Turbulence of swarming sperm
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...
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| Veröffentlicht in: | Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2015-09, Vol.92 (3), p.032722-032722, Article 032722 |
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| container_end_page | 032722 |
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| container_issue | 3 |
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| container_title | Physical review. E, Statistical, nonlinear, and soft matter physics |
| container_volume | 92 |
| creator | Creppy, Adama Praud, Olivier Druart, Xavier Kohnke, Philippa L Plouraboué, Franck |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevE.92.032722 |
| format | Article |
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| issn | 1539-3755 1550-2376 |
| language | eng |
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| source | MEDLINE; American Physical Society Journals |
| subjects | Algorithms Animals Biological Physics Fluid mechanics Fluorescence Image Processing, Computer-Assisted Life Sciences Male Mechanics Models, Biological Motion Physics Reproductive Biology Rheology Sheep Spermatozoa Viscosity |
| title | Turbulence of swarming sperm |
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