  A computational study of capsule ejection from a narrow channel into a
reservoir is undertaken for a combination of varying deformable capsule sizes
and channel dimensions. A mass spring membrane model is coupled to an Immersed
Boundary Lattice Boltzmann model solver. The aim of the present work is the
description of the capsules motion, deformation and the response of the fluid
due to the complex particle dynamics. The interactions between the capsules
affect the local velocity field significantly and are responsible for the
dynamics observed. Capsule membrane deformability is also seen to affect inter
capsule interaction, and we observe that the train of three particles locally
homogenizes the velocity field and the leading capsule travels faster than the
other two trailing capsules. On the contrary, variations in size of the
reservoir do not seem to be relevant, while the ratio of capsule diameter with
respect to channel diameter plays a major role as well as the ratio of capsule
diameter to inter capsule spacing. This flow set up has not been covered in the
literature, and consequently we focus on describing capsule motion, membrane
deformation and fluid dynamics, as a preliminary investigation in this field.
