DB3D: Direct numerical simulation of a 3D dam break over an obstacle. The simulation is carried out on an unstructured mesh by adopting a novel level-set free-surface solver. (Ref: E.Schillaci et al.(2016), A level-set aided single-phase model for the numerical simulation of free-surface flow on unstructured meshes, Computers & Fluids, Volume 140 (2016), 97-110)