  The complexity of binary droplet collisions increases for the collision of
immiscible liquids with the occurrence of triple lines and thin encapsulating
films. The Volume of Fluid (VOF) method is extended with an efficient interface
reconstruction applicable to three-component cells of arbitrary configuration.
Together with an enhanced Continuous Surface Stress (CSS) model for accurate
surface force computation, which was gained by the introduction of a film
stabilisation approach, this enables the simulation of the interaction of two
droplets of immiscible liquids. With the new methods, simulations of binary
droplet collisions of fully wetting liquids were performed with excellent
agreement to experimental data in different collision regimes regarding both
the morphology and the prediction of the regime boundaries for head-on as well
as off-centre collisions.
