Lagrangian Coherent Structures in Nonlinear Dynamos

摘要: Turbulence and chaos play a fundamental role in stellar convective zones through the transport of particles, energy, momentum, fast dynamos, stretching, twisting, folding magnetic flux tubes. A particularly revealing way to describe turbulent motions is analysis Lagrangian coherent structures (LCSs), which are material lines or surfaces that act as barriers fluid. We report detection LCSs helical MHD dynamo simulations with scale separation. In an Arnold-Beltrami-Childress flow, two regimes, propagating mean-field regime intermittent regime, identified diffusivity varied. The sharp contrast between chaotic tangle attracting repelling both regimes permits unique impact field on velocity field. second example, reveal link level mixing saturation large-scale when exceeds equipartition value.