Particle motion in microfluidics simulated using a Femlab implementation   of the level set method
  We implement the level set method for numerical simulation of the motion of a suspended particle convected by the fluid flow in a microchannel. The method automatically cope with the interactions between the particle and the channel walls. We apply the method in a study of particles moving in a channel with obstacles of different shapes. The generality of the method also makes it applicable for simulations of motion of particles under influence of external forces. 
Martin Heller and Henrik Bruus