TY - CHAP
T1 - Fluid dynamics of self-propelled microorganisms, from individuals to concentrated populations
AU - Cisneros, Luis H.
AU - Cortez, Ricardo
AU - Dombrowski, Christopher
AU - Goldstein, Raymond E.
AU - Kessler, John O.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
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U2 - 10.1007/978-3-642-11633-9_10
DO - 10.1007/978-3-642-11633-9_10
M3 - Chapter
AN - SCOPUS:84886130608
SN - 9783642116322
SP - 99
EP - 115
BT - Animal Locomotion
PB - Springer Berlin Heidelberg
ER -