Influence of the turbulence structure on the particle sedimentation in wall-bounded flows
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In this paper we analyze the influence of the particle Froude number in the settling velocity of particles in wall-bounded turbulence. We consider dilute situations using point-particle direct numerical simulations, neglecting the modifications of the flow by the particles (one-way coupling). We compare our results with the cases of particles settling around a single vortex and a vortex array. The behavior of the settling velocity in the wall-bounded turbulence case is found to be similar to the one of particles settling in a vortex array with a “large” inter-vortex distance. We analyze how the particle settling velocity is related to the particle-fluid two-point velocity correlations.
KeywordsParticle Sedimentation Settling Velocity Turbulence Structure Vortex Center Single Vortex
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