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Simulation of vortex core precession in a reverse‐flow cyclone
Author(s) -
Derksen J. J.,
Van den Akker H. E. A.
Publication year - 2000
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690460706
Subject(s) - strouhal number , vortex , reynolds number , precession , mechanics , lattice boltzmann methods , physics , cyclone (programming language) , large eddy simulation , turbulence , geometry , classical mechanics , meteorology , mathematics , engineering , condensed matter physics , field programmable gate array , embedded system
A large‐eddy simulation of the single‐phase turbulent flow in a model cyclone geometry on a uniform, cubic computational grid consisting of 4.9×10 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.