A new and effective Lagrangian-Lagrangian model based on the integration of Discrete Vortex Method (DVM) and particle collision model is proposed to study the interaction between large eddies and particle cloud in turbulent shear layer behind the circular cylinders. Two-phase calculation is coupled together with concept of sub circulation method to adjust timestep, so the DVM calculation is in accordance with particle tracking. Based on the validity by analyzing the particle trajectory in Rankine vortex flow, this method is applied to simulate the horizontal particle transport process in high Reynolds turbulent flow across circular cylinders for the particle sedimentation, entrainment and concentration process.And the particles distribution is investigated under different Stokes Number when the mean velocity is in the same direction with gravity. When the Stokes Number is far less than 1,particles are entrapped easily by vortex and finally concentrate near the outer edges of vortex structure due to the their quick response to the flow field. With increasing Stokes Number,particles respond more slowly to the flow field, and thus the influence of gravity is stronger. When Stokes Number is far larger than 1, vortex structure has little influence on the particle distribution and it presents in a similar way with the distribution of flee sedimentation.
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