论文标题
有限温度湍流超流体氦气的速度循环间歇性
Velocity circulation intermittency in finite-temperature turbulent superfluid helium
论文作者
论文摘要
我们通过使用Hall-Vinen-Bekarevich-Halatnikov模型的实验网格湍流和数值模拟来研究湍流超流体氦气中循环矩的间歇性。更确切地说，我们计算惯性范围内的大小$ r $的速度循环$γ_r$。对于实验数据和数值数据，循环方差显示了惯性范围内的清晰的kolmogorov缩放$ \langleγ_r^2 \ rangle \ sim r^{8/3} $，独立于温度。在误差线内，高阶矩的缩放指数与先前报道的经典湍流和低温量子湍流数值模拟中的异常循环指数相当。
We study intermittency of circulation moments in turbulent superfluid helium by using experimental grid turbulence and numerical simulations of the Hall-Vinen-Bekarevich-Khalatnikov model. More precisely, we compute the velocity circulation $Γ_r$ in loops of size $r$ laying in the inertial range. For both, experimental and numerical data, the circulation variance shows a clear Kolmogorov scaling $\langle Γ_r^2 \rangle \sim r^{8/3}$ in the inertial range, independently of the temperature. Scaling exponents of high-order moments are comparable, within error bars, to previously reported anomalous circulation exponents in classical turbulence and low-temperature quantum turbulence numerical simulations.
