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. We show that vorticity locking increases with temperature leading to the superfluid flow being more influenced by the characteristics of the normal fluid. This also results in stronger superfluid polarization and turbulent intermittency. We also examine how these properties influence the pressure field and attempt to verify a long-standing $P_k\propto k^{-7/3}$ theoretical quantum signature within the spatial pressure spectrum.

arXiv comment15 pages, 14 figures. Accepted version of preprint

References in corpus (18)

• A public turbulence database cluster and applications to study Lagrangian evolution of velocity increments in turbulence
• Theory of Dark Matter Superfluidity
• Velocity Statistics Distinguish Quantum Turbulence from Classical Turbulence
• Steady State of Counterflow Quantum Turbulence: Vortex filament Simulation with the Full Biot-Savart Law
• Holographic turbulence
• Superfluid neutron star turbulence
• Classical and quantum regimes of the superfluid turbulence
• Energy cascade and the four-fifths law in superfluid turbulence
• Structure of quantum vortex tangle in He-4 counterflow turbulence
• The sensitivity of the vortex filament method to different reconnection models
• Vortex spectrum in superfluid turbulence: interpretation of a recent experiment
• Dynamics of quantum turbulence of different spectra
• Tree method for quantum vortex dynamics
• Three-Dimensional Coupled Dynamics of Two-Fluid Model in Superfluid ${}^4$He: Deformed Velocity Profile of Normal Fluid in Thermal Counterflow
• Intermittency of quantum turbulence with superfluid fractions from 0% to 96%
• Local and nonlocal dynamics in superfluid turbulence
• Detection of vortex coherent structures in superfluid turbulence
• Coarse-grained pressure dynamics in superfluid turbulence