Controlling Vortex Rotation in Dry Active Matter
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910212522246144 |
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| author | Júnior, Felipe P. S. Domingos, Jorge L. C. Ferreira, W. P. Potiguar, F. Q. |
| author_facet | Júnior, Felipe P. S. Domingos, Jorge L. C. Ferreira, W. P. Potiguar, F. Q. |
| contents | We investigate the rotation of a vortex around a circular obstacle in dry active matter in the presence of M half-circles distributed around the obstacle. To quantify this effect, we define the parameter ΠM , which is the ratio between the mean angular velocity of the controlled vortex and the root-mean-square angular velocity of the isolated vortex. We identify two rotational regimes determined by the obstacle configuration. In the first regime, where ΠM < 0 corresponding to the flat side of the half-circles facing the vortex, the rotation is clockwise. In the second regime (ΠM > 0), it corresponding to the curved sides facing the vortex, the rotation becomes counterclockwise. We further analyze the impact of this control on vortex stability, showing that the configuration of semi-circles can enhance or suppress stability depending on their geometry and distance from the central obstacle. Our results demonstrate a possible setup to control the spontaneous rotation of dry active matter around circular obstacles. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_00642 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlling Vortex Rotation in Dry Active Matter Júnior, Felipe P. S. Domingos, Jorge L. C. Ferreira, W. P. Potiguar, F. Q. Soft Condensed Matter Statistical Mechanics We investigate the rotation of a vortex around a circular obstacle in dry active matter in the presence of M half-circles distributed around the obstacle. To quantify this effect, we define the parameter ΠM , which is the ratio between the mean angular velocity of the controlled vortex and the root-mean-square angular velocity of the isolated vortex. We identify two rotational regimes determined by the obstacle configuration. In the first regime, where ΠM < 0 corresponding to the flat side of the half-circles facing the vortex, the rotation is clockwise. In the second regime (ΠM > 0), it corresponding to the curved sides facing the vortex, the rotation becomes counterclockwise. We further analyze the impact of this control on vortex stability, showing that the configuration of semi-circles can enhance or suppress stability depending on their geometry and distance from the central obstacle. Our results demonstrate a possible setup to control the spontaneous rotation of dry active matter around circular obstacles. |
| title | Controlling Vortex Rotation in Dry Active Matter |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2511.00642 |