Jain, P and Rana, N and Ramaswamy, S and Perlekar, P (2024) Inertia Drives Concentration-Wave Turbulence in Swimmer Suspensions. In: Physical Review Letters, 133 (15).
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Abstract
We discover an instability mechanism in suspensions of self-propelled particles that does not involve active stress. Instead, it is driven by a subtle interplay of inertia, swimmer motility, and concentration fluctuations, through a crucial time lag between the velocity and the concentration field. The resulting time-persistent state seen in our high-resolution numerical simulations consists of self-sustained waves of concentration and orientation, transiting from regular oscillations to wave turbulence. We analyze the statistical features of this active turbulence, including an intriguing connection to the Batchelor spectrum of passive scalars. © 2024 American Physical Society.
| Item Type: | Journal Article |
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| Publication: | Physical Review Letters |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Statistical mechanics; Turbulence models, Active stress; Concentration fields; Concentration fluctuation; Concentration waves; High-resolution numerical simulation; Instability mechanisms; Persistent state; Self-propelled particles; Time lag; Wave turbulence, Suspensions (components) |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 09 Nov 2024 17:46 |
| Last Modified: | 09 Nov 2024 17:46 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86666 |
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