DIRECT NUMERICAL SIMULATIONS OF SEDIMENTATION AND LIFT-OFF OF RIGID PARTICLES IN VISCOUS FLOWS

摘要

An efficient multigrid fictitious boundary method (MFBM) for the detailed simulation of the sedimentations and lift-off of rigid particles in viscous flows is presented in this paper. The calculation is carried on a fixed multigrid finite element mesh on which fluid equations are satisfied everywhere, and the rigid particles are allowed to move freely through the mesh. The motion of the rigid particle is modeled by the Newton-Euler equations. Numerical experiments are presented to show that the presented MFBM provides a robust and efficient approach to directly simulate the sedimentations and lift-off of rigid particles in viscous flows.