ホーム > Séminaires > Archives séminaires > Séminaires 2020 > November 16th 2020. Sergio Chibbaro (Institut d’Alembert, Sorbonne Université) :" Irreversibility and Chaos in micro-swimmer active matter".
November 16th 2020. Sergio Chibbaro (Institut d’Alembert, Sorbonne Université) :" Irreversibility and Chaos in micro-swimmer active matter"
Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.
November 16th 2020. 11h30
There will be a live diffusion with zoom. Contact Michael Berhanu to attend the video seminar.
Sergio Chibbaro Assistant professor à l’Institut Jean Le Rond Alembert, Sorbonne Université.
Irreversibility and Chaos in micro-swimmer active matter
The properties of active suspensions of micro-swimmers are investigated through direct numerical simulation, so that no approximation is made at the continuous level other than the numerical one. We consider both pusher and puller organisms, with a spherical or ellipsoidal shape. We obtain the average velocity and the characteristic scales for an homogeneous two-dimensional suspension and the effective viscosity under shear. We bring evidences for all the complex features displayed to be related to a spontaneous breaking of the time-reversal symmetry. We show that chaos is not a key ingredient, whereas a large enough number of interacting particles and a non-spherical shape are needed to break the symmetry and are therefore at the basis of the phenomenology.
Contact : Équipe séminaires / Seminar team - Published on / Publié le 20 février 2020
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