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Vortex-Density Fluctuations, Energy Spectra, and Vortical Regions in Superfluid Turbulence

Lookup NU author(s): Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi

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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.

Publication metadata

Author(s): Baggaley AW, Laurie J, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review Letters

Year: 2012

Volume: 109

Issue: 20

Print publication date: 01/11/2012

ISSN (print): 0031-9007

ISSN (electronic): 1079-7114

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevLett.109.205304

DOI: 10.1103/PhysRevLett.109.205304

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