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  1. Pubblicazioni

Alignment of Nonspherical Active Particles in Chaotic Flows

Articolo
Data di Pubblicazione:
2019
Abstract:
We study the orientation statistics of spheroidal, axisymmetric microswimmers, with shapes ranging from disks to rods, swimming in chaotic, moderately turbulent flows. Numerical simulations show that rodlike active particles preferentially align with the flow velocity. To explain the underlying mechanism, we solve a statistical model via the perturbation theory. We show that such an alignment is caused by correlations of fluid velocity and its gradients along particle paths combined with fore-aft symmetry breaking due to both swimming and particle nonsphericity. Remarkably, the discovered alignment is found to be a robust kinematical effect, independent of the underlying flow evolution. We discuss its possible relevance for aquatic ecology.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Bacterial Physiological Phenomena; Biomechanical Phenomena; Hydrodynamics; Models, Biological; Motion; Swimming; Models, Theoretical
Elenco autori:
Borgnino M.; Gustavsson K.; De Lillo F.; Boffetta G.; Cencini M.; Mehlig B.
Autori di Ateneo:
BOFFETTA Guido
DE LILLO Filippo
Link alla scheda completa:
https://iris.unito.it/handle/2318/1728251
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1728251/579071/Borgnino2019alignment.pdf
Pubblicato in:
PHYSICAL REVIEW LETTERS
Journal
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URL

http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.123.138003/apsxml; https://arxiv.org/abs/1909.02458
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