Simulation of vortex core precession in a reverse-flow cyclone

JJ Derksen*, HEA Van den Akker

*Corresponding author for this work

Research output: Contribution to journalArticle

171 Citations (Scopus)

Abstract

A large-eddy simulation of the single-phase turbulent flow in a model cyclone geometry on a uniform, cubic computational grid consisting of 4.9 x 10(6) cells was performed. The Navier-Stokes equations were discretized according to a lattice-Boltzmann scheme. The Reynolds number, based on the inlet velocity and the cyclone body diameter, was 14,000. A standard Smagorinsky subgrid-scale model with c(s) = 0.1, including wall-damping functions, was applied. The 3-D, average flow field was predicted with a high level of accuracy. Furthermore, the simulations exhibit vortex-core precession, that is, the core of the main vortex is observed to move about the geometrical axis of the cyclone in a quasi-periodic manner. The Strouhal number associated with the simulated vortex-core precession was 0.53, whereas 0.49 was experimentally observed in a similar geometry at approximately the same Reynolds number.

Original languageEnglish
Pages (from-to)1317-1331
Number of pages15
JournalAIChE Journal
Volume46
Issue number7
Publication statusPublished - Jul 2000

Keywords

  • LATTICE-BOLTZMANN SCHEME
  • NAVIER-STOKES EQUATION
  • LARGE-EDDY SIMULATION
  • DUST SEPARATOR
  • GAS CYCLONES
  • FLUID-FLOW
  • AUTOMATA
  • EXHAUST

Cite this