Campus Units

Chemical and Biological Engineering

Document Type

Article

Research Focus Area

Computational Fluid Dynamics

Publication Version

Published Version

Publication Date

5-10-2021

Journal or Book Title

Physics of Fluids

Volume

33

Issue

5

First Page

053308

DOI

10.1063/5.0045690

Abstract

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 production terms due to the presence of particles is not straightforward. In the present work, a Lagrangian probability-density-function model developed for homogeneous cluster-induced turbulence is extended to a channel flow. The key features are consistent two-way coupling and the decomposition of the particle velocity into spatially correlated and uncorrelated components, which is crucial for dense flows and which allows dealing with collisions from a statistical point of view. A numerical scheme for the coupled solution of the stochastic differential equations for the particles and a Reynolds-stress model for the fluid is developed. Tests with tracer particles without two-way coupling are done to assess the validity and the consistency of the numerical scheme. Finally, two sets of numerical simulations with particles with different diameters in a turbulent channel flow at a shear Reynolds of [Math Processing Error] are reported. The effect of two-way coupling by varying the mass loading of the dispersed phase in the mass-loading range [Math Processing Error] 0–2 is analyzed, and the results are compared to previous Eulerian–Lagrangian and Eulerian–Eulerian direct-numerical simulation (DNS) studies. Mean velocities and turbulent kinetic energy show good agreement with DNS, especially regarding the trend with respect to mass loading. Consistent with prior work, increased mass loading causes a drastic reduction of turbulent kinetic energy in the range [Math Processing Error] 0–2.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Innocenti, Alessio, Rodney O. Fox, and Sergio Chibbaro. "A Lagrangian probability-density-function model for turbulent particle-laden channel flow in the dense regime." Physics of Fluids 33, no. 5 (2021): 053308. and may be found at DOI: 10.1063/5.0045690. Posted with permission.

Copyright Owner

The Author(s)

Language

en

File Format

application/pdf

Available for download on Tuesday, May 10, 2022

Share

COinS