DNS study of the bending effect due to smoothing mechanism

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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-Stokes 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 S L depends linearly on the normalized rms velocity u 0 /S L . In the case of the reaction wave of a nonzero thickness, dependencies of the normalized bulk consumption velocity on u 0 /S L 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 δA F in the reaction-zone-surface area with increasing u 0 /S L . In its turn, the bending of the δA F (u 0 /S L )-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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Chalmers University of Technology
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Strömningsmekanik och akustik

Nyckelord

Originalspråkengelska
Artikelnummer31
TidskriftFluids
Volym4
Utgåva nummer1
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa