School of Mathematics and Statistics, University of Glasgow, Glasgow G12 8QW, United Kingdom.
Phys Rev Lett. 2012 Nov 16;109(20):205304. doi: 10.1103/PhysRevLett.109.205304. Epub 2012 Nov 14.
Measurements of the energy spectrum and of the vortex-density fluctuation spectrum in superfluid turbulence seem to contradict each other. Using a numerical model, we show that at each instance of time the total vortex line density can be decomposed into two parts: one formed by metastable bundles of coherent vortices, and one in which the vortices are randomly oriented. We show that the former is responsible for the observed Kolmogorov energy spectrum, and the latter for the spectrum of the vortex line density fluctuations.
在超流体湍流中，能量谱和涡旋密度涨落谱的测量结果似乎相互矛盾。我们使用数值模型表明，在任意一个时刻，总涡线密度都可以分解为两部分：一部分由相干涡旋的亚稳束形成，另一部分由随机取向的涡旋组成。我们证明，前者是观察到的 Kolmogorov 能量谱的原因，后者是涡线密度涨落谱的原因。
