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Study of Energetics in Drag-Reduced Turbulent Channel Flows

  • Davide GattiEmail author
  • Maurizio Quadrio
  • Andrea Cimarelli
  • Yosuke Hasegawa
  • Bettina Frohnapfel
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 196)

Abstract

Changes in integral power budgets and scale energy fluxes as induced by certain active flow control strategies for turbulent skin-friction drag reduction are studied by performing Direct Numerical Simulation of turbulent channels. The innovative feature of the present study is that the flow is driven at Constant total Power Input (CtPI), which is a necessary enabling choice in order to meaningfully compare a reference unmanipulated flow with a modified one from the energetic standpoint. Spanwise wall oscillation and opposition control are adopted as model strategies, because of their very different control input power requirements. The global power budget show that the increase of dissipation of mean kinetic energy is not always related to drag reduction, while the preliminary analysis of the scale energy fluxes through the generalized Kolmogorov equation shows that the space- and scale properties of the scale energy source and fluxes are significantly modified in the near-wall region, while remain unaltered elsewhere.

Notes

Acknowledgements

Support through the DFG project FR2823/5-1 is gratefully acknowledged. Computing time has been provided by the comutaional resource ForHLR Phase I funded by the Ministry of Science, Research and the Arts, Baden-Wrttemberg and DFG (Deutsche Forschungsgemeinschaft).

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Davide Gatti
    • 1
    Email author
  • Maurizio Quadrio
    • 2
  • Andrea Cimarelli
    • 3
  • Yosuke Hasegawa
    • 4
  • Bettina Frohnapfel
    • 1
  1. 1.Karlsruhe Institute of TechnologyKarlsruheGermany
  2. 2.Politecnico di MilanoMilanoItaly
  3. 3.Università Degli Studi di Modena e Reggio EmiliaModenaItaly
  4. 4.University of TokyoTokyoJapan

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