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Second and third order longitudinal structure functions and wavenumberspectra of isotropic turbulence are computed using the EDQNM model and comparedto results of the multifractal formalism. At the highest Reynolds numberavailable in windtunnel experiments, $R_\lambda=2500$, both the multifractalmodel and EDQNM give power-law corrections to the inertial range scaling of thevelocity increment skewness. For EDQNM, this correction is a finite Reynoldsnumber effect, whereas for the multifractal formalism it is an intermittencycorrection that persists at any high Reynolds number. Furthermore, the twoapproaches yield realistic behavior of second and third order statistics of thevelocity fluctuations in the dissipative and near-dissipative ranges.Similarities and differences are highlighted, in particular the Reynolds numberdependence.

Reynolds number effect on the velocity increment skewness in isotropic turbulence