2021 年 35 巻 1 号 p. 125-133
We have simulated the motion of particle assemblage passing through fibrous media. On the assumption that the particle size is of the order of micrometers, the velocity of individual particles was calculated by use of the Stokesian dynamics that describes the Stokes flow in the presence of multiple particles. The results show that a part of particles is captured by fibers while others avoid them and permeate the media. From the velocity, traveling distance and direction of the particles which are not captured, the diffusion caused by the hydrodynamic interaction was observed. The results indicated that the motion of each particle greatly differs depending on the particle size particularly for the large fiber volume fraction, which would be closely related to the hydrodynamic diffusive behavior.