Motion of a rigid particle in the lid-driven cavity flow

The motion of an elliptical rigid particle in a lid-driven cavity flow was numerically simulated using the immersed boundary lattice Boltzmann method (IB-LBM). The effects of the particle’s initial orientation angle, initial position, aspect ratio, and size on the motion characteristics were investigated. The computational results indicate that the particle’s motion undergoes two distinct stages: a starting stage that involves moving from the release position to a limit cycle, and a periodic stage that involves moving on the limit cycle. The initial orientation of the particle has a minimal impact on both stages of motion. In contrast, the time it takes for the particle to reach the limit cycle may vary depending on the release position. Furthermore, particles with a larger aspect ratio exhibit a greater maximum velocity magnitude; an increase in particle size causes the particle trajectory to contract more toward the center of the cavity, decreasing the centrifugal force experienced by the particle.