Particle imaging velocimetry experiments and lattice-Boltzmann simulations on a single sphere settling under gravity

A ten Cate*, CH Nieuwstad, JJ Derksen, HEA Van den Akker

*Corresponding author for this work

Research output: Contribution to journalArticle

227 Citations (Scopus)

Abstract

A comparison is made between experiments and simulations on a single sphere settling in silicon oil in a box. Cross-correlation particle imaging velocimetry measurements were carried out at particle Reynolds numbers ranging from 1.5 to 31.9. The particle Stokes number varied from 0.2 to 4 and at bottom impact no rebound was observed. Detailed data of the flow field induced by the settling sphere were obtained, along with time series of the sphere's trajectory and velocity during acceleration, steady fall and deceleration at bottom approach. Lattice-Boltzmann simulations prove to capture the full transient behavior of both the sphere motion and the fluid motion. The experimental data were used to assess the effect of spatial resolution in the simulations over a range of 2-8 grid nodes per sphere radius. The quality of the flow field predictions depends on the Reynolds number. When the sphere is very close to the bottom of the container, lubrication theory has been applied to compensate for the lack of spatial resolution in the simulations. (C) 2002 American Institute of Physics.

Original languageEnglish
Pages (from-to)4012-4025
Number of pages14
JournalPhysics of Fluids
Volume14
Issue number11
DOIs
Publication statusPublished - Nov 2002

Keywords

  • PARTICULATE SUSPENSIONS
  • BOUNDARY-CONDITIONS
  • NUMERICAL SIMULATIONS
  • REYNOLDS-NUMBER
  • FLUID
  • FLOWS
  • EQUATION
  • COLLISIONS
  • MODEL
  • WALL

Cite this