par Plunian, Franck;Lessinnes, Thomas ;Carati, Daniele ;Stepanov, Rodion
Référence Journal of physics. Conference series, 318, SECTION 4, 042013
Publication Publié, 2011
Référence Journal of physics. Conference series, 318, SECTION 4, 042013
Publication Publié, 2011
Article révisé par les pairs
Résumé : | Using a helical shell model of turbulence, Chen et al. (2003) showed that both helicity and energy dissipate at the Kolmogorov scale, independently from any helicity input. This is in contradiction with a previous paper by Ditlevsen & Giuliani (2001) in which, using a GOY shell model of turbulence, they found that helicity dissipates at a scale larger than the Kolmogorov scale, and does depend on the helicity input. In a recent paper by Lessinnes et al. (2011), we showed that this discrepancy is due to the fact that in the GOY shell model only one helical mode (+ or -) is present at each scale instead of both modes in the helical shell model. Then, using the GOY model, the near cancellation of the helicity flux between the + and - modes cannot occur at small scales, as it should be in true turbulence. We review the main results with a focus on the numerical procedure needed to obtain accurate statistics. |