Emergence of small scales in vortex ring collisions

McKeown, Ryan; Ostilla–Mónico, Rodolfo; Pumir, Alain; Brenner, Michael P.; Rubinstein, Shmuel M.

doi:10.1103/physrevfluids.3.100509

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…The peaks spread with time, being clearly visible during several hundred picoseconds more. It is worth noticing that in a recent paper, the head-on collision of a pair of smoke vortex-antivortex rings has been visualized [69], as well as their ultimate breakdown yielding a burst of sound waves similar to that we have found for rotons, stressing its connection to the appearance of classical turbulence.…”

Section: B Vorticity and Energy Spectrumsupporting

confidence: 61%

Merging of superfluid helium nanodroplets with vortices

et al. 2022

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Within density functional theory, we have investigated the coalescence dynamics of two superfluid helium nanodroplets hosting vortex lines in different relative orientations, which are drawn towards each other by the Van der Waals mutual attraction. We have found a rich phenomenology depending on how the vortex lines are oriented. In particular, when a vortex and antivortex lines are present in the merging droplets, a dark soliton develops at the droplet contact region, which eventually decays into vortex rings. Reconnection events are observed between the vortex lines or rings, leading to the creation of more vortices. Our simulations show the interplay between vortex creation and reconnections, as well as the effect of the droplet surface which pins the vortex ends and, by reflecting short-wavelength excitations produced by the interactions between vortices, strongly affects the droplet final state. Additional vorticity is nucleated in the proximity of surface indentations produced in the course of the dynamics, which in turn interact with other vortices present in the droplets. These effects, obviously absent in the case of bulk liquid helium, show that the droplet surface may act as a multiplier of vortex reconnections. The analysis of the energy spectrum shows that vortex-antivortex ring annihilation, as well as vortex-antivortex reconnections, yields roton bursts of different intensity.

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Section: B Vorticity and Energy Spectrumsupporting

confidence: 61%

Merging of superfluid helium nanodroplets with vortices

et al. 2022

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show abstract

“…The peaks spread with time, being clearly visible during several hundred picoseconds more. It is worth noticing that in a recent paper, the head-on collision of a pair of smoke vortex-antivortex rings has been visualized, 67 as well as their ultimate breakdown yielding a burst of sound waves similar to that we have found for rotons, stressing its connection to the appearance of classical turbulence.…”

Section: B Vorticity and Energy Spectrumsupporting

confidence: 60%

Merging of superfluid Helium nanodroplets with vortices

Escartin,

Ancilotto,

Barranco

et al. 2021

Preprint

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Within Density Functional Theory, we have investigated the coalescence dynamics of two superfluid helium nanodroplets hosting vortex lines in different relative orientations, which are drawn towards each other by the Van der Waals mutual attraction. We have found a rich phenomenology depending on how the vortex lines are oriented. In particular, when a vortex and anti-vortex lines are present in the merging droplets, a dark soliton develops at the droplet contact region, which eventually decays into vortex rings. Reconnection events are observed between the vortex lines or rings, leading to the creation of more vortices. Our simulations show the interplay between vortex creation and reconnections, as well as the effect of the droplet surface which pins the vortex ends and, by reflecting short-wavelength excitations produced by the interactions between vortices, strongly affects the droplet final state. Additional vorticity is nucleated in the proximity of surface indentations produced in the course of the dynamics, which in turn interact with other vortices present in the droplets. These effects, obviously absent in the case of bulk liquid helium, show that the droplet surface may act as a multiplier of vortex reconnections. The analysis of the energy spectrum shows that vortex-antivortex ring annihilation, as well as vortex-antivortex reconnections, yields roton bursts of different intensity.

show abstract

“…In 1992, Lim and Nickels, from Melbourne, performed an extraordinary experiment on the instability and reconnection of opposite circulation vortex rings aligned in a perfect head-on scattering [1,2,3]. The experiment, done in water, consisted on the head-on collision of two equal circular vortex.…”

Section: Introductionmentioning

confidence: 99%

Self-similar vortex reconnection

Rica¹

2019

Comptes Rendus. Mécanique

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Emergence of small scales in vortex ring collisions

Cited by 8 publications

References 3 publications

Merging of superfluid helium nanodroplets with vortices

Merging of superfluid helium nanodroplets with vortices

Merging of superfluid Helium nanodroplets with vortices

Self-similar vortex reconnection

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