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Local dissipation scales and energy dissipation-rate moments in channel flow

Published online by Cambridge University Press:  10 May 2012

P. E. Hamlington
Affiliation:
Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429, USA
D. Krasnov
Affiliation:
Institut für Thermo- und Fluiddynamik, Technische Universität Ilmenau, Postfach 100565, D-98684 Ilmenau, Germany
T. Boeck
Affiliation:
Institut für Thermo- und Fluiddynamik, Technische Universität Ilmenau, Postfach 100565, D-98684 Ilmenau, Germany
J. Schumacher*
Affiliation:
Institut für Thermo- und Fluiddynamik, Technische Universität Ilmenau, Postfach 100565, D-98684 Ilmenau, Germany
*
Email address for correspondence: [email protected]

Abstract

Local dissipation-scale distributions and high-order statistics of the energy dissipation rate are examined in turbulent channel flow using very high-resolution direct numerical simulations at Reynolds numbers , and . For sufficiently large , the dissipation-scale distributions and energy dissipation moments in the channel bulk flow agree with those in homogeneous isotropic turbulence, including only a weak Reynolds-number dependence of both the finest and largest scales. Systematic, but -independent, variations in the distributions and moments arise as the wall is approached for . In the range , there are substantial differences in the moments between the lowest and the two larger values of . This is most likely caused by coherent vortices from the near-wall region, which fill the whole channel for low .

Type
Papers
Copyright
Copyright © Cambridge University Press 2012

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