Numerical study of general shape particles in a concentric annular duct having inner obstacle

We have examined the behavior of solid particles in an annulus. A circular, square and elliptic shaped particle is analysed separately and in pairs. Behaviour of two circular particles moving inside two concentric moving cylinders having an internal obstacle is analysed. The interaction of particle with the fluid and circular obstacle is carried out inside a fixed circular mesh using an Eulerian approach. The coupled fluid and particles system is handled using fictitious boundary method. The hydrodynamic forces acting on the fictitious boundaries (particles) are calculated using an explicit volume integral approach. A collision model proposed by Glowinski et al. is used to prevent particle-wall, particle-particle and particle-obstacle overlapping and collision. The particulate flow is computed using multigrid finite element solver FEATFLOW.