Collective dynamics of densely confined active polar disks with self- and mutual alignment
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913027587047424 |
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| author | Tang, Weizhen Zheng, Yating Shee, Amir Lin, Guozheng Han, Zhangang Romanczuk, Pawel Huepe, Cristián |
| author_facet | Tang, Weizhen Zheng, Yating Shee, Amir Lin, Guozheng Han, Zhangang Romanczuk, Pawel Huepe, Cristián |
| contents | We study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactions, while also displaying mutual alignment with neighbors due to having its center of rotation located a distance R behind its centroid so that central contact forces can also introduce torques. The effect of both alignment mechanisms produces a variety of collective states that combine high-frequency localized circular oscillations with low-frequency milling around the center of the arena, in fluid or solid regimes. We consider cases with small/large R values, isotropic/anisotropic disk-substrate damping, smooth/rough arena boundaries, different densities, and multiple systems sizes, showing that the emergent collective states that we identify are robust, generic, and potentially observable in real-world natural or artificial systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_13705 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Collective dynamics of densely confined active polar disks with self- and mutual alignment Tang, Weizhen Zheng, Yating Shee, Amir Lin, Guozheng Han, Zhangang Romanczuk, Pawel Huepe, Cristián Soft Condensed Matter We study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactions, while also displaying mutual alignment with neighbors due to having its center of rotation located a distance R behind its centroid so that central contact forces can also introduce torques. The effect of both alignment mechanisms produces a variety of collective states that combine high-frequency localized circular oscillations with low-frequency milling around the center of the arena, in fluid or solid regimes. We consider cases with small/large R values, isotropic/anisotropic disk-substrate damping, smooth/rough arena boundaries, different densities, and multiple systems sizes, showing that the emergent collective states that we identify are robust, generic, and potentially observable in real-world natural or artificial systems. |
| title | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2410.13705 |