期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.188101
关键词
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资金
- Schlumberger Chair
- BBSRC
- U.S. DOE, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE AC02-06CH11357]
- European Research Council [247333]
- Biotechnology and Biological Sciences Research Council [BB/F021844/1] Funding Source: researchfish
- BBSRC [BB/F021844/1] Funding Source: UKRI
In dilute suspensions of swimming microorganisms the local fluid velocity is a random superposition of the flow fields set up by the individual organisms, which in turn have multipole contributions decaying as inverse powers of distance from the organism. Here we show that the conditions under which the central limit theorem guarantees a Gaussian probability distribution function of velocities are satisfied when the leading force singularity is a Stokeslet, but are not when it is any higher multipole. These results are confirmed by numerical studies and by experiments on suspensions of the alga Volvox carteri, which show that deviations from Gaussianity arise from near-field effects.
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