Front structure and dynamics in dense colonies of motile bacteria: Role of active turbulence
| Autor: | Rayan Chatterjee, Prasad Perlekar, Abhijeet A. Joshi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Motile bacteria
Scalar (mathematics) Direct numerical simulation FOS: Physical sciences Condensed Matter - Soft Condensed Matter Bacterial Physiological Phenomena 01 natural sciences Models Biological 010305 fluids & plasmas Physics::Fluid Dynamics Motion 0103 physical sciences Lagrangian coherent structures Computer Simulation Physics - Biological Physics 010306 general physics Physics Bacteria Turbulence Fluid Dynamics (physics.flu-dyn) Collective motion Mechanics Physics - Fluid Dynamics Nonlinear Sciences - Chaotic Dynamics Biological Physics (physics.bio-ph) Soft Condensed Matter (cond-mat.soft) Chaotic Dynamics (nlin.CD) Bacterial colony |
| Zdroj: | Physical review. E. 94(2-1) |
| ISSN: | 2470-0053 |
| Popis: | We study the spreading of a bacterial colony undergoing turbulent like collective motion. We present two minimalistic models to investigate the interplay between population growth and coherent structures arising from turbulence. Using Direct Numerical Simulation (DNS) of the proposed models we find that turbulence has two prominent effects on the spatial growth of the colony: (a) the front speed is enhanced, and (b) the front gets crumpled. Both these effects, which we highlight by using statistical tools, are markedly different in our two models. We also show that the crumpled front structure and the passive scalar fronts in random flows are related in certain regimes. 9 pages, 8 figures |
| Databáze: | OpenAIRE |
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