In various industrial applications, turbulence can be affected by
density variations resulting from different origins acting
simultaneously. This monograph is intended as a first attempt to
address variable density fluid turbulence in a unifying manner. It
is based on a rational approach, developed along a gradual analysis
of the complexity resulting from density fluctuations in
turbulence.
The first part aims at providing the physical and theoretical
framework of the analysis of density variations in fully turbulent
flows. Its scope is deliberately educational.
In the second part, basic data on dynamical and scalar properties
of variable density turbulent flows are presented and discussed,
based on experimental data and/or results from direct numerical
simulations. This part is rather concerned with a research
audience.
The last part is more directly devoted to an engineering audience
and deals with prediction methods for turbulent flows of variable
density fluid. Both first and second order, single point modeling
are discussed, with special emphasis on the capability to include
specific variable density / compressibility effects.
The main topics are:
-Physical aspects of variable density turbulent flows,
-General equations and Classification of variable density turbulent
flows,
-Statistical averaging in variable density fluids motions,
-Velocity and scalar structure in passive contaminant
turbulence,
-Basic Mechanisms in low speed variable denisty turbulence,
-The high speed free shear layer and Single point closure in
variable density fluid turbulence. The book is intended for a
rather wide audience, including postgraduate students, researchers
and engineers. Variable Density Fluid Turbulence should be of
interest to various domains of Mechanics, Energy and Environmental
Fluid Dynamics, such as Aerodynamics, Turbulence, Compressible
flows, Heat and Mass Transfer, Machinery Fluid Mechanics, Thermal
sciences
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