Published online by Cambridge University Press: 29 April 2015
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
 $S_{L}$  to the r.m.s. turbulent velocity    $U^{\prime }$  and various (50, 100 and 200) turbulent Reynolds numbers
 $U^{\prime }$  and various (50, 100 and 200) turbulent Reynolds numbers   $\mathit{Re}$ . 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
 $\mathit{Re}$ . 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   $U^{\prime }/S_{L}$  and
 $U^{\prime }/S_{L}$  and   $\mathit{Re}$ , (ii) dependence of the fully developed mean turbulent flux of a scalar
 $\mathit{Re}$ , (ii) dependence of the fully developed mean turbulent flux of a scalar   $c$  that characterizes the state of the fluid (
 $c$  that characterizes the state of the fluid (  $c=0$  and 1 ahead and behind the interface respectively) on
 $c=0$  and 1 ahead and behind the interface respectively) on   $U^{\prime }/S_{L}$  and
 $U^{\prime }/S_{L}$  and   $\mathit{Re}$ , (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.
 $\mathit{Re}$ , (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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