Falling Particles in Fluids at Intermediate Reynolds Numbers

Details Falling Particles in Fluids at Intermediate Reynolds Numbers Falling Particles in Fluids at Intermediate Reynolds Numbers

2010-10-18

arxiv.org/abs/1010.3741v1

Physics

Fluid Dynamics

short film < 3min

Scientific paper

In this video, we present the dynamics of an array of falling particles at intermediate Reynolds numbers. The film shows the vorticity plots of 3, 4, 7, 16 falling particles at $Re = 200$. We highlight the effect of parity on the falling configuration of the array. In steady state, an initially uniformly spaced array forms a convex shape when $n=3$, i.e the middle particle leads, but forms a concave shape when $n = 4$. For larger odd numbers of particles, the final state consists of a mixture of concave and convex shapes. For larger even numbers of particles, the steady state remains a concave shape. Below a threshold of initial particle spacing, particles cluster in groups of 2 to 3.

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