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Numerical study of particle distribution in wake of liquid-particle flows past a circular cylinder using discrete vortex method. (English) Zbl 1178.76364
Summary: Particle-laden water flows past a circular cylinder are numerically investigated. The discrete vortex method (DVM) is employed to evaluate the unsteady water flow fields and a Lagrangian approach is applied for tracking individual solid particles. A dispersion function is defined to represent the dispersion scale of the particle. The wake vortex patterns, the distributions and the time series of dispersion functions of particles with different Stokes numbers are obtained. Numerical results show that the particle distribution in the wake of the circular cylinder is closely related to the particle’s Stokes number and the structure of wake vortices: (1) the intermediate sized particles with Stokes numbers, St, of 0.25, 1.0 and 4.0 can not enter the vortex cores and concentrate near the peripheries of the vortex structures, (2) in the circular cylinder wake, the dispersion intensity of particles decreases as St is increased from 0.25 to 4.0.

MSC:
76T20 Suspensions
76M23 Vortex methods applied to problems in fluid mechanics
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