Gyrotactic trapping in laminar and turbulent Kolmogorov flow (Articolo in rivista)

Type
Label
  • Gyrotactic trapping in laminar and turbulent Kolmogorov flow (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.4900956 (literal)
Alternative label
  • Francesco Santamaria (1); Filippo De Lillo (1); Massimo Cencini (2); Guido Boffetta (1) (2014)
    Gyrotactic trapping in laminar and turbulent Kolmogorov flow
    in Physics of fluids (1994)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Francesco Santamaria (1); Filippo De Lillo (1); Massimo Cencini (2); Guido Boffetta (1) (literal)
Pagina inizio
  • 111901 (literal)
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  • Published online 6 November 2014. (literal)
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  • http://scitation.aip.org/content/aip/journal/pof2/26/11/10.1063/1.4900956 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
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  • 17 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 11 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Dipartimento di Fisica and INFN, Università di Torino, via P. Giuria 1, 10125 Torino, Italy (2) Istituto dei Sistemi Complessi, CNR, via dei Taurini 19, 00185 Rome, Italy (literal)
Titolo
  • Gyrotactic trapping in laminar and turbulent Kolmogorov flow (literal)
Abstract
  • Phytoplankton patchiness, namely the heterogeneous distribution of microalgae over multiple spatial scales, dramatically impacts marine ecology. A spectacular example of such heterogeneity occurs in thin phytoplankton layers (TPLs), where large numbers of photosynthetic microorganisms are found within a small depth interval. Some species of motile phytoplankton can form TPLs by gyrotactic trapping due to the interplay of their particular swimming style (directed motion biased against gravity) and the transport by a flow with shear along the direction of gravity. Here we consider gyrotactic swimmers in numerical simulations of the Kolmogorov shear flow, both in laminar and turbulent regimes. In the laminar case, we show that the swimmer motion is integrable and the formation of TPLs can be fully characterized by means of dynamical systems tools. We then study the effects of rotational Brownian motion or turbulent fluctuations (appearing when the Reynolds number is large enough) on TPLs. In both cases, we show that TPLs become transient, and we characterize their persistence. (literal)
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