The detailed simulation of turbulent multiphase reacting
flows is of paramount importance for design, optimization,
and scale-up of relevant processes, such as: turbulent
combustion, diesel engines, fluidization and particle
technology, crystallization and precipitation processes.
There are many aspects that need to be taken into account
in order to properly model such flows. The fluid-dynamic
interaction between the primary and secondary phases is a
key factor, in fact, it determines turbulence intensity,
mixing rates, and mass and heat transfer. In the case of
reacting multiphase flows, this interaction has a strong
influence on reaction rates that, in turn, can heavily
affect the flow field (e.g., combustion).
Another key factor is the evolution of the secondary
phases. In turbulent multiphase reacting flows the
secondary phases are very often polydisperse, or in other
words, are distributed over several important properties
such as characteristic size, composition, and temperature.
The distribution continuously evolves because of the
chemical reactions and fluid motion, but in turn the
distribution itself strongly influences the flow and
turbulence fields and has a strong impact on the chemical
The course aims to describe the most widely applicable
modeling approaches and it is organized in six groups of
lectures covering from fundamentals to relevant
applications. In the first part of the course, some
fundamentals of multiphase turbulent reacting flows are
covered. In particular the introduction focuses on basic
notions of turbulence theory in single-phase and multi-
phase systems as well as on the interaction between
turbulence and chemistry. In the second part of the
course, models for the physical and chemical processes
involved are discussed. Among other things, particular
emphasis is given to turbulence modeling strategies for
multiphase flows based on the kinetic theory for
granular flows. Next, the different numerical methods
based on Lagrangian and/or Eulerian schemes are presented.
In particular the most popular numerical approaches of
computational fluid dynamics codes are described (i.e.,
Direct Numerical Simulation, Large Eddy Simulation, and
Reynolds-Averaged Navier-Stokes approach). The course will
cover particle-based methods such as lattice-Boltzmann and
dissipative particle dynamics and will also discuss
Eulerian-Eulerian and Eulerian-Lagrangian techniques based
on finite-volume schemes. Moreover, the possibility of
modeling the poly-dispersity of the secondary phases in
Eulerian-Eulerian schemes by solving the population
balance equation will be also discussed.
Six lecturers will be involved:
J. Derksen - Delft University of Technology, The
Netherlands: Particle-based methods for DNS/LES of
multiphase and turbulent reactive flows: the lattice-
Boltzmann method as a tool for simulating multiphase
flows, including liquid-solid and liquid-liquid
R.O. Fox - Iowa State University, USA: Introduction and
fundamentals of poly-disperse multiphase flows.
B.H. Hjertager - Aalborg University Esbjerg, Denmark:
Multi-fluid CFD modeling of chemical reactors.
D.L. Marchisio - Politecnico di Torino, Italy: Moment
methods for poly-disperse multiphase flows and RANS
modeling of reacting particulate systems.
M. Massot - Ecole Centrale Paris, France: Multi-fluid
modeling of the turbulent dispersion of polydisperse
J. Réveillon - University of Rouen, France: Mixture
fraction topology and flame structures in turbulent
spray combustion: simulation and modeling. How to use
direct numerical simulations to develop models for spray
dispersion, evaporation and turbulent combustion.