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arXiv · 2607.16470

On the impact of clusters of rigid balls on the motion of a viscous fluid

Marco Bravin·Eduard Feireisl·Arnab Roy·Arghir Zarnescu
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Abstract

We develop a new approach to the problem of the motion of a large number of rigid bodies immersed in a viscous fluid. The leading idea is the concept of cluster - a collection of individual rigid objects that may be grouped or even connected in such a way that their collective impact on the bulk motion of the system is similar to that of a single body. The applications of the new approach include: 1. Improving the critical value of the number of balls of small radius such that their cloud has no impact on the limit system represented by the incompressible Navier--Stokes equations. 2. The balls follow the fluid flow in the asymptotic limit of vanishing radius and increasing number even if a gravitational force is imposed.

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Marco Bravin, Eduard Feireisl, Arnab Roy, Arghir Zarnescu. 2026-07-17. On the impact of clusters of rigid balls on the motion of a viscous fluid. https://arxiv.org/abs/2607.16470

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