Three-fluid simulation: Study of a Jet after impact of a drop on a pool of immiscible liquid

Multiphase problems usually consist of more than two fluids, for example fluid/gas mixtures in combustion engines as well as in industry in general. We also observe more than three fluids during phase changes. Furthermore, the ejection of small droplets or aerosols following an impact is also a crucial issue, in particular for the safety of personnel in the presence of hazardous fluids due to their toxicity (chemistry) or their properties (heat in the steel industry). We propose here to couple these two questions by simulating a jet due to a drop impact. The problem studied consists of a droplet surrounded by a gas, impacting an oil film above a deep pool of liquid. To perform these simulations, we use Basilisk. We consider here at least three different fluids, the gas, an oil and the same fluid in the drop and in the pool. Going from two to three fluids in the problem increases the number of physical parameters. To begin, we first decided to focus the study on the influence of the viscosity of the substrate on the maximum speed of the jet following the impact.