Numerical study on the effect of vortices upon particle motion in unsteady and unstable liquid-particle two-phase flows

We present a numerical investigation on the two dimensional liquid particle two phase flows passing a circular cylinder at high Reynolds number.Here we apply the discrete vortex method(DVM) to compute the unsteady and unstable water flows, and adopt a Lagrangian approach to simulate the particle motion in flows.We numerically demonstrate that the definite interrelated structure exists in the particle motion and the vortices in liquid particle two phase flows:the motion of intermediate size particles is obviously influenced by the vortices.When water passes a circular cylinder at high Reynolds number, the unstable flow with massive separation is formed, the complicated motion of vortices exists in the wake region.The intermediate size particles are separated from the liquid particle mixture, then move toward the wake vortex region, finally accumulate in the vortex structures.