Vorticity Locking and Pressure Dynamics in Finite-Temperature Superfluid Turbulence

Abstract

We present a numerical study of finite-temperature superfluid turbulence using the vortex filament model for superfluid helium. We examine the phenomenon of vorticity locking between the normal and superfluid components across a wide range of temperatures, using two different structures of external normal fluid drive. Our analysis is restricted to one-way coupling between the two components, and subject to this simplification, we show that vorticity locking increases with temperature leading to the superfluid flow being more influenced by the characteristics of the normal fluid. This results in stronger superfluid polarization and deviations from Gaussian statistics with a more probable occurrence of extreme fluctuations. We also examine how these properties influence the pressure field and attempt to verify a longstanding Pk∝k−7/3 theoretical quantum signature within the spatial pressure spectrum.

Publication DOI: https://doi.org/10.1103/PhysRevFluids.8.054604
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Systems analytics research institute (SARI)
College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Applied Mathematics & Data Science
College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies
Additional Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Publication ISSN: 2469-990X
Last Modified: 20 Jun 2024 07:26
Date Deposited: 16 May 2023 09:58
Full Text Link:
Related URLs: https://journal ... Fluids.8.054604 (Publisher URL)
PURE Output Type: Article
Published Date: 2023-05-09
Accepted Date: 2023-04-12
Authors: Laurie, Jason (ORCID Profile 0000-0002-3621-6052)
Baggaley, Andrew W.

Download

[img]

Version: Published Version

License: Creative Commons Attribution

| Preview

[img]

Version: Accepted Version

Access Restriction: Restricted to Registered users only

License: Creative Commons Attribution


Export / Share Citation


Statistics

Additional statistics for this record