Journal
PHYSICS OF FLUIDS
Volume 26, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4866456
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Funding
- Portuguese Foundation for Science and Technology [BPD/47815/2008]
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Direct numerical simulations of a planar jet and of shear free turbulence at Re-lambda = 115-140 using very fine resolutions allow the first direct identification and characterisation of the viscous superlayer (VSL) that exists at the edges of mixing layers, wakes, jets, and boundary layers, adjacent to the turbulent/non-turbulent interface. For both flows the VSL is continuous with higher local thicknesses forming near the larger intense vorticity structures. The mean thickness of the VSL is of the order of the Kolmogorov micro-scale and agrees well with an estimate based on the Burgers vortex model. (C) 2014 AIP Publishing LLC.
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