Inertia drives concentration-wave turbulence in swimmer suspensions

Autor:	Jain, Purnima, Rana, Navdeep, Ramaswamy, Sriram, Perlekar, Prasad
Rok vydání:	2024
Předmět:	Condensed Matter - Soft Condensed Matter Condensed Matter - Statistical Mechanics Physics - Fluid Dynamics
Druh dokumentu:	Working Paper
Popis:	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. Comment: 11 pages and 9 figures including supplementary material
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2401.11927 Zobrazit plný text záznamu View this record from Arxiv