Polanco Juan Ignacio, Krstulovic Giorgio
Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Boulevard de l'Observatoire CS 34229-F 06304 NICE Cedex 4, France.
Phys Rev Lett. 2020 Dec 18;125(25):254504. doi: 10.1103/PhysRevLett.125.254504.
Finite-temperature quantum turbulence is often described in terms of two immiscible fluids that can flow with a nonzero-mean relative velocity. Such out-of-equilibrium state is known as counterflow superfluid turbulence. We report here the emergence of a counterflow-induced inverse energy cascade in three-dimensional superfluid flows by performing extensive numerical simulations of the Hall-Vinen-Bekarevich-Khalatnikov model. As the intensity of the mean counterflow is increased, an abrupt transition, from a fully three-dimensional turbulent flow to a quasi-two-dimensional system exhibiting a split cascade, is observed. The findings of this work could motivate new experimental settings to study quasi-two-dimensional superfluid turbulence in the bulk of three-dimensional experiments. They might also find applications beyond superfluids in systems described by more than one fluid component.
有限温度量子湍流通常用两种互不相溶的流体来描述，这两种流体可以以非零平均相对速度流动。这种非平衡态被称为逆流超流体湍流。我们在此报告，通过对霍尔 - 维宁 - 贝卡列维奇 - 哈拉特尼科夫模型进行广泛的数值模拟，在三维超流体流动中出现了逆流诱导的逆能量级串。随着平均逆流强度的增加，观察到从完全三维湍流到呈现分裂级串的准二维系统的突然转变。这项工作的发现可能会推动新的实验设置，以在三维实验主体中研究准二维超流体湍流。它们也可能在由多个流体组分描述的系统中找到超流体之外的应用。
