Preferential Sampling and Small-Scale Clustering of Gyrotactic Microswimmers in Turbulence.
Phys Rev Lett
; 116(10): 108104, 2016 Mar 11.
Article
em En
| MEDLINE
| ID: mdl-27015512
ABSTRACT
Recent studies show that spherical motile microorganisms in turbulence subject to gravitational torques gather in down-welling regions of the turbulent flow. By analyzing a statistical model we analytically compute how shape affects the dynamics, preferential sampling, and small-scale spatial clustering. We find that oblong organisms may spend more time in up-welling regions of the flow, and that all organisms are biased to regions of positive fluid-velocity gradients in the upward direction. We analyze small-scale spatial clustering and find that oblong particles may either cluster more or less than spherical ones, depending on the strength of the gravitational torques.
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1
Base de dados:
MEDLINE
Assunto principal:
Natação
/
Sensação Gravitacional
/
Modelos Teóricos
/
Movimento
Tipo de estudo:
Risk_factors_studies
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article