Kinetic energy spectra and flux in turbulent phase-separating symmetric binary-fluid mixtures

Abstract

We conduct direct numerical simulation (DNS) of the Cahn-Hilliard-Navier-Stokes (CHNS) equations to investigate the statistical properties of the turbulent phase-separating symmetric binary-fluid mixture. Turbulence causes an arrest of the phase-separation which leads to the formation of a statistically steady emulsion. We characterize turbulent velocity fluctuations in an emulsion for different values of the Reynolds number and the Weber number. Our scale-by-scale kinetic energy budget analysis shows that the interfacial terms in the CHNS provide an alternate route for the kinetic energy transfer. By studying the probability distribution function (PDF) of the energy dissipation rate, the vorticity magnitude, and the joint-PDF of the velocity-gradient invariants we show that the statistics of the turbulent fluctuations do not change with the Weber number.

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• Modulation of homogeneous and isotropic turbulence in emulsions
• Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy driven bubbly flows
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• Turbulence modulation in buoyancy-driven bubbly flows
• Surface tension as the destabiliser of a vortical interface
• Energy transfer in simple and active binary fluid turbulence {\bf {-}} a false friend of incompressible MHD turbulence
• A revisit of generalized scaling of forced turbulence through flux analysis
• Scale-by-scale kinetic energy budgets in multiphase turbulence
• Interface-induced turbulence in viscous binary fluid mixtures
• Deformation of drops by outer eddies in turbulence
• Scale-by-scale energy transfers in bubbly flows