Journal
JOURNAL OF FLUID MECHANICS
Volume 772, Issue -, Pages 127-164Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2015.211
Keywords
flames; intermittency; turbulent reacting flows
Categories
Funding
- Swedish Research Council (VR)
- national Centre for Combustion Science and Technology (CeCOST)
- Swedish Energy Agency and Chalmers Combustion Engine Research Center (CERC)
- PRACE
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A 3D direct numerical simulation (DNS) study of the evolution of a self-propagating interface in forced constant-density statistically stationary homogeneous isotropic turbulence was performed by solving Navier-Stokes and level-set equations under a wide range of conditions that cover various (from 0.1 to 2.0) ratios of the interface speed S-L to the r.m.s. turbulent velocity U' and various (50, 100 and 200) turbulent Reynolds numbers Re. By analysing computed data, the following issues were addressed: (i) dependence of the speed and thickness of the fully developed statistically planar mean front that envelops the interface on U'/S-L and Re, (ii) dependence of the fully developed mean turbulent flux of a scalar c that characterizes the state of the fluid (c = 0 and 1 ahead and behind the interface respectively) on U'/S-L and Re, (iii) evolution of the mean front speed, its thickness, and the mean scalar flux during the front development after embedding a planar interface into the forced turbulence and (iv) relation between canonical and conditioned moments of the velocity, velocity gradient and pressure gradient fields.
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