Numerical study of two particle migration in a stepped channel

Abstract

Two particle migration in a stepped channel is analyzed by the aid of finite volume immersed boundary method (based on feedback forcing scheme). The particles seem to travel passing the step at the center and reach the equilibrium position. The density ratio and depth of step are varied to observe the behaviour of migration time and equilibrium position. The buoyant force increases with rise in density ratio and this will bring the particle equilibrium position closer to bottom wall for larger density ratios. It should be also noted that the migration time will increase with the density ratio due to enhancement in buoyant force. When the depth of step rises then the equilibrium position is moved towards bottom wall. On the other part, the migration time increases with depth of step. The critical depth corresponds to the lowest migration time is 0.15 for the present study. © 2023 AIP Publishing LLC.