Flocking and mesoscale turbulence in three-dimensional active fluids
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866914277838815232 |
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| author | Perlekar, Prasad |
| author_facet | Perlekar, Prasad |
| contents | We numerically study the three-dimensional turbulence in a minimal model of an active fluid--the Toner-Tu-Swift-Hohenburg equation. For small activity, we observe bacterial turbulence, while for large activity, we uncover hitherto unexplored regime of a turbulent flock where a global order coexists with turbulence. We present a simple closure model that predicts the turbulent flock and also qualitatively explains the transition to the bacterial turbulence regime via a transcritical bifurcation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_17674 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Flocking and mesoscale turbulence in three-dimensional active fluids Perlekar, Prasad Fluid Dynamics Soft Condensed Matter We numerically study the three-dimensional turbulence in a minimal model of an active fluid--the Toner-Tu-Swift-Hohenburg equation. For small activity, we observe bacterial turbulence, while for large activity, we uncover hitherto unexplored regime of a turbulent flock where a global order coexists with turbulence. We present a simple closure model that predicts the turbulent flock and also qualitatively explains the transition to the bacterial turbulence regime via a transcritical bifurcation. |
| title | Flocking and mesoscale turbulence in three-dimensional active fluids |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2601.17674 |