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Anton Peshkov (Rochester) - Metachronal waves in swarms of the nematode Turbatrix Aceti

Séminaire mécanique des fluides
Date: 2021-03-11 15:00

We present an experimental and theoretical investigation of the collective motion of the swimming nematode Turbatrix Aceti, commonly known as the vinegar eel. When placed in a droplet at high concentration, these worms self-assemble in a striking collectively moving traveling or metachronal waves. The flows produced by this state are strong enough to visibly deform the surface of the droplet and induce a rotational fluid flow. We show that the appearance of the collective state is dependent on the contact angle of the droplet, indicating possible feedback between the motion of the nematodes and the fluid. We find that the collective swimming of the nematodes radically change the physics of evaporation of the droplets from one at constant angle to the one at a constant diameter. We propose a simple Kuramoto style theoretical model that has a strong attraction to produce a traveling wave state and that is able to qualitatively reproduce the body shapes observed in the experiments. The mm size and ease of culture make T. Aceti a promising organism for experimental investigation of motile and oscillating active matter at the mesoscale where the Reynolds is of the order of unity.

 

 

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  • 2021-03-11 15:00