%0 Journal Article
%T DNS Study of the Bending Effect Due to Smoothing Mechanism
%A Andrei N. Lipatnikov
%A Rixin Yu
%J -
%D 2019
%R https://doi.org/10.3390/fluids4010031
%X Abstract Propagation of either an infinitely thin interface or a reaction wave of a nonzero thickness in forced, constant-density, statistically stationary, homogeneous, isotropic turbulence is simulated by solving unsteady 3D Navier¨CStokes equations and either a level set (G) or a reaction-diffusion equation, respectively, with all other things being equal. In the case of the interface, the fully developed bulk consumption velocity normalized using the laminar-wave speed SL depends linearly on the normalized rms velocity u¡ä/SL. In the case of the reaction wave of a nonzero thickness, dependencies of the normalized bulk consumption velocity on u¡ä/SL show bending, with the effect being increased by a ratio of the laminar-wave thickness to the turbulence length scale. The obtained bending effect is controlled by a decrease in the rate of an increase ¦ÄAF in the reaction-zone-surface area with increasing u¡ä/SL. In its turn, the bending of the ¦ÄAF(u¡ä/SL)-curves stems from inefficiency of small-scale turbulent eddies in wrinkling the reaction-zone surface, because such small-scale wrinkles characterized by a high local curvature are smoothed out by molecular transport within the reaction wave. View Full-Tex
%K reaction waves
%K turbulent reacting flows
%K turbulent consumption velocity
%K bending effect
%K reaction surface area
%K molecular transport
%K direct numerical simulations
%U https://www.mdpi.com/2311-5521/4/1/31