Helical shell models for MHD turbulence

T. Lessinnes - D. Carati

Statistical and Plasma Physics, Université Libre de Bruxelles, CampusPlaine, CP 231, B-1050 Brussels, Belgium

Abstract
Based on the helical decomposition of both the magnetic and the velocity fields, a helical shell model for MHD turbulence is introduced. It is used to study the influence of the forcing helicity on the onset of dynamo. It is shown that the well-known GOY shell model is not well adapted for such a study and that additional interactions between the shell variables have to be taken into account. Tables 3, Figs 2, Refs 25.