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Reaction-induced departures from continuum Navier-Stokes turbulence.

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Area of Science:

  • Fluid dynamics
  • Chemical kinetics
  • Computational physics

Background:

  • Reactive hydrodynamic turbulence is multiscale, with scales from energy-containing to molecular.
  • The Navier-Stokes (NS) equations macroscopically describe turbulence, assuming scale separation.

Purpose of the Study:

  • To investigate the breakdown of NS equations in reactive turbulence.
  • To explore the impact of exothermic reactions on turbulence at the molecular level.

Main Methods:

  • Molecular-level simulations were employed.
  • Analysis focused on the near-continuum regime of reactive flow.

Main Results:

  • Exothermic bimolecular reactions were shown to cause NS breakdown.
  • Reactive collisions distorted velocity distribution functions and kinetic energy transfer.
  • Departures from NS were observed at large scales, impacting turbulence kinetic energy.

Conclusions:

  • The NS description is inadequate for reactive turbulence under certain conditions.
  • Molecular nonequilibrium significantly affects macroscopic turbulence properties.