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 …

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 …

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 modelling of differential diffusion with a conditional moment closure (CMC) method is
considered. Direct numerical simulations for scalar fields in homogeneous isotropic …

Scalar mixing models are required to model turbulent molecular mixing in full probability
density function (pdf) simulations of turbulent reacting flows. Despite the existence of direct …

The consistency of the conditional variance and covariance equations derived by the
decomposition method and by the probability density function method are addressed in this …

Mixing of a passive scalar in statistically homogeneous, isotropic, and stationary turbulence
with a mean scalar gradient is investigated via direct numerical simulation, for Taylor-scale …

On the basis of the two-point velocity correlation equation a new tensor length-scale
equation and in turn a dissipation rate tensor equation and the pressure–strain correlation …

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 …

It is shown that measurements of lower‐dimensional projections of the scalar gradient in an
isotropic conserved scalar field ζ (x, t) are sufficient to construct the probability density …