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Scale-Energy Fluxes in Wall-Turbulent Flows

  • A. Cimarelli
  • E. De Angelis
  • C. M. Casciola
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 141)

Abstract

According to the Kolmogorov theory, the most important feature of high Reynolds number turbulent flows is the energy transfer from large to small scales. This energy cascade is believed to universally occur in a certain interval of scales, known as inertial range. This phenomenology has been shown to occur in a wide range of flows but not in wall-turbulence where a reverse cascade in the near-wall region is observed [1]. In order to analyse this new scenario, in the present work a study of a generalized Komogorov equation is performed. The results reveal an energy fluxes loop in the space of scales where the reverse cascade plays a central role. At the base of this phenomena it is found the anisotropic energy injection due to the action of the turbulent structures involved in the near-wall cycle. The data used for the analysis are obtained with a pseudo-spectral code in a channel at Re τ = 550. The computational domain is 8πh × 2h × 4πh with a resolution in the homogeneous directions of Δx  +  = 13.5 and Δz  +  = 6.7.

Keywords

Streamwise Vortex Inertial Range Energy Cascade Energy Injection Velocity Increment 
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.
    Marati, N., Casciola, C.M., Piva, R.: Energy cascade and spatial fluxes in wall turbulence. J. Fluid Mech. 521 (2004)Google Scholar
  2. 2.
    Hill, R.J.: Exact second-order structure-function relationships. J. Fluid Mech. 468 (2002)Google Scholar
  3. 3.
    Casciola, C.M., Gualtieri, P., Benzi, R., Piva, R.: Scale-by-scale budget and similarity laws for shear turbulence. J. Fluid Mech. 476 (2003)Google Scholar
  4. 4.
    Jiménez, J., Pinelli, A.: The autonomous cycle of near-wall turbulence. J. Fluid Mech. 389 (1999)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.DIEMUniversità di BolognaBolognaItaly
  2. 2.DIMAUniversità di Roma “La Sapienza”RomaItaly

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