Numerical simulation of the transient stages of 2D magnetic fluid droplet in high-frequency rotating magnetic fields

J.-C. Bacri¹ - A. Cebers² - S. Lacis² - R. Perzynski¹

¹ Universite P. M. Cyrie, 4 place Jussieu, 75252 Paris, Cedex 05, France
² Institute of Physics, Latvian Academy of Sciences, Salaspils-1, LV-2169, latvia

Abstract
It is found by numerical simulation that 2D magnetic fluid droplets in high-frequency rotating form shapes with 2 or 3 spikes. Number of spikes depends on both an initial shape of the droplet and a magnetic field strength. It is found that 3-spike shape of the droplet exists as metastable state and an energy barrier suppresses the transition to 2-spike shape which corresponds to the energy minimum. Results obtained dynamical simulation are in good agreement with the energy minimum calculations carried out previously. In the case of the initial shape with some perturbations, development of spikes and transition to smaller amount of them are observed. At increase of magnetic Bond number the spikes sharpens. Finally some conclusions concerning the comparison of the results of numerical simulation with the experimental observations are pointed out. Figs 2, refs 7.