Fluid dynamics of self-propelled microorganisms, from individuals to concentrated populations

Luis H. Cisneros, Ricardo Cortez, Christopher Dombrowski, Raymond E. Goldstein, John O. Kessler

Research output: Chapter in Book/Report/Conference proceedingChapter

10 Scopus citations


Nearly close-packed populations of the swimming bacterium Bacillus subtilis form a collective phase, the Zooming BioNematic (ZBN). This state exhibits largescale orientational coherence, analogous to the molecular alignment of nematic liquid crystals, coupled with remarkable spatial and temporal correlations of velocity and vorticity, as measured by both novel and standard applications of particle imaging velocimetry. The appearance of turbulent dynamics in a system which is nominally in the regime of Stokes flow can be understood by accounting for the local energy input by the swimmers, with a new dimensionless ratio analogous to the Reynolds number. The interaction between organisms and boundaries, and with one another, is modeled by application of the methods of regularized Stokeslets.

Original languageEnglish (US)
Title of host publicationAnimal Locomotion
PublisherSpringer Berlin Heidelberg
Number of pages17
ISBN (Print)9783642116322
StatePublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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