Numerical Simulation of 0scillation of Single Spike of Magnetic Fluid under Vertical Alternating Magnetic Field

Abstract

A numerical simulation was made of the oscillation of a spike of a magnetic fluid droplet under a vertical alternating magnetic field, and the time-dependent changes of the droplet shape and the inner flow field were estimated. The resonance was found to occur when the timings of the changes of the magnetic field and the radial flow motion coincide. A peculiar oscillation occurs when an annular peak is formed exactly at the maximum of the magnetic held. The oscillation of mode 2 occurs in when the magnetic field becomes its maximum exactly before the formation of the annular peak. The oscillation of mode 1 occurs when the single peak is formed exactly at the maximum of the magnetic field.