简单的集群游动者通过流体动力学相互作用产生二维稳定的自组织

群游鱼群连续模型中的行波

Traveling waves in a continuum model of schooling swimmers

通过连续介质理论，研究鱼群中由非定常水动力相互作用导致的行波解，发现均匀状态在特定密度下失稳并形成稳定行波。

Collective entrainment and confinement amplify transport by schooling micro-swimmers

Micro-swimmers can serve as cargo carriers that move deep inside complex flow networks. When a school collectively entrains the surrounding fluid, their transport capacity can be enhanced. This effect is quantified with good agreement between experiments with self-propelled droplets and a confined Brinkman squirmer model. The volume of liquid entrained can be much larger than the droplet itself, amplifying the effective cargo capacity over an order of magnitude, even for dilute schools. Hence, biological and engineered swimmers can efficiently transport materials into confined environments.

Learning to school in the presence of hydrodynamic interactions

Schooling, an archetype of collective behavior, emerges from the interactions of fish responding to visual and other informative cues mediated by their aqueous environment. In this context, a fundamental and largely unexplored question concerns the role of hydrodynamics. Here, we investigate schooling by modeling swimmers as vortex dipoles whose interactions are governed by the Biot-Savart law. When we enhance these dipoles with behavioral rules from classical agent based models we find that they do not lead robustly to schooling due to flow mediated interactions. In turn, we present dipole sw…

类似金枪鱼的游动者体验流体介导的稳定并排形成

Tuna-Like Swimmers Experience a Fluid-Mediated Stable Side-by-Side Formation

基于金枪鱼的生物机器人通过流体通道效应实现稳定并排游动，其稳定性不受相位同步影响，且对运输成本影响较小。

How swimming style affects schooling of two fish-like wavy hydrofoils

Fish swimming style and schooling behaviour are two important aspects of underwater locomotion. How swimming style affects fish schooling is investigated by a representative problem setup consisting of two tethered NACA0012 hydrofoils undulating in a free stream flow at various wavelengths $ λ^* = 0.8 - 8 $, front-back distance $ D = 0,\ 0.25,\ 0.5,\ 0.75 $, phase difference $ ϕ/π= 0,\ 0.5,\ 1,\ 1.5 $, and lateral gap distance $ G = 0.25,\ 0.3,\ 0.35 $ with fixed Reynolds number $ Re = 5000 $, Strouhal number $ St = 0.4 $, and maximum amplitude $ A_{max} = 0.1 $. In total, 336 cases were simul…

School cohesion, speed, and efficiency are modulated by the swimmers flapping motion

Fish schools are ubiquitous in marine life. Although flow interactions are thought to be beneficial for schooling, their exact effects on the speed, energetics, and stability of the group remain elusive. Recent experiments suggest that flow interactions stabilize in-tandem formations of heaving foils. Here, we propose a minimal approach based on the vortex sheet model that captures salient features of the flow interactions among flapping swimmers, and we study the free swimming of a pair of in-line swimmers driven with identical heaving or pitching motions. We find that, independent of the fla…