Extending the Langevin model to variable-density pressure-gradient-driven turbulence

@article{Bakosi2011ExtendingTL,
  title={Extending the Langevin model to variable-density pressure-gradient-driven turbulence},
  author={J{\'o}zsef Bakosi and J. Raymond Ristorcelli},
  journal={Journal of Turbulence},
  year={2011}
}
We extend the generalized Langevin model (D.C. Haworth and S.B. Pope, A generalized Langevin model for turbulent flows, Phys. Fluids 29 (1986) p. 387), originally developed for the Lagrangian fluid particle velocity in constant-density shear-driven turbulence, to variable-density (VD) pressure-gradient-driven flows. VD effects due to nonuniform mass concentrations (e.g. mixing of different species) are considered. In the extended model, large density fluctuations leading to large differential… 
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References

SHOWING 1-10 OF 37 REFERENCES
Probability density function method for variable-density pressure-gradient-driven turbulence and mixing
Probability density function (PDF) methods are extended to variable-density pressure-gradient-driven turbulence. We apply the new method to compute the joint PDF of density and velocity in a
Mixing asymmetry in variable density turbulence
Molecular mixing as a consequence of stirring by turbulence is an important process in many practical applications. If the microscopic densities of the fluids participating in the mixing are very
Advances in PDF modeling for inhomogeneous turbulent flows
Probability density function (PDF) models which are based on an exact representation of rapidly distorting homogeneous turbulence are applied to a free shear flow, the temporal mixing layer. These
Variable-density mixing in buoyancy-driven turbulence
The homogenization of a heterogeneous mixture of two pure fluids with different densities by molecular diffusion and stirring induced by buoyancy-generated motions, as occurs in the Rayleigh–Taylor
Buoyancy-driven variable-density turbulence
Buoyancy-generated motions in an unstably stratified medium composed of two incompressible miscible fluids with different densities, as occurs in the variable-density Rayleigh–Taylor instability, are
Exploring the beta distribution in variable-density turbulent mixing
In assumed probability density function (PDF) methods of turbulent combustion, the shape of the scalar PDF is assumed a priori and the PDF is parametrized by its moments for which model equations are
New phenomena in variable-density Rayleigh–Taylor turbulence
This paper presents several issues related to mixing and turbulence structure in buoyancy-driven turbulence at low to moderate Atwood numbers, A, found from direct numerical simulations in two
Turbulence transport equations for variable-density turbulence and their relationship to two-field models
This study gives an updated account of our current ability to describe multimaterial compressible turbulent flows by means of a one-point transport model. Evolution equations are developed for a
Direct numerical simulation and large-eddy simulation of stationary buoyancy-driven turbulence
We report direct numerical simulation (DNS) and large-eddy simulation (LES) of statistically stationary buoyancy-driven turbulent mixing of an active scalar. We use an adaptation of the fringe-region
Experiments in nearly homogenous turbulent shear flow with a uniform mean temperature gradient. Part 1
A reasonably uniform mean temperature gradient has been superimposed upon a nearly homogeneous turbulent shear flow in a wind tunnel. The overheat is small enough to have negligible effect on the
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