Vortex-density fluctuations, energy spectra, and vortical regions in superfluid turbulence

Andrew W. Baggaley, Jason Laurie, Carlo F. Barenghi

Research output: Contribution to journalArticle

Abstract

Measurements of the energy spectrum and of the vortex-density fluctuation spectrum in superfluid turbulence seem to contradict each other. Using a numerical model, we show that at each instance of time the total vortex line density can be decomposed into two parts: one formed by metastable bundles of coherent vortices, and one in which the vortices are randomly oriented. We show that the former is responsible for the observed Kolmogorov energy spectrum, and the latter for the spectrum of the vortex line density fluctuations.
Original languageEnglish
Article number205304
Number of pages5
JournalPhysical Review Letters
Volume109
Issue number20
DOIs
Publication statusPublished - 14 Nov 2012

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energy spectra
turbulence
vortices
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abstract = "Measurements of the energy spectrum and of the vortex-density fluctuation spectrum in superfluid turbulence seem to contradict each other. Using a numerical model, we show that at each instance of time the total vortex line density can be decomposed into two parts: one formed by metastable bundles of coherent vortices, and one in which the vortices are randomly oriented. We show that the former is responsible for the observed Kolmogorov energy spectrum, and the latter for the spectrum of the vortex line density fluctuations.",
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Vortex-density fluctuations, energy spectra, and vortical regions in superfluid turbulence. / Baggaley, Andrew W.; Laurie, Jason; Barenghi, Carlo F.

In: Physical Review Letters, Vol. 109, No. 20, 205304, 14.11.2012.

Research output: Contribution to journalArticle

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AB - Measurements of the energy spectrum and of the vortex-density fluctuation spectrum in superfluid turbulence seem to contradict each other. Using a numerical model, we show that at each instance of time the total vortex line density can be decomposed into two parts: one formed by metastable bundles of coherent vortices, and one in which the vortices are randomly oriented. We show that the former is responsible for the observed Kolmogorov energy spectrum, and the latter for the spectrum of the vortex line density fluctuations.

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