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Journal Articles Fluid Dynamics Research Year : 2019

Passive scalar mixing in modulated turbulence

Abstract

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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Dates and versions

hal-03158381 , version 1 (21-08-2023)

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Yuyao Yang, Robert Chahine, Robert Rubinstein, Wouter J.T. Bos. Passive scalar mixing in modulated turbulence. Fluid Dynamics Research, 2019, 51 (4), pp.045501. ⟨10.1088/1873-7005/ab1e66⟩. ⟨hal-03158381⟩
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