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arXiv · 2603.20736

Channel Flow Around an Obstacle in a Two-Dimensional Soft Particles

Bahaa Mazloum·Alexandre Stepanetz·Benjamin Dollet·Misaki Ozawa
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Abstract

We numerically study confined channel flow around an obstacle using a two-dimensional soft par- ticle model, inspired by experiments performed in the same geometry. We systematically vary the polydispersity, the external driving force, and the packing fraction of the system. Our simulations capture a broad range of plastic flow phenomenologies, from highly directional, sliding-like motion characteristic of crystalline materials to more isotropic and localized rearrangements typical of amor- phous systems. We identify a threshold value of polydispersity that marks the crossover between crystalline-like and amorphous-like plasticity. In addition, we observe the existence of a critical ex- ternal force, associated with the phenomenon of yield drag, above which the system reaches steady flow and below which it remains arrested. We determine a critical packing fraction above which such yield-drag behavior emerges. Our results provide a comprehensive framework for understanding the interplay between disorder, driving, and the presence of an obstacle in channel flows.

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Bahaa Mazloum, Alexandre Stepanetz, Benjamin Dollet, Misaki Ozawa. 2026-03-21. Channel Flow Around an Obstacle in a Two-Dimensional Soft Particles. https://doi.org/10.1103/qy1b-d59q

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