  Dynamics of a deformable capsule in an oscillatory flow of a Newtonian fluid
in a microchannel has been studied numerically. The effects of oscillation
frequency, capsule deformability, and channel flow rate have been explored by
simulating the capsule within a microchannel. In addition, the simulation
captures the effect of the type of imposed pressure oscillations on the
migration pattern of the capsule. An oscillatory channel flow enables the
focusing of extremely small biological particles by eliminating the need to
design impractically long channels. The presented results show that the
equilibrium position of the capsule changes not only by the addition of an
oscillatory component to the pressure gradient, but it also is influenced by
the capsule deformability and channel flow rate. Furthermore, it has been shown
that the amplitude of oscillation of capsules decreases as the channel flow
rate and the rigidity of the capsule increases.
