This dataset contains the input files, geometry files, solver configuration, and selected output time-series necessary to reproduce the benchmark case shown in the associated paper, accepted for publication in the Coastal and Offshore Science and Engineering (COSE) journal: the buoyant rise and collision of three rigid spheres in a two-phase (air–water) tank simulated with a coupled CFD–DEM framework implemented in REEF3D. The dataset includes REEF3D configuration files, DEM collision parameters, raw solver outputs (binary/VTK), and plots presented in the paper. The numerical framework combines a high-order finite-difference CFD solver with a Direct Forcing Immersed Boundary Method (DF-IBM) and a multi-level collision detection and viscoelastic contact model.

REEF3D, MultiBody_LinearCollision