Strong anisotropy of superfluid He counterflow turbulence
arXiv:1908.01144 · doi:10.1103/PhysRevB.100.134515
Abstract
We report on a combined theoretical and numerical study of counterflow turbulence in superfluid He in a wide range of parameters. The energy spectra of the velocity fluctuations of both the normal-fluid and superfluid components are strongly anisotropic. The angular dependence of the correlation between velocity fluctuations of the two components plays the key role. A selective energy dissipation intensifies as scales decrease, with the streamwise velocity fluctuations becoming dominant. Most of the flow energy is concentrated in a wavevector plane which is orthogonal to the direction of the counterflow. The phenomenon becomes more prominent at higher temperatures as the coupling between the components depends on the temperature and the direction with respect to the counterflow velocity.
arXiv comment16 pages, 11 figures
References in corpus (25)
- Cascades and transitions in turbulent flows
- Anisotropy in Turbulent Flows and in Turbulent Transport
- Correlation functions in isotropic and anisotropic turbulence: the role of the symmetry group
- Coherent structures and extreme events in rotating multiphase turbulent flows
- Visualization of the normal-fluid turbulence in counterflowing superfluid 4He
- Energy Spectra of Developed Turbulencein Helium Superfluids
- Exact two-dimensionalization of rapidly rotating large-Reynolds-number flows
- Structure of quantum vortex tangle in He-4 counterflow turbulence
- Scale-dependent cyclone-anticyclone asymmetry in a forced rotating turbulence experiment
- Energy and Vorticity Spectra in Turbulent Superfluid He from to
- Mesoscale Equipartition of kinetic energy in Quantum Turbulence
- Intermittency of quantum turbulence with superfluid fractions from 0% to 96%
- The Universal Scaling Exponents of Anisotropy in Turbulence and their Measurement
- Scaling Exponents in Anisotropic Hydrodynamic Turbulence
- Coexistence and interplay of quantum and classical turbulence in superfluid He-4: Decay, velocity decoupling and counterflow energy spectra
- Turbulent statistics and intermittency enhancement in coflowing superfluid He
- Inverse velocity statistics in two dimensional turbulence
- He Counterflow Differs Strongly from Classical Flows: Anisotropy on Small Scales
- Statistics of turbulence and intermittency enhancement in superfluid He counterflow
- Energy Spectra of Superfluid Turbulence in He
- Counter-flow Induced Decoupling in Super-Fluid Turbulence
- Phenomenology of two-dimensional stably stratified turbulence under large-scale forcing
- Local and non-local energy spectra of superfluid He turbulence
- Theory of energy spectra in superfluid He-4 counterflow turbulence
- Statistics of Quantum Turbulence in Superfluid He