Modeling of the Joint PDF of a Scalar and Its Gradient in Turbulent Mixing

A joint probability distribution function of a conservative scalar (mixture fraction) and its gradient is predicted numerically. Statistical moments of this function are compared to their approximations, direct numerical simulation data, and also to the results obtained by simplified models for a co...

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Bibliographic Details
Published in:Flow, turbulence and combustion turbulence and combustion, 2009-03, Vol.82 (2), p.211-231
Main Authors: Babenko, V., Stavrov, A.
Format: Article
Language:English
Subjects:
Applied sciences
Automotive Engineering
Combustion. Flame
Energy
Energy. Thermal use of fuels
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Exact sciences and technology
Fluid dynamics
Fluid- and Aerodynamics
Fundamental areas of phenomenology (including applications)
Heat and Mass Transfer
Isotropic turbulence
homogeneous turbulence
Physics
Theoretical studies
Theoretical studies. Data and constants. Metering
Turbulent flows, convection, and heat transfer
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Description
Summary:A joint probability distribution function of a conservative scalar (mixture fraction) and its gradient is predicted numerically. Statistical moments of this function are compared to their approximations, direct numerical simulation data, and also to the results obtained by simplified models for a conditional rate of scalar dissipation, the surface density function, and the one-point PDF of scalar fluctuation under homogeneous isotropic turbulence. The results allow to evaluate the performance of existing statistical micromixing models.
ISSN:1386-6184
1573-1987
DOI:10.1007/s10494-008-9166-y