Passive scalar mixing in modulated turbulence
Résumé
We investigate the mixing of a passive scalar in an isotropic turbulent flow in the presence of a time-periodic forcing. The results corroborate recent analytical predictions on the frequency dependence of the scalar variance and dissipation. In particular, when the modulation amplitude is large, it is shown that a low frequency modulation diminishes the mixing rate, whereas it enhances the transfer rate of kinetic energy, as compared to a flow with the same properties without an imposed temporal modulation of the forcing.
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