Turbulence is an Ineffective Mixer when Schmidt Numbers Are Large

Dhawal Buaria, Matthew P. Clay, Katepalli R. Sreenivasan, P. K. Yeung

Research output: Contribution to journalArticlepeer-review

Abstract

We solve the advection-diffusion equation for a stochastically stationary passive scalar θ, in conjunction with forced 3D Navier-Stokes equations, using direct numerical simulations in periodic domains of various sizes, the largest being 81923. The Taylor-scale Reynolds number varies in the range 140-650 and the Schmidt number Scν/D in the range 1-512, where ν is the kinematic viscosity of the fluid and D is the molecular diffusivity of θ. Our results show that turbulence becomes an ineffective mixer when Sc is large. First, the mean scalar dissipation rate ⟨χ

Original languageEnglish (US)
Article number074501
JournalPhysical Review Letters
Volume126
Issue number7
DOIs
StatePublished - Feb 19 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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