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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Grid superfluid turbulence and intermittency at very low temperature
1Laboratoire J.L. Lagrange, UMR7293, Université de la Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, B.P. 4229, 06304 Nice Cedex 4, France.
Physical Review. E
|July 15, 2016
Summary
This study simulates low-temperature turbulence using the Gross-Pitaevskii equation. Results reveal universal, intermittent velocity statistics, consistent with classical fluid dynamics.
Area of Science:
- Physics
- Fluid Dynamics
- Quantum Turbulence
Background:
- Investigating turbulence at low temperatures is crucial for understanding quantum fluid behavior.
- Grid-generated turbulence provides a controlled environment for studying turbulent flows.
Purpose of the Study:
- To numerically simulate low-temperature grid-generated turbulence.
- To analyze the statistical properties of velocity increments in turbulent states.
- To compare these statistics with homogeneous and isotropic turbulence models.
Main Methods:
- Numerical simulations using the Gross-Pitaevskii equation.
- Analysis of regularized velocity increments.
- Comparison with Taylor-Green flow data.
Main Results:
- Incompressible velocity increments exhibit skewness in turbulent states.
- The observed statistics demonstrate universality.
- Intermittency and a Kolmogorov constant near classical fluid values were found for the Taylor-Green flow.
Conclusions:
- The study confirms universal statistical properties in low-temperature turbulence.
- Findings suggest similarities between quantum and classical fluid turbulence.
- The Gross-Pitaevskii equation is a valid tool for simulating such phenomena.
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