Classical-like wakes past elliptical obstacles in atomic Bose-Einstein condensates
arXiv:1411.4842 · doi:10.1088/1742-6596/594/1/012044
Abstract
We reinvestigate numerically the classic problem of two-dimensional superfluid flow past an obstacle. Taking the obstacle to be elongated (perpendicular to the flow), rather than the usual circular form, is shown to promote the nucleation of quantized vortices, enhance their subsequent interactions, and lead to wakes which bear striking similarity to their classical (viscous) counterparts. Then, focussing on the recent experiment of Kwon et al. (arXiv:1403.4658) in a trapped condensate, we show that an elliptical obstacle leads to a cleaner and more efficient means to generate two-dimensional quantum turbulence.
7 pages, 6 figures. Conference proceedings for the International Laser Physics Workshop (Sofia, July 2014)
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- Kelvin-Helmholtz instability in an atomic superfluid
- Flying in a superfluid: starting flow past an airfoil
- Critical velocity of a finite-temperature Bose gas
- Anomalous minimization for critical velocity of superflow along a step potential