Entropy generation rate in turbulent spots in a boundary layer subject to freestream turbulence

  • Brendan Rehill
  • Ed J. Walsh
  • Kevin Nolan
  • Donald M. McEligot
  • Luca Brandt
  • Philipp Schlatter
  • Dan S. Henningson
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 18)

Abstract

Turbulent spots are studied in a boundary layer subject to freestream turbulence with the data taken from direct numerical simulations performed by Brandt et al.[2]. Additional simulations of artificially induced turbulent spots are investigated in a laminar and streaky boundary layer. The flow is seperated into turbulent and non-turbulent regions using a threshold of spanwise velocity, w. Mean velocity profiles within the spot show siginificant deviations from fully turbulent profiles. The dissipation coefficient, indicating the evolution of entropy generation within the spot, shows good agreement with previous correlations.

Keywords

Direct Numerical Simulation Entropy Generation Friction Velocity Vortex Pair Convection Velocity 
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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Brendan Rehill
    • 1
  • Ed J. Walsh
    • 1
  • Kevin Nolan
    • 1
  • Donald M. McEligot
    • 1
    • 2
  • Luca Brandt
    • 3
  • Philipp Schlatter
    • 3
  • Dan S. Henningson
    • 3
  1. 1.Stokes Research Institute, Mech. Aeronaut. Engr. Dept.Universtiy of LimerickLimerickIreland
  2. 2.Linné Flow Centre, KTH MechanicsStockholmSweden
  3. 3.Aero. Mech. Engr. Dept.Universtiy of ArizonaTucsonUSA

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