We demonstrate an inverse energy cascade in a minimal model of forced 2D quantum vortex turbulence. We simulate the Gross-Pitaevskii equation for a moving superfluid subject to forcing by a stationary grid of obstacle potentials, and damping by a stationary thermal cloud. The forcing injects large amounts of vortex energy into the system at the scale of a few healing lengths. A regime of forcing and damping is identified where vortex energy is efficiently transported to large length scales via an inverse energy cascade associated with the growth of clusters of same-circulation vortices, a Kolmogorov scaling law in the kinetic energy spectrum over a substantial inertial range, and spectral condensation of kinetic energy at the scale of the system size. Our results provide clear evidence that the inverse energy cascade phenomenon, previously observed in a diverse range of classical systems, can also occur in quantum fluids.
Inverse energy cascade in forced two-dimensional quantum turbulence.
M. Reeves,T. Billam,B. Anderson,Ashton S. Bradley
Published 2012 in Physical Review Letters
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- Publication year
2012
- Venue
Physical Review Letters
- Publication date
2012-09-26
- Fields of study
Medicine, Physics
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Semantic Scholar, PubMed
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