Reynolds Number-dependent Flow Dynamics of Twin Non-circular Particles in a Vertical Channel

A numerical study of falling particles in the fluid domain has been presented in Reynolds number perspective. The analysis for the movement of non-circular particles i.e. triangle, square and pentagon has been conducted. The simulations are carried out for four different Reynolds numbers which are 100, 200, 300 and 1000. The numerical results are found for x- and y-components of velocity profile and trajectory paths of twin particles settling in the channel. At each Reynolds number the results have been compared with particle’s shape. Furthermore, the data in tabular form has been presented for minimum x-and y-velocity indicating time for velocity of falling particle in the computational domain, also mentioned the height. The minimum distance between twin particles indicating time at which the minimum distance has been achieved and the height it attains at that time. The simulations are conducted by using fictitious boundary method (FBM) combined with an Eulerian approach, which has been utilized for expressing the free movement of particles in the channel. We applied an explicit volume integral approach for finding the hydrodynamic forces exerted on the surfaces of particle. The numerical simulations are carried out using a multigrid finite element solver FEATFLOW in the fluid flow.