  In this work simulations are presented of low viscosity ethanol and high
viscosity silicone oil droplets impacting on a dry solid surface at atmospheric
and reduced ambient pressure. The simulations are able to capture both the
effect of the ambient gas pressure and liquid viscosity on droplet impact and
breakup. The results suggests that the early time droplet impact and gas film
behavior for both low and high viscosity liquids share the same physics.
However, for later time liquid sheet formation and breakup high and low
viscosity liquids behave differently. These results explain why for both kinds
of liquids the pressure effect can be observed, while at the same time
different high and low viscosity splashing regimes have been identified
experimentally.
