Sub-Kolmogorov-Scale Fluctuations in Fluid Turbulence

Details Sub-Kolmogorov-Scale Fluctuations in Fluid Turbulence Sub-Kolmogorov-Scale Fluctuations in Fluid Turbulence

2007-10-22

arxiv.org/abs/0710.4100v1

Europhys. Lett., 80 (2007) 54001

Physics

Fluid Dynamics

8 pages, 5 figures (Figs. 1 and 3 in reduced quality)

Scientific paper

10.1209/0295-5075/80/54001

We relate the intermittent fluctuations of velocity gradients in turbulence to a whole range of local dissipation scales generalizing the picture of a single mean dissipation length. The statistical distribution of these local dissipation scales as a function of Reynolds number is determined in numerical simulations of forced homogeneous isotropic turbulence with a spectral resolution never applied before which exceeds the standard one by at least a factor of eight. The core of the scale distribution agrees well with a theoretical prediction. Increasing Reynolds number causes the generation of ever finer local dissipation scales. This is in line with a less steep decay of the large-wavenumber energy spectra in the dissipation range. The energy spectrum for the highest accessible Taylor microscale Reynolds number R_lambda=107 does not show a bottleneck.

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