The simulation of droplets, bubbles and interfaces Stephane Zaleski Université de Paris VI (Pierre et Marie Curie) Droplets, bubbles and interfaces offer fascinating physical and mathematical problems and are a key part of the microscopic modeling of multiphase flow in porous media and other contexts. The talk will describe how to address these problems numerically, using tools such as the Volume of Fluid method. In particular, I will discuss the problems of contact line motion, the invasion of porous media and turbulent free-surface flows. The issues arising from the upscaling of simulations to more extreme HPC environments will also be discussed.