Dynamics of a neutrally-buoyant elliptic particle in a square cavity with two adjacent moving walls: A lattice Boltzmann simulation

This study investigates the dynamics of a neutrally buoyant elliptical particle in a cavity with two adjacent moving walls, employing the Lattice Boltzmann Method (LBM) coupled with an improved smoothed profile method. The influence of Reynolds number, initial position and orientation, aspect ratio, and relative size on the particle's limit cycle is analyzed in two distinct scenarios: converging walls and diverging walls. The results demonstrate that the initial orientation and position of the particles significantly affect their trajectories, particularly in the converging wall case, where particles interact dynamically with the evolving vortex structures. The aspect ratio of the particle also plays a critical role, with increased elongation leading to more complex trajectories. Overall, this research enhances the understanding of how particle shape and flow conditions influence the behavior of rigid macro-particles in fluid flows, which has implications for various applications in microfluidics and biomedical engineering.