Direct numerical simulation (DNS) data are presented to study differentially diffusing
conserved scalars in isotropic turbulence. The two scalars are initially identical but …

The objectives of this paper are (i) to establish analytically some important features of the
scalar diffusion process in turbulence and (ii) to derive a closure model for this process in …

The differential diffusion of passive scalars of different molecular diffusivities is studied by
performing direct numerical simulations of scalar fields in statistically stationary isotropic …

The Lagrangian spectral relaxation (LSR) model is extended to treat turbulent mixing of two
passive scalars (φ α and φ β) with different molecular diffusivity coefficients (ie, differential …

A number of statistical measures of the differential diffusion of multiple scalars driven by
uniform mean gradients are studied by direct numerical simulation (DNS), in isotropic …

The diffusion term in the velocity gradient tensor Aij evolution equation in homogeneous
isotropic turbulence at moderate Reynolds number has been investigated using full direct …

In a companion paper, Ulitsky & Collins (2000) applied the eddy-damped quasi-normal
Markovian (EDQNM) turbulence theory to the mixing of two inert passive scalars with …

An attempt is made to assess the amplitude mapping closure for turbulent scalar fields. The
closure assumption is shown to be in very good agreement with the results obtained from …

The physical mechanisms underlying the dynamics of the dissipation of passive scalar
fluctuations with a uniform mean gradient in stationary isotropic turbulence are studied using …

A study of the Lagrangian statistical properties of velocity and passive scalar fields using
direct numerical simulations is presented, for the case of stationary isotropic turbulence with …