We have examined the behavior of a suspended solid particle floating in a fluid and interacting with circular cylinders inside a channel. The interaction of particles with cylinders, outer boundary and with the fluid is analyzed. Solid particles move freely in the fluid along a fixed computational mesh using an Eulerian approach. Treatment of fluid and particle interaction is achieved using the fictitious boundary method (FBM). A modification in the collision model, proposed by Singh, Glowinski, Joseph, and coauthors, is presented to handle particle-cylinder interactions. The particulate flow is computed using multigrid finite element solver FEATFLOW (Finite element analysis tool for flow problems). Numerical experiments are performed considering different particle positions and different alignments of cylinders and their effect on particle trajectories has been studied. Effects of the particle-wall, particle-cylinder and particle-fluid interaction on the motion of the particles and on the physical behavior of the fluid-particle system have been analyzed. Results for the sharp increase in the amplitude of drag forces on the cylinders, arising due to a nearby passing particle have been presented.

我们研究了悬浮在流体中的悬浮固体颗粒的行为，并与通道内的圆柱体相互作用。分析了粒子与圆柱体、外边界和流体的相互作用。固体粒子使用欧拉方法沿着固定的计算网格在流体中自由移动。流体和粒子相互作用的处理是使用虚拟边界法 (FBM) 实现的。由 Singh、Glowinski、Joseph 和合著者提出的碰撞模型的修改被提出来处理粒子-圆柱体相互作用。使用多网格有限元求解器 FEATFLOW（流动问题的有限元分析工具）计算颗粒流。考虑到不同的粒子位置和不同的圆柱体排列进行了数值实验，并研究了它们对粒子轨迹的影响。分析了粒子-壁面、粒子-圆柱体和粒子-流体相互作用对粒子运动和流体-粒子系统物理行为的影响。已经呈现了由于附近通过的粒子而引起的圆柱体上阻力幅度急剧增加的结果。