Sediment Transport Mechanics
In the present study, a well-resolved large-eddy simulation was coupled to a morphodynamical model in order to study the sediment dynamics and the creation/evolution of ripples over a sandy bed. The simulations were based on the solution of the Navier-Stokes equations for the flow and the advection-diffusion equation for the suspended sediment. The evolution of the bed form was obtained by solving the conservation of sediment mass equation. The Immersed Boundary method was implemented for the imposition of fluid and sediment boundary conditions on the moving bed surface. Results are presented for ripple creation/propagation, and ripples adapting to water conditions.