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1 IMFT - Institut de mécanique des fluides de Toulouse 2 PRC - Physiologie de la reproduction et des comportements Nouzilly

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.

Keywords : Active suspensions Swarming flows Collective dynamics

Author: Adama Kpatagnon Creppy - Olivier Praud - Xavier Druart - Philippa L. Kohnke - Franck Plouraboué -

Source: https://hal.archives-ouvertes.fr/


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