Entrainment of Sediment Particles in Protection Layers

Protection layers are often used to prevent scour and erosion, e.g., prevention of around wind turbine foundations. However, several cases exist where installed protection has settled, loss sediment through the armor layer can explain failure. This paper presents use a detailed large eddy simulation–discrete-element method (LES-DEM) model study particles in porous media. First, simple idealized case removal from an cavity beneath smooth turbulent boundary was set up. The showed penetration turbulence, mainly form sweep events, into cavity. high momentum would at times reach bottom entrain fine sediments. subsequently roll over pile be suspended return flow penetrating turbulence. Finally, more realistic up with series closely packed spheres. Fine sediments were seeded bed. A hydraulically rough developed layer, statistics compared well against experiments. Turbulent structures characteristic bursting process identified wall case. events’ entrainment suspending finer is detailed. flushing cavities passing ejection events also presented.