title: Suppressing turbulence of self-propelling rods by strongly coupled passive particles.
abstract: The strong turbulence suppression, mainly for large-scale modes, of two-dimensional self-propelling rods, by increasing the long-range coupling strength Γ of low-concentration passive particles, is numerically demonstrated. It is found that large-scale collective rod motion in forms of swirls or jets is mainly contributed from well-aligned dense patches, which can push small poorly aligned rod patches and uncoupled passive particles. The more efficient momentum transfer and dissipation through increasing passive particle coupling leads to the formation of a more ordered and slowed down network of passive particles, which competes with coherent dense active rod clusters. The frustration of active rod alignment ordering and coherent motion by the passive particle network, which interrupt the inverse cascading of forming large-scale swirls, is the key for suppressing collective rod motion with scales beyond the interpassive distance, even in the liquid phase of passive particles. The loosely packed active rods are weakly affected by increasing passive particle coupling due to the weak rod-particle interaction. They mainly contribute to the small-scale modes and high-speed motion.
authors: Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China.
authors: Yen-Shuo
authors: YS
authors: Su
authors: Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China.
authors: Hao-Chen
authors: HC
authors: Wang
authors: Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China.
authors: Lin
authors: L
authors: I
mesh_terms: D008962:Models, Theoretical; D009038:Motion