Turbulent scalar fluxes from a generalized Langevin model: Implications on mean scalar mixing and tracer particle dispersion

Turbulent mixing of a passive scalar

The statistically stationary state of a turbulently advected passive scalar is studied, with an imposed linear mean gradient in two dimensions, via a number of numerical experiments. For a synthetic Gaussian velocity field, which is generated by a linear stochastic process, and whose spectra and Eulerian correlation time follow Kolmogorov scaling on all scales, the exponents of the scalar spect...

On the anisotropy of the turbulent passive scalar in the presence of a mean scalar gradient

We investigate the origin of the scalar gradient skewness in isotropic turbulence on which a mean scalar gradient is imposed. The problem of the advection of an anisotropic scalar field is reformulated in terms of the advection of an isotropic vector field. For this field triadic closure equations are derived. It is shown how the scaling of the scalar gradient skewness depends on the choice of ...

Title of Dissertation : PASSIVE SCALAR DISPERSION IN A TURBULENT MIXING LAYER

Title of Dissertation: PASSIVE SCALAR DISPERSION IN A TURBULENT MIXING LAYER Ning Li, Doctor of Philosophy, 2004 Dissertation directed by: Professor James M. Wallace Department of Mechanical Engineering Experimental and numerical studies of spatially developed turbulent mixing layers with passive scalar concentrations was performed. In the experiment, a mixing layer was created by an S-shaped s...

Modeling multiple reactive scalar mixing with the generalized IEM model

Mixing of Scalar Glueball and Scalar Quarkonia

The isosinglet scalar mesons f0(1710), f0(1500), f0(1370) and their mixing are studied. Two recent lattice results are employed as the starting point; one is the approximate SU(3) symmetry in the scalar sector above 1 GeV for the connected insertion part without qq̄ annihilation, and the other is the scalar glueball mass at 1710 MeV in the quenched approximation. In the SU(3) symmetry limit, f0(...