Unresolved CFD and DEM Coupled Simulations on Scour around a Subsea Pipeline

In this paper, numerical studies were carried out on scour around a subsea pipeline. A coupled solver between computational fluid dynamics (CFD) and discrete element method (DEM) was selected to simulate flow particle interactions. To select validate the model parameters in solver, angles of repose incipient motion simulated. From validation studies, coefficient rolling friction with spherical particles could predict behavior non-spherical particles. The pipeline simulated, individual soil tracked. Particle motions generated by drag force, due high velocity. Three development process, such as onset scour, tunnel erosion, lee-wake studied discussed. depth evolution showed good agreement experimental data. It confirmed that parameters, predicted process well.