期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.155302
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资金
- New Zealand Marsden Fund
- Royal Society of New Zealand
- University of Otago
- UK EPSRC [EP/K030558/1]
- US National Science Foundation [PHY-1205713]
- Engineering and Physical Sciences Research Council [EP/K030558/1] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205713] Funding Source: National Science Foundation
- EPSRC [EP/K030558/1] Funding Source: UKRI
The Reynolds number provides a characterization of the transition to turbulent flow, with wide application in classical fluid dynamics. Identifying such a parameter in superfluid systems is challenging due to their fundamentally inviscid nature. Performing a systematic study of superfluid cylinder wakes in two dimensions, we observe dynamical similarity of the frequency of vortex shedding by a cylindrical obstacle. The universality of the turbulent wake dynamics is revealed by expressing shedding frequencies in terms of an appropriately defined superfluid Reynolds number, Res, that accounts for the breakdown of superfluid flow through quantum vortex shedding. For large obstacles, the dimensionless shedding frequency exhibits a universal form that is well-fitted by a classical empirical relation. In this regime the transition to turbulence occurs at Re-s approximate to 0.7, irrespective of obstacle width.
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