ON RECENT INTERMITTENCY MODELS OF TURBULENCE

Two recent intermittency models by Chen and Cao [Phys. Rev. E 52, R575 7 (1995)] and Nelkin [Phys. Rev. E 52, R4610 (1995)] stemming from Nov ikov's criticism [Phys. Rev. E 50, R3303 (1994)] on the She-Leveque mo del [Phys. Rev. Lett. 72, 336 (1994)] are discussed. Both models ate r ewritten using mu(6) (deviation from Kolmogorov 1941 of the sixth orde r structure function exponent) values computed numerically (=0.23 and 0.43 using longitudinal and lateral velocity differences). Scaling exp onents are compared. (C) 1997 American Institute of Physics.