Far-dissipation range of turbulence
- 17 May 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (20) , 3051-3054
- https://doi.org/10.1103/physrevlett.70.3051
Abstract
Navier-Stokes turbulence at low Reynolds number (≊15) is studied by high-resolution computer simulation. The energy spectrum in the range 5<k<10 is well fitted by exp(-ck/), where is the Kolmogorov dissipation wave number, α≊3.3 and c≊7.1. High-order spatial derivatives of the velocity field exhibit strong intermittency, associated with gentle spatial variation of large-scale structure rather than with sparse, intense small-scale structures. Analysis by the direct-interaction approximation, which ignores intermittency, gives α=3, c≊11.
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