Short-range Interaction between Solids in Solid-Liquid Flow

Abstract

In solid-fluid two phase flows, the interaction between particles and particle-wall play important roles. They are deeply related not only to individual motions of the particle but to the formation of meso-scale structure such as particle clouds. Therefore the foundamental study on the interaction of particles has been required for modeling the solid-fluid flow. In this paper, theoretical models of short-range interaction between solids in fluid are briefly reviewed. Then we describe the direct simulation of the sedimentation of a solid particle toward a wall, and discuss the fluid force acting on the particle at finite Reynolds number. Furthermore, it is shown that the fluid effects due to the unsteady motion of the particle are significant role on short-range interaction in liquid.