Dynamics of semi- and neutrally-buoyant particles in thermally stratified turbulent channel flow
Xinchen Zhang, Francesco Zonta, Zhao F Tian, Graham J Nathan, Rey C Chin, Alfredo Soldati
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2021
Stably-stratified flows are characterised by the presence of internal gravity waves (IGWs), which constitute a barrier for mass, heat, momentum and species vertical transport. In this paper, the dynamics of semi- and neutrally-buoyant particles in three-dimensional, stably-stratified turbulent channel flow is investigated, using direct numerical simulations (DNS), one-way coupled with a Lagrangian particle tracking (LPT) routine. The fluid is characterised by a shear Reynolds number Reτ=1000 and a shear Richardson number Riτ=200, such that the turbulence is sustained only in the near-wall region; whereas IGWs are observed at the core of the channel. Four sets of particles with a Stokes numbe..View full abstract
Awarded by Australian Research Council (ARC)
Awarded by Australian Renewable Energy Agency (ARENA)
Financial support for this collaboration project has been provided by the Australian Research Council (ARC, Grant number DP180102045), Australian Renewable Energy Agency (ARENA, Grant Number 2015/RND054) and the University of Adelaide Scholarship. The authors would like to acknowledge the Vienna Scientific Cluster (VSC) and Phoenix High-Performance Computing Centre for resource and technical support.