A Lagrangian probability-density-function model for collisional turbulent fluid–particle flows

@article{Innocenti2019ALP,
  title={A Lagrangian probability-density-function model for collisional turbulent fluid–particle flows},
  author={Alessio Innocenti and Rodney O. Fox and Maria Vittoria Salvetti and Sergio Chibbaro},
  journal={Journal of Fluid Mechanics},
  year={2019},
  volume={862},
  pages={449 - 489}
}
Inertial particles in turbulent flows are characterised by preferential concentration and segregation and, at sufficient mass loading, dense particle clusters may spontaneously arise due to momentum coupling between the phases. These clusters, in turn, can generate and sustain turbulence in the fluid phase, which we refer to as cluster-induced turbulence (CIT). In the present work, we tackle the problem of developing a framework for the stochastic modelling of moderately dense particle-laden… 
A Lagrangian probability-density-function model for turbulent particle-laden channel flow in the dense regime
Modeling particle-laden turbulent flows at high volume fractions requires accounting for the coupling between phases. The latter is often a sensitive point, and proper closure of the exchange and
A methodology to devise consistent probability density function models for particle dynamics in turbulent dispersed two-phase flows
The purpose of this article is to propose a generic methodology to build consistent Lagrangian models for polydisperse turbulent two-phase flows where the main issue is to devise a stochastic model
Turbulent scalar fluxes from a generalized Langevin model: Implications on mean scalar mixing and tracer particle dispersion
A Generalized Langevin Model (GLM) formulation to be used in transported joint velocity-scalar probability density function methods is recalled in order to imply a turbulent scalar-flux model where
Small-scale flow topologies, pseudo-turbulence, and impact on filtered drag models in turbulent fluidization
The small-scale flow topologies in a moderately dense (gas-particle) turbulent fluidization have been investigated using highly-resolved Eulerian two-fluid model simulations. Enhanced contraction of
Sparse identification of multiphase turbulence closures for coupled fluid–particle flows
Abstract In this work, model closures of the multiphase Reynolds-averaged Navier–Stokes (RANS) equations are developed for homogeneous, fully developed gas–particle flows. To date, the majority of

References

SHOWING 1-10 OF 100 REFERENCES
On fluid–particle dynamics in fully developed cluster-induced turbulence
At sufficient mass loading and in the presence of a mean body force (e.g. gravity), an initially random distribution of particles may organize into dense clusters as a result of momentum coupling
Strongly coupled fluid-particle flows in vertical channels. II. Turbulence modeling
In Part I, simulations of strongly coupled fluid-particle flow in a vertical channel were performed with the purpose of understanding, in general, the fundamental physics of wall-bounded multiphase
Numerical study of collisional particle dynamics in cluster-induced turbulence
Abstract We present a computational study of cluster-induced turbulence (CIT), where the production of fluid-phase kinetic energy results entirely from momentum coupling with finite-size inertial
Strongly coupled fluid-particle flows in vertical channels. I. Reynolds-averaged two-phase turbulence statistics
Simulations of strongly coupled (i.e., high-mass-loading) fluid-particle flows in vertical channels are performed with the purpose of understanding the fundamental physics of wall-bounded multiphase
Partitioning of particle velocities in gas-solid turbulent flows into a continuous field and a spatially uncorrelated random distribution : theoretical formalism and numerical study
The velocity distribution of dilute suspensions of heavy particles in gas–solid turbulent flows is investigated. A statistical approach – the mesoscopic Eulerian formalism (MEF) – is developed in
On multiphase turbulence models for collisional fluid–particle flows
  • R. Fox
  • Physics, Engineering
    Journal of Fluid Mechanics
  • 2014
Abstract Starting from a kinetic theory (KT) model for monodisperse granular flow, the exact Reynolds-averaged (RA) equations are derived for the particle phase in a collisional fluid–particle flow.
Small particles in homogeneous turbulence: Settling velocity enhancement by two-way coupling
The gravitational settling of an initially random suspension of small solid particles in homogeneous turbulence is investigated numerically. The simulations are based on a pseudospectral method to
Lagrangian filtered density function for LES-based stochastic modelling of turbulent dispersed flows
The Eulerian-Lagrangian approach based on Large-Eddy Simulation (LES) is one of the most promising and viable numerical tools to study turbulent dispersed flows when the computational cost of Direct
A numerical study of the modulation of isotropic turbulence by suspended particles
Direct numerical simulations of a turbulent fluid laden with finite-sized particles are performed. The computations, on a 1283 grid along with a maximum of 262 144 particles, incorporated both direct
Turbulence modulation in heavy-loaded suspensions of tiny particles
The features of turbulence modulation produced by a heavy loaded suspension of small solid particles or liquid droplets are discussed by using a physically-based regularisation of particle-fluid
...
1
2
3
4
5
...