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To understand the non-equilibrium relaxation dynamics of a liquid droplet ona switchable substrate the interplay of different length- and time-scales needsto 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 wefirst analyze the relaxation of a liquid droplet upon switching the wettabilityof the substrate. Further, we show that a nearly identical mapping procedurecan be used for the description of two coalescing droplets. With our procedurewe take a first step to extend the mapping from the equilibrium case tonon-equilibrium wetting dynamics, thus allowing for a quantitative multi-scaleanalysis.

Multiscale perspective on wetting on switchable substrates: mapping between microscopic and mesoscopic models