Homogeneous Isotropic Superfluid Turbulence in Two Dimensions: Inverse   and Forward Cascades in the Hall-Vinen-Bekharevich-Khalatnikov model
  We present the first direct-numerical-simulation study of the statistical properties of two-dimensional superfluid turbulence in the Hall-Vinen-Bekharevich-Khalatnikov two-fluid model. We show that both normal-fluid and superfluid energy spectra can exhibit two power-law regimes, the first associated with an inverse cascade of energy and the second with the forward cascade of enstrophy. We quantify the mutual-friction-induced alignment of normal and superfluid velocities by obtaining probability distribution functions of the angle between them and the ratio of their moduli. Our study leads to specific suggestions for experiments. 
Vishwanath Shukla, Anupam Gupta, Rahul Pandit
physics.flu-dyn cond-mat.quant-gas cond-mat.stat-mech nlin.CD