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Mesoscale helicity distinguishes Vinen from Kolmogorov turbulence in helium-II

Lookup NU author(s): Dr Luca Galantucci, Professor Carlo Barenghi, Dr Nick Parker, Dr Andrew Baggaley

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Abstract

Experiments and numerical simulations show that quantum turbulence exists in two distinct limiting regimes: Kolmogorov turbulence (which shares with classical turbulence the important property of a cascade of kinetic energy from large eddies to small eddies) and Vinen turbulence (which is more similar to a random flow). In this work, we define a mesoscale helicity for the superfluid, which, tested in numerical experiments, distinguishes the two turbulent regimes, quantifying the amount of nonlocal vortex interactions and the orientation of the vortex lines.


Publication metadata

Author(s): Galantucci L, Barenghi CF, Parker NG, Baggaley AW

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2021

Volume: 13

Online publication date: 06/04/2021

Acceptance date: 29/03/2021

Date deposited: 06/04/2021

ISSN (electronic): 2469-9969

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevB.103.144503

DOI: 10.1103/PhysRevB.103.144503


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