| Abstrakt: |
The energy spectrum in fully developed turbulence shows the power-law relation, E(k)∝k-(5/3+μ). The deviation from -5/3 is due to the effect of intermittency. Analyzing data in high-Reynolds number turbulence [Rλ≃O(104)], it was found that there are two different power-law regions in E(k). One locates close to the spectral bump and the other is in the lower wave number range. Intermittency corrections are μ=0.075 and μ=0.025, respectively. This result is compared with recent direct numerical simulations (Rλ≃1200) [Phys. Fluids 15, L21 (2003)] in which μ is not negligible, but is evaluated to be 0.1. We also comment on the Kolmogorov constant and the scaling exponent of velocity structure function. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
