Abstract
Fully-developed turbulence consists of hierarchies of eddies of various sizes, where a small-scale eddy is generated from a larger eddy and disintegrates into smaller eddies of about the half-length size in a finite time. Using FRISCH-SULEM-NELKIN’s β-model of in-termittency in a slightly-extended form, we discuss how many eddies are generated from one eddy by the energy cascade. Let N be the mean number of offspring for one cascade step. For the β-model, the 1941 KOLMOGOROV theory leads to N=23, whereas a recent theory of FUJISAKA and MORI leads to N≃6.32. This number is related to the intermit-tency exponent µ by µ=3-log2N ≃0.341. This is in agreement with the experiments µexp =0.3~0.4.
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Mori, H., Fujisaka, H. (1979). A Simplified Theory of Intermittent Fully-Developed Turbulence. In: Haken, H. (eds) Pattern Formation by Dynamic Systems and Pattern Recognition. Springer Series in Synergetics, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67480-8_8
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DOI: https://doi.org/10.1007/978-3-642-67480-8_8
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