We present the first direct-numerical-simulation study of the statistical properties of two-dimensional superfluid turbulence in the simplified, 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. © 2015 American Physical Society.

Anupam Gupta

Department of Physics

V. Shukla

R. Pandit

Fulltext

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Journal	Physical Review B - Condensed Matter and Materials Physics
Publisher	American Physical Society
ISSN	10980121