The Formation and Evolution of Turbulent Swirling Vortex Rings Generated by Axial Swirlers
Sign Up to like & getrecommendations! Published in 2019 at "Flow, Turbulence and Combustion"
DOI: 10.1007/s10494-019-00076-2
Abstract: The present work investigates the formation process and early stage evolution of turbulent swirling vortex rings, by using planar Particle Image Velocimetry (PIV) and Large Eddy Simulation (LES). Vortex rings are produced in a piston-nozzle… read more here.
Keywords: swirling vortex; evolution; axial swirlers; evolution turbulent ... See more keywords
A computational study of vortex rings interacting with a constant-temperature heated wall
Sign Up to like & getrecommendations! Published in 2019 at "International Journal of Heat and Fluid Flow"
DOI: 10.1016/j.ijheatfluidflow.2019.02.006
Abstract: Abstract This study is motivated by understanding the connections between the vortical structures in impinging jets and the wall heat transfer. Of particular interest are: (1) examining how the stage of evolution of vortex pairing… read more here.
Keywords: vortex rings; case; heat transfer; wall ... See more keywords
On the scaling of propagation of periodically generated vortex rings
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2018.529
Abstract: The propagation of periodically generated vortex rings (period $T$ ) is numerically investigated by imposing pulsed jets of velocity $U_{jet}$ and duration $T_{s}$ (no flow between pulses) at the inlet of a cylinder of diameter… read more here.
Keywords: propagation periodically; jet; generated vortex; ast ... See more keywords
Topology of interacting coiled vortex rings
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2018.665
Abstract: Pairs of nested vortex rings, one with coils, are evolved numerically to compare their topological numbers to those of recent experiments reported in Scheeler et al. (Science, vol. 357, 2017, pp. 487–491). Included are the… read more here.
Keywords: stix x1d6e4; helicities mathcal; topology; topology interacting ... See more keywords
Formation regimes of vortex rings in thermals
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.1036
Abstract: The development of laminar thermals and the formation of buoyant vortex rings in thermals are studied by performing direct numerical simulations. The formation number of buoyant vortex rings in thermals is also analysed. We find… read more here.
Keywords: vortex ring; vortex; formation; number ... See more keywords
Inviscid and viscous global stability of vortex rings
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2020.581
Abstract: Abstract We perform inviscid and viscous, global, linear stability analyses of vortex rings which are compared with asymptotic theories and numerical simulations. We find growth rates of rings to be very sensitive to the details… read more here.
Keywords: growth rates; inviscid viscous; viscous global; asymptotic theories ... See more keywords
Vortex rings produced by non-parallel planar starting jets
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2020.637
Abstract: Abstract Experimental methods are employed to investigate vortex rings generated by impulsively emitting pressurised air through a rectangular outlet of high aspect ratio into quiescent surroundings. The flow is characterised by a rapid transverse expansion… read more here.
Keywords: planar starting; parallel planar; non parallel; starting jets ... See more keywords
An experimental study of turbulent vortex rings in superfluid 4He
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2020.96
Abstract: Macroscopic vortex rings are generated thermally in superfluid 4He, between 1.28 and 1.95 K, by applying a brief voltage pulse to a resistive heater located below a circular vertical tube 5 mm in diameter and… read more here.
Keywords: experimental study; turbulent vortex; study turbulent; superfluid 4he ... See more keywords
Experimental observation of vortex rings in a bulk magnet
Sign Up to like & getrecommendations! Published in 2020 at "Nature Physics"
DOI: 10.1038/s41567-020-01057-3
Abstract: Vortex rings are remarkably stable structures occurring in numerous systems: for example in turbulent gases, where they are at the origin of weather phenomena [1]; in fluids with implications for biology [2]; in electromagnetic discharges… read more here.
Keywords: vortex rings; observation vortex; three dimensional; vortex ... See more keywords
Vortex rings from high energy central p+A collisions
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DOI: 10.1103/physrevc.104.l011901
Abstract: Michael Annan Lisa,1 João Guilherme Prado Barbon,2 David Dobrigkeit Chinellato,2 Willian Matioli Serenone,2 Chun Shen,3, 4 Jun Takahashi,2 and Giorgio Torrieri2 The Ohio State University, Columbus, Ohio, USA Instituto de Física Gleb Wataghin, Universidade Estadual… read more here.
Keywords: rings high; central collisions; energy central; vortex rings ... See more keywords
Scaling of the translational velocity of vortex rings behind conical objects
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review Fluids"
DOI: 10.1103/physrevfluids.6.024701
Abstract: The study of vortex rings formed behind accelerating bluff bodies is necessary to reduce their harmful effects or harvest their potential. The scaling of the vortex growth is usually performed by comparing the vortex circulation… read more here.
Keywords: velocity vortex; velocity; rings behind; vortex rings ... See more keywords