Vorticity Locking and Pressure Dynamics in Finite-Temperature Superfluid Turbulence

Jason Laurie; Andrew W. Baggaley

doi:10.1103/PhysRevFluids.8.054604

Vorticity Locking and Pressure Dynamics in Finite-Temperature Superfluid Turbulence

Jason Laurie, Andrew W. Baggaley

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	054604
Number of pages	19
Journal	Physical Review Fluids
Volume	8
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevFluids.8.054604
Publication status	Published - 9 May 2023

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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.

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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.
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title = "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.",

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N2 - 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.

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Vorticity Locking and Pressure Dynamics in Finite-Temperature Superfluid Turbulence

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