Emergence of Local Ordering and Mesoscale Giant Number Fluctuations in Active Turbulence
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914387233603584 |
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| author | Kashyap, Kirti Kiran, Kolluru Venkata Gupta, Anupam |
| author_facet | Kashyap, Kirti Kiran, Kolluru Venkata Gupta, Anupam |
| contents | We study spatiotemporal chaos in two-dimensional dense active suspensions using a generalized hydrodynamic model. Increasing activity induces a structural transition marked by the formation of intense vortices and giant number fluctuations at the mesoscale. The flow self-organizes into locally polar-ordered regions coexisting with chaotic domains, producing a bimodal velocity distribution and enhanced correlations. This mixed-state morphology underlies the universal statistical behavior observed beyond a critical activity threshold. Reducing the instability timescale yields similar transitions, showing that both activity and instability act as control parameters for pattern formation. An energy-based order parameter derived from the system's budget quantifies and unifies these structural transitions across the phase space of activity and instability timescales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04890 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergence of Local Ordering and Mesoscale Giant Number Fluctuations in Active Turbulence Kashyap, Kirti Kiran, Kolluru Venkata Gupta, Anupam Fluid Dynamics We study spatiotemporal chaos in two-dimensional dense active suspensions using a generalized hydrodynamic model. Increasing activity induces a structural transition marked by the formation of intense vortices and giant number fluctuations at the mesoscale. The flow self-organizes into locally polar-ordered regions coexisting with chaotic domains, producing a bimodal velocity distribution and enhanced correlations. This mixed-state morphology underlies the universal statistical behavior observed beyond a critical activity threshold. Reducing the instability timescale yields similar transitions, showing that both activity and instability act as control parameters for pattern formation. An energy-based order parameter derived from the system's budget quantifies and unifies these structural transitions across the phase space of activity and instability timescales. |
| title | Emergence of Local Ordering and Mesoscale Giant Number Fluctuations in Active Turbulence |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2507.04890 |