Influence of gas properties in drop splashing

We study numerically the influence of the surrounding gas in the drop impact dynamics. We observe that when super-hydrophobic boundary conditions are taken, splashing is always present, that we explain through a lubrication argument. On the other hand, when partial wetting is allowed, a splashing/spreading transition is observed. This transition is strongly influenced by the viscosity ratio but shows also a slight dependence with the gas pressure in qualitative agreement with experimental results.