Grid convergence assessment for adaptive grid simulations of normal drop impacts onto liquid films in axi-symmetric and three-dimensional geometries

Normal liquid drop impact on a liquid film is studied numerically using a modified OpenFOAM solver in three-spatial dimensions, in which dynamic grid refinement is modified to accurately describe the initial conditions before impact. Numerical simulations are found to accurately predict the evolution of the splashing lamella. A new procedure for assessing grid convergence is introduced, which is based on the definition of a hierarchical set of bounding boxes in which the total liquid volume is computed to assess global as well as local grid convergence.