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Three-dimensional inverse energy transfer induced by vortex reconnections
Andrew W Baggaley1, Carlo F Barenghi2, Yuri A Sergeev3
1School of Mathematics and Statistics, University of Glasgow, Glasgow, G12 8QW, United Kingdom.
Summary
Superfluid turbulence in helium exhibits inverse energy transfer, where energy moves from smaller to larger scales. This phenomenon, driven by anisotropic vortex reconnections, offers insights into turbulence across different fluid systems.
Area of Science:
- Quantum fluid dynamics
- Low-temperature physics
- Turbulence research
Background:
- Superfluid helium has zero viscosity and quantized vorticity in discrete filaments.
- Understanding turbulence in superfluids is crucial for fundamental physics and potential applications.
Purpose of the Study:
- To investigate three-dimensional inverse energy transfer in superfluid turbulence.
- To explore the role of vortex dynamics in this energy transfer process.
Main Methods:
- Numerical simulations of superfluid turbulence.
- Generation of turbulence using flows of vortex rings.
- Analysis of energy transfer across different length scales.
Main Results:
- Evidence of three-dimensional inverse energy transfer from small to large length scales.
- Identification of anisotropic flow favoring same-polarity vortex reconnections as the mechanism.
- Connection to potential indirect laboratory observations.
Conclusions:
- Superfluid turbulence exhibits inverse energy transfer, challenging conventional turbulence models.
- The anisotropic nature of vortex reconnections is key to this phenomenon.
- This finding prompts comparisons with turbulence in classical fluids.
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