Fictitious domain method combined with the DEM for studying particle-particle/particle-wall collision in fluid

The interaction between particles and a fluid is very important in many fields. The hydrodynamic characteristics of both spheroidal particles and non-spherical particles sediment in the fluid and their rebound dynamics were investigated by using the fictitious domain method-discrete element method (FDM-DEM) in this paper. The novelty lies in the combination of the Monte Carlo scheme with FDM to improve the accuracy of hydrodynamic force. A soft-sphere scheme of DEM is used to model the collision of particles. The hydrodynamic force on the particle is fully resolved by the FDM. The numerical results of spherical particle are verified by comparing the previous numerical and experimental results implemented by Cate. The results of non-spherical particles sediment show that the path instability occurs. Those results are in good agreement with the corresponding published data. The method presented in this paper can be used in practical applications.