Abstract
Particle-laden turbulent flows occur in a variety of industrial applications as well as in naturally occurring flows. While the numerical simulation of such flows has seen significant advances in recent years, it still remains a challenging problem. Many studies investigated the rheology of dense suspensions in laminar flows as well as the dynamics of point-particles in turbulence. Here we employ a fully-resolved numerical simulation based on a lattice Boltzmann scheme, to investigate turbulent flow with large neutrally buoyant particles in a pipe flow at low Reynolds number and in dilute regimes. The energy input is kept fixed resulting in a Reynolds number based on the friction velocity around 250. Two different particle radii were used giving a particle-pipe diameter ratio of 0.05 and 0.075. The number of particles is kept constant resulting in a volume fraction of 0.54% and 1.83%, respectively. We investigated Eulerian and Lagrangian statistics along with the stresslet exerted by the fluid on the spherical particles. It was observed that the high particle-to-fluid slip velocity close to the wall corresponds locally to events of high energy dissipation, which are not present in the single-phase flow. The migration of particles from the inner to the outer region of the pipe, the dependence of the stresslet on the particle radial positions and a proxy for the fragmentation rate of the particles computed using the stresslet have been investigated.
| Original language | English |
|---|---|
| Article number | 34 |
| Pages (from-to) | 34 |
| Number of pages | 17 |
| Journal | European Physical Journal E |
| Volume | 41 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2018 |
Funding
This work is part of the Industrial Partnership Programme (IPP) Computational Sciences for Energy Research of the (former) Foundation for Fundamental Research on Matter (FOM), which is (now) part of the Netherlands Organization for Scientific Research (NWO). This research programme is cofinanced by Shell Global Solutions International B.V. The authors gratefully acknowledge the support of the NWO for the use of supercomputer facilities (Cartesius) under Grant No. SH-334-15. The authors would also like to thank Matthäus U. Bäbler from KTH Royal Institute of Technology and Wim-Paul Breugem from TU Delft for the interesting scientific discussions. Finally, the authors would like to thank their colleagues Gianluca Di Staso and Pinaki Kumar from TU Eindhoven for the numerous scientific discussions that greatly helped to improve the quality of the manuscript and to Xiao Xue for improving the particle update algorithm.
Keywords
- Topical issue: Fluids and Structures: Multi-scale coupling and modeling