Interface-resolved simulation of particles in sediment transport

Sediment transport is a common phenomenon happening in nature and it constantly affects the landscape and human lives. The movement and collision of sediment particles modify the flow field around them. Among the flow configurations and particle properties, the shape of particles plays an important role in the fluid-particle interaction process. In this talk, we present numerical simulations of sedimentation transport for spherical particles, oblate particles and their mixture. We use the immersed boundary method to resolve the interactions between the flow and particles. Collisions between particles are modelled by a linear spring-dashpot system. The Adaptive Collision Time Model is employed to calculate the contact force. These numerical tools enable us to study realistic flows where point particle model is not applicable, providing further insights into the sediment transport process.