Dynamics of a Passive Droplet in Active Turbulence
arXiv:2307.12589 · doi:10.1038/s41467-024-47727-1
Abstract
We numerically study the effect of an active turbulent environment on a passive deformable droplet. The system is simulated using coupled hydrodynamic and nematodynamic equations for nematic liquid crystals with an active stress which is non-zero outside the droplet, and is zero inside. The droplet undergoes deformation fluctuations and its movement shows periods of ``runs" and ``stays". The mean square displacement of the geometric center of the droplet shows an extended ballistic regime and a transition to normal diffusive regime which depends on the size of the droplet. We relate this transition with a temporal scale associated with velocity autocorrelation function of the droplet trajectories, and with a spatial scale associated with one-time two-point velocity correlation function of the surrounding active medium. As the radius is decreased below the integral length scale, the velocity autocorrelation time of trajectories increases and the transition to normal diffusion is delayed.
References in corpus (39)
- Active Particles in Complex and Crowded Environments
- Physics of Microswimmers - Single Particle Motion and Collective Behavior
- Meso-scale turbulence in living fluids
- How far from equilibrium is active matter?
- Does the 1/f frequency-scaling of brain signals reflect self-organized critical states?
- Orientational order of motile defects in active nematics
- Active Turbulence
- Generalized energy equipartition in harmonic oscillators driven by active baths
- Fluctuations and Rheology in Active Bacterial Suspensions
- Spontaneous division and motility in active nematic droplets
- Induced Diffusion of Tracers in a Bacterial Suspension: Theory and Experiments
- Universal scaling of active nematic turbulence
- Inertial self-propelled particles
- Colloids in a bacterial bath: simulations and experiments
- Diffusion of an ellipsoid in bacterial suspensions
- Banding, Excitability and Chaos in Active Nematic Suspensions
- Loopy Lévy flights enhance tracer diffusion in active suspensions
- Active turbulence in active nematics
- The Anomalous Transport of Tracers in Active Baths
- Fluctuating motion in an active environment
- Active Ornstein-Uhlenbeck model for self-propelled particles with inertia
- Lévy Fluctuations and Tracer Diffusion in Dilute Suspensions of Algae and Bacteria
- Directional self-locomotion of active droplets enabled by nematic environment
- Anomalous diffusion and Lévy walks distinguish active from inertial turbulence
- Multi-scale statistics of turbulence motorized by active matter
- Colloids in active fluids: Anomalous micro-rheology and negative drag
- Rectified Rotational Dynamics of Mobile Inclusions in Two-Dimensional Active Nematics
- Lamellar ordering, droplet formation and phase inversion in exotic active emulsions
- Effective Langevin equations for a polar tracer in an active bath
- Levitation of non-magnetizable droplet inside ferrofluid
- Enhanced diffusion of a tracer particle in a lattice model of a crowded active system
- Friction Scaling Laws for Transport in Bacterial Turbulence
- Vorticity Determines the Force on Bodies Immersed in Active Fluids
- Active nematics on flat surfaces: from droplet motility and scission to active wetting
- Scaling regimes of active turbulence with external dissipation
- Coexistence of active and hydrodynamic turbulence in two dimensional active nematics
- Anchoring-driven spontaneous rotations in active gel droplets
- Enhanced orientational ordering induced by active yet isotropic bath
- Shear dynamics of an inverted nematic emulsion