1304.3870 (Kiwan Park)

Influence of initial conditions on large scale dynamo growth rate    [PDF]

Kiwan Park

To investigate the effect of energy and helicity on the growth of large scale magnetic field, helical kinetic forcing was applied to the magnetohydrodynamic(MHD) system that had a specific distribution of energy and helicity as an initial condition. Simulation results show the saturation of a system is not influenced by the initial conditions, but the growth rate of large scale magnetic field is proportionally dependent on the initial large scale magnetic energy and helicity. Comparison of the profiles of evolving magnetic and kinetic energy implies that the large scale kinetic energy plays a preceding role in the MHD dynamo in the early time regime. Kinetic energy was observed to migrate backward when the external energy flew into the three dimensional MHD system. The data were analyzed and interpreted using the equations from quasi normal approximation and two scale mean field method.

View original: http://arxiv.org/abs/1304.3870