Numerical simulation on dynamics of a droplet upon a Liquid film

The collision dynamics between a droplet and a liquid film of variable thickness has been studied in the numerical simulations. The full Navier-Stokes equations are solved in axisymmetric formulation coupled by the volume-of fluid (VOF) method and utilizing an adapting local refinement technique for providing the fine grid to tracking the interface between the gas and the droplet and liquid film. The surface tension force is modeled by a continuum surface force model. To validate our method, results of numerical simulations are compared with experiments available. Results indicate that the motion behavior of droplet impingement upon the liquid film is dominantly influenced by the initial kinetic energy as well as the surface tension and the liquid viscosity.