A 3D Eulerian-Lagrangian Model for the Motion of the Multiple Non-cohesive Sediment Grains in Water

The numerical simulation of a group of sediment grains is important for the bedload estimation. The present treatise deals with the development of a 3D Eulerian-Lagrangian model by considering the nonlinear drag force, the shear lift force, Magnus force, the buoyancy force, the added mass force, the Basset history force and torque. A sub-model for particle-particle interaction of bed sediment-laden flows is also included. By using the developed model, the effect of particle– particle collision on the trajectories of saltating grains in open-channel flows can be investigated. The analyses of the simulation results indicated that inter-particle collisions introduce several effects on the sediment transport including changing length and height of the sediment saltation and its lateral diffusion. Therefore, the use of such model can increase the accuracy of the bed-load transport estimation.

Keywords:

3D model , Group of particles , Particle– particle collision , Bedload transport