Close-Up Region of Fractal Grids

  • Stefan WeitemeyerEmail author
  • Robert Stresing
  • Michael Hölling
  • Joachim Peinke
Part of the Springer Proceedings in Physics book series (SPPHY, volume 141)

Abstract

Turbulence generated by fractal square grids differs substantially from all other documented turbulent flows. Previous experiments indicated that the turbulence intensity reaches its maximum at a position proportional to the length and thickness of the largest bar in the grid [2]. The goal of this work was to investigate the evolution of the flow behind grids with different smallest scales. Hot wire measurements were conducted close to the grid in two different wind tunnels using three different fractal grids. It was found that the positions of the flatness peak and turbulence intensity peak change by altering the numbers of iterations and the blockage ratio respectively. Furthermore, it was shown that this result is invariant to the investigated different boundary conditions.

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References

  1. 1.
    Hurst, D., Vassilicos, J.C.: Scalings and decay of fractal-generated turbulence. Phys. Fluids 19, 035103 (2007)CrossRefGoogle Scholar
  2. 2.
    Mazellier, N., Vassilicos, J.C.: Turbulence without Richardson-Kolmogorov cascade (2010), http://arxiv.org/abs/0911.0841
  3. 3.
    Seoud, R.E., Vassilicos, J.C.: Dissipation and decay of fractal-generated turbulence. Phys. Fluids 19, 105–108 (2007)CrossRefGoogle Scholar
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    Stresing, R., Peinke, J., Seoud, R.E., Vassilicos, J.C.: Defining a new class of turbulent flows. Phys. Rev. Lett. 104, 194501 (2010)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Stefan Weitemeyer
    • 1
    Email author
  • Robert Stresing
    • 1
  • Michael Hölling
    • 1
  • Joachim Peinke
    • 1
  1. 1.ForWind - Institute of PhysicsUniversity of OldenburgOldenburgGermany

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