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Turbulence of swarming sperm

Creppy, Adama Kpatagnon and Praud, Olivier and Druart, Xavier and Kohnke, Philippa L. and Plouraboué, Franck Turbulence of swarming sperm. (2015) Physical Review E, 92 (3). n/a. ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.92.032722

Abstract

Collective motion of self-sustained swarming flows has recently provided examples of small-scale turbulence arising where viscous effects are dominant. We report the first observation of universal enstrophy cascade in concentrated swarming sperm consistent with a body of evidence built from various independent measurements. We found a well-defined k−3 power-law decay of a velocity field power spectrum and relative dispersion of small beads consistent with theoretical predictions in 2D turbulence. Concentrated living sperm displays long-range, correlated whirlpool structures of a size that provides an integral scale of turbulence. We propose a consistent explanation for this quasi-2D turbulence based on self-structured laminated flow forced by steric interactions and alignment, a state of active matter that we call “swarming liquid crystal.” We develop scaling arguments consistent with this interpretation.

Item Type:Article
Additional Information:Thanks to American Physical Society editor. The definitive version is available at http://journals.aps.org/pre/. The original PDF of the article can be found at Physical Review E website : http://journals.aps.org/pre/pdf/10.1103/PhysRevE.92.032722
HAL Id:hal-01308046
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Institut Français du Cheval et de l'Equitation - IFCE (FRANCE)
Other partners > Université François-Rabelais de Tours (FRANCE)
Laboratory name:
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Deposited By: Franck PLOURABOUE
Deposited On:05 Oct 2015 12:32

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