Automatic Tracking of Corona Propagation in Three-Dimensional Simulations of Non-Normal Drop Impact on a Liquid Film

A novel procedure for tracking the propagation of the corona observed after the impact of liquid drops on thin films is proposed for the case of non-normal drop impacts. Three-dimensional adaptive-grid simulations are performed for different impingement angles and Weber numbers. In the numerical model, the Navier-Stokes equations are complemented with the Volume-Of-Fluid (VOF) method to model the gas-liquid interface. In the considered cases, the main features of the corona dynamics determined using the proposed technique are consistent with the three-dimensional description of the flow.