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 …

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

In this Brief Communication we describe a consistent method for calculating the conditional
scalar dissipation (or diffusion) rate for inhomogeneous turbulent flows. The model follows …

A methodology for modeling passive scalar mixing in homogeneous turbulence using a new
mapping closure approach is developed. The physical scalar field φ (y, t)(y‐space …

A closed model equation is derived which describes the evolution of the single-point, joint
probability density function of a reacting scalar and its gradient in a turbulent advection field …

In 1921 GI Taylor introduced (with little discussion) the notion that the dispersion of a
conserved passive scalar in a turbulent flow is determined by the motion of fluid particles …

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 new method for calculating the conditional scalar dissipation rate< N| η> is derived from
the probability density function (pdf) transport equation for the conserved scalar Z. Two …

Transport and mixing of diffusive scalars in turbulent flows are simulated computationally
based on a novel representation of the temporal evolution along a transverse line moving …

The evolution of scalar fields, of different initial integral length scales, in statistically
stationary, homogeneous, isotropic turbulence is studied. The initial scalar fields conform …