Lattices of Hydrodynamically Interacting Flapping Swimmers

@article{Oza2019LatticesOH,
  title={Lattices of Hydrodynamically Interacting Flapping Swimmers},
  author={Anand Uttam Oza and Leif Ristroph and Michael J. Shelley},
  journal={Physical Review X},
  year={2019}
}
Fish schools and bird flocks exhibit complex collective dynamics whose self-organization principles are largely unknown. The influence of hydrodynamics on such collectives has been relatively unexplored theoretically, in part due to the difficulty in modeling the temporally long-lived hydrodynamic interactions between many dynamic bodies. We address this through a novel discrete-time dynamical system (iterated map) that describes the hydrodynamic interactions between flapping swimmers arranged… 

Figures from this paper

Two-dimensionally stable self-organization arises in simple schooling swimmers through hydrodynamic interactions

We present new constrained and free-swimming experiments and simulations of a pair of pitching hydrofoils interacting in a minima school. The hydrofoils have an out-of-phase synchronization and they

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

Abstract 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

Collective Synchronization of Undulatory Movement through Contact

Many biological systems synchronize their movement through physical interactions. By far, the most well-studied examples concern physical interactions through a fluid: Beating cilia, swimming sperm

Vortex phase matching as a strategy for schooling in robots and in fish

TLDR
Bio-mimetic fish-like robots are developed which allow us to measure directly the energy consumption associated with swimming together in pairs and find that followers, in any relative position to a near-neighbour, could obtain hydrodynamic benefits if they exhibit a tailbeat phase difference that varies linearly with front-back distance.

Collective locomotion of two-dimensional lattices of flapping plates. Part 2. Lattice flows and propulsive efficiency

  • S. Alben
  • Physics
    Journal of Fluid Mechanics
  • 2021
Abstract We study propulsion of rectangular and rhombic lattices of flapping plates at $O$(10–100) Reynolds numbers in incompressible flow. The fluid dynamics often converges to time periodic in 5–30

Density dependent synchronization in contact-coupled oscillators.

Many biological systems can synchronize their movement through physical interactions, which are often through a fluid. However, the role of intermittent mechanical contact in collective oscillatory

Capillary surfers: wave-driven particles at a fluid interface

Active systems have recently attracted considerable interest for the possibility of extending statistical mechanics to incorporate non-equilibrium phenomena [1,2]. Among active systems,

Collective locomotion of two-dimensional lattices of flapping plates. Part 1. Numerical method, single-plate case and lattice input power

  • S. Alben
  • Engineering
    Journal of Fluid Mechanics
  • 2021
Abstract We propose a model and numerical method for the propulsion of rectangular and rhombic lattices of flapping plates at $O$(10–100) Reynolds numbers in incompressible flow. The numerical method

Mitigating memory effects during undulatory locomotion on hysteretic materials

TLDR
This study reveals how memory effects stymied the locomotion of a diversity of snakes in previous studies and suggests the existence of a predictive model for history-dependent granular physics.

Modeling and simulation of sheets ply separation induced by air flow

The purpose of this paper is to investigate the mechanism of sheets ply separation induced by air flow through numerical simulation with two-way FSI (fluid-structure interaction) simulation using

References

SHOWING 1-10 OF 87 REFERENCES

Hydrodynamic schooling of flapping swimmers

TLDR
Simulations show that swimming in a group can enhance speed and save power, and show that fluid dynamic interactions alone are sufficient to generate coherent collective locomotion, and thus might suggest new ways to characterize the role of flows in animal groups.

The hydrodynamic advantages of synchronized swimming in a rectangular pattern

TLDR
Using large-eddy simulations of self-propelled synchronized swimmers in various rectangular patterns, evidence is found in support of the channeling effect, which enhances the flow velocity betweenSwimmers in the direction of swimming as the lateral distance between swimmers decreases.

Flow interactions between uncoordinated flapping swimmers give rise to group cohesion

TLDR
Results show how flapping kinematics can be used to control locomotion within wakes, and that flow interactions provide a mechanism which promotes group cohesion.

Learning to school in the presence of hydrodynamic interactions

TLDR
It is proposed to use swimmers equipped with adaptive decision-making that adjust their gaits through a reinforcement learning algorithm in response to nonlinearly varying hydrodynamic loads to identify schooling patterns that minimize the individual and collective swimming effort.

Model of Collective Fish Behavior with Hydrodynamic Interactions.

TLDR
A novel model that couples behavioral rules with far-field hydrodynamic interactions is proposed and shows that a new "collective turning" phase emerges, and on average, individuals swim faster thanks to the fluid, and the flow enhances behavioral noise.

Large-Scale Patterns in a Minimal Cognitive Flocking Model: Incidental Leaders, Nematic Patterns, and Aggregates.

TLDR
Combining simulations and nonlinear field equations, it is shown that position-based active models, as the one analyzed here, represent a new class of active systems fundamentally different from other active systems, including velocity-alignment-based flocking systems.

Optimal undulatory swimming for a single fish-like body and for a pair of interacting swimmers

We establish through numerical simulation conditions for optimal undulatory propulsion for a single fish, and for a pair of hydrodynamically interacting fish, accounting for linear and angular

Collective States, Multistability and Transitional Behavior in Schooling Fish

TLDR
This study demonstrates that collective motion can be effectively mapped onto a set of order parameters describing the macroscopic group structure, revealing the existence of at least three dynamically-stable collective states; swarm, milling and polarized groups.

Efficient collective swimming by harnessing vortices through deep reinforcement learning

TLDR
This study confirms that fish may harvest energy deposited in vortices and support the conjecture that swimming in formation is energetically advantageous and demonstrates that deep RL can produce navigation algorithms for complex unsteady and vortical flow fields, with promising implications for energy savings in autonomous robotic swarms.

Collective motion and density fluctuations in bacterial colonies

TLDR
This work reports simultaneous measurements of the positions, velocities, and orientations as a function of time for up to a thousand wild-type Bacillus subtilis bacteria in a colony, demonstrating that bacteria are an excellent system to study the general phenomenon of collective motion.
...