  To understand the non-equilibrium relaxation dynamics of a liquid droplet on
a switchable substrate the interplay of different length- and time-scales needs
to be understood. We present a method to map the microscopic information,
resulting from a molecular dynamics simulation, to a mesoscopic scale,
reflected by a thin film model. After a discussion of the mapping procedure we
first analyze the relaxation of a liquid droplet upon switching the wettability
of the substrate. Further, we show that a nearly identical mapping procedure
can be used for the description of two coalescing droplets. With our procedure
we take a first step to extend the mapping from the equilibrium case to
non-equilibrium wetting dynamics, thus allowing for a quantitative multi-scale
analysis.
