STUDY ON THE INTERACTION OF SEDIMENTING CYLINDRICAL PARTICLES IN STILL FLUID

摘要

The sedimentations of two cylindrical particles in three different initial relative positions are numerically simulated using the lattice Boltzmann method. The movement characteristics and particle interactions during their sedimentation are presented and discussed in detail. The results show that, (i) if the two particles are released parallel but separated horizontally, they push away each other, rotate inwards and separate horizontally as they fall; (ii) if the two particles are released.parallel but separated vertically, the sedimentation behavior can be classified into three stages: trailing,tumbling and separating; (iii) if the two particles are released perpendicular but separated vertically,the sedimentation behavior can be characterized as: trailing and rotating, touching and sliding. In order to validate our simulation, experiments were also conducted and the results agree well with the numerical ones.