Numerical Analysis of Behavior of High-viscosity Electromagnetic Fluid Using a Coupled Method of Particle Method and FEM

摘要

Electromagnetic fluid, which is usually a suspension of extremely fine particles of electric or magnetic characteristics in a carrier fluid, shows unique behaviors such as a large deformation in electromagnetic field. This paper deals elongation and sharpening of electromagnetic fluid with extremely high viscosity in electrostatic field. This behavior of fluid is very difficult to calculate with FEM because it includes an intensive deformation and a large change of interfacial surface. Therefore we propose an improved three dimensional combined analysis method of FEM and MPS (Moving Particle Semi-implicit). Electrostatic field and fluid deformation are calculated with FEM and MPS respectively and they are weakly coupled. Specifically electrostatic field and electrostatic force acting on fluid is calculated with FEM in each step and the force is distributed to particles in MPS in the form of electric stress as an external force. This research calculates fluid speed due to viscous term in Navier-Stokes equations implicitly and succeeds in calculating a deformation of high-viscosity electromagnetic fluid which is similar to measured results.