Dissipation-scale fluctuations in the inner region of turbulent channel flow

Affiliation
Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington D.C. 20375, USA
Hamlington, P E;
GND
1202816703
Affiliation
Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, PO Box 100565, D-98684 Ilmenau, Germany
Krasnov, D;
GND
122306538
Affiliation
Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, PO Box 100565, D-98684 Ilmenau, Germany
Boeck, T;
GND
118040839
Affiliation
Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, PO Box 100565, D-98684 Ilmenau, Germany
Schumacher, J

The statistics of intense energy dissipation events in wall-bounded shear flows are studied using highly resolved direct numerical simulations of turbulent channel flow at three different friction Reynolds numbers. Distributions of the energy dissipation rate and local dissipation scales are computed at various distances from the channel walls, with an emphasis on the behavior of the statistics in the near-wall region. The dependence of characteristic mean and local dissipation scales on wall distance is also examined over the full channel height. Systematic variations in these statistics are found close to the walls due to the anisotropy generated by mean shear and coherent vortical structures. Results near the channel centerline are consistent with those found in homogeneous isotropic turbulence.

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License Holder: Published under licence by IOP Publishing Ltd

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This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.