Equilibrium position, as well as dynamic patterns of suspended particles, plays a dominant role in particle manipulation of segregation, transporting, or sorting. The current paper aims to investigate the falling manners of non-circular particles in an enclosure while the pulsatile flow is involved as a counter-flow. The direct-forcing immersed boundary method is coupled with the lattice Boltzmann method to simulate this widespread issue numerically. Corresponding boundary conditions are hired to take into account pulsatile flow. Findings were first successfully verified against the existing literature and the accuracy of the results is well-demonstrated. For the first time, a series of proof-of-principal simulations with an increased level of geometric complexity, particle aspect ratio, as well as the number and initial configuration (release positions), is carried out. The force resulting from the particle acceleration is also considered. It is shown that considering such factors, particle settling manners would markedly differ. The collective behavior of particles is also studied, and it is revealed that the presence of neighboring particles makes the influence of the particle shape less clear; however, pulsatile flow presents considerable differences in the settling manners of particles.

平衡位置以及悬浮颗粒的动态模式在分离、运输或分选的颗粒操作中起主导作用。本论文旨在研究非圆形颗粒在外壳中的下落方式，而脉动流作为逆流涉及。直接强迫浸没边界法与格子玻尔兹曼法相结合，对这一普遍存在的问题进行数值模拟。采用相应的边界条件来考虑脉动流。研究结果首先成功地与现有文献进行了验证，结果的准确性得到了很好的证明。首次进行了一系列原理验证模拟，其几何复杂性、粒子纵横比、以及数量和初始配置（释放位置），进行。还考虑了由粒子加速产生的力。结果表明，考虑到这些因素，颗粒沉降方式会显着不同。还研究了粒子的集体行为，发现相邻粒子的存在使粒子形状的影响不太明显；然而，脉动流在颗粒的沉降方式上存在很大差异。并且发现相邻粒子的存在使得粒子形状的影响不太明显；然而，脉动流在颗粒的沉降方式上存在很大差异。并且发现相邻粒子的存在使得粒子形状的影响不太明显；然而，脉动流在颗粒的沉降方式上存在很大差异。