Fluid dynamics of bacterial turbulence

Abstract

Self-sustained turbulent structures have been observed in a wide range of living fluids, yet no quantitative theory exists to explain their properties. We report experiments on active turbulence in highly concentrated 3D suspensions of Bacillus subtilis and compare them with a minimal fourth-order vector-field theory for incompressible bacterial dynamics. Velocimetry of bacteria and surrounding fluid, determined by imaging cells and tracking colloidal tracers, yields consistent results for velocity statistics and correlations over two orders of magnitude in kinetic energy, revealing a decrease of fluid memory with increasing swimming activity and linear scaling between energy and enstrophy. The best-fit model parameters allow for quantitative agreement with experimental data.

5 pages, 4 figures

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• Green Algae as Model Organisms for Biological Fluid Dynamics
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• Anomalous chained turbulence in actively driven flows on spheres
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• Stochastic Hydrodynamics of Complex Fluids: Discretisation and Entropy Production
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• Understanding Contagion Dynamics through Microscopic Processes in Active Brownian Particles
• Hydrodynamic Synchronisation of Chiral Microswimmers
• Stochastic cycle selection in active flow networks
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• Towards an analytical description of active microswimmers in clean and in surfactant-covered drops
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• Effects of confinement on the dynamics and correlation scales in active fluids
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• Dynamics of Deformable Active Particles under External Flow Field
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• Dynamics of a simple model microswimmer in an anisotropic fluid: implications for alignment behavior and active transport in a nematic liquid crystal
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