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Title: Vortex ring with swirl: A numerical study
Authors: Cheng, M.
Lou, J.
Lim, T.T. 
Issue Date: 30-Sep-2010
Citation: Cheng, M., Lou, J., Lim, T.T. (2010-09-30). Vortex ring with swirl: A numerical study. Physics of Fluids 22 (9) : -. ScholarBank@NUS Repository.
Abstract: In this paper, we use a lattice Boltzmann method to study the effect of swirl on the dynamics of an isolated three-dimensional vortex ring in a viscous incompressible fluid. We focus on a fixed Reynolds number of 800 and vary swirl magnitude and vortex core size. Results show that increasing swirl for a fixed core size or increasing core size for a fixed swirl causes vortex ring to slow down or even travel backward initially. A simplified physical explanation for this dynamic behavior is proposed. Our results further show that while a weak swirl causes vortex filaments to undergo helical winding, a sufficiently strong swirl transforms these windings into convoluted three-dimensional vortex structure with vortex loops trailing behind it. Each of these vortex loops may reconnect with itself, through the process of vortex reconnection, to form a ringlet. © 2010 American Institute of Physics.
Source Title: Physics of Fluids
ISSN: 10706631
DOI: 10.1063/1.3478976
Appears in Collections:Staff Publications

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