Velocity spectra of quantum turbulence: experiments, numerics and models

TL;DR

This paper reviews experimental, numerical, and theoretical studies on superfluid turbulence, highlighting the similarities to classical turbulence at large scales and exploring the current understanding and limitations at smaller scales.

Contribution

It provides a comprehensive overview of velocity spectra in quantum turbulence through experiments, simulations, and models, clarifying the conditions under which superfluid turbulence resembles classical turbulence.

Findings

Velocity spectra at large scales are similar to classical turbulence.

Current models explain large-scale behavior but have limitations at smaller scales.

Experimental and numerical results support the double-fluid nature of superfluid turbulence.

Abstract

Superfluid Turbulence is unusual and presents a challenge to fluid dynamicists because it consists of two coupled, inter penetrating turbulent fluids: the first is inviscid with quantised vorticity, the second is viscous with continuous vorticity. Despite this double nature, the observed spectra of the superfluid turbulent velocity at sufficiently large length scales are similar to those o ordinary turbulence. We present experimental, numerical and theoretical results which explain these similarities, and illustrate the limits of our present understanding of superfluid turbulence at smaller scales.