Three dimensional swarming patterns in viscous fluids
speaker: Maria Rita D’Orsogna (California State University Northridge)abstract: We study collective behavior in three dimensions by considering the motion of self-propelled particles interacting in a viscous fluid environment.
Two limiting cases of fluid-mediated interactions are introduced, a "clear fluid" where particles have direct knowledge of their own velocity, that of others and of the fluid, and an "opaque fluid" where particles are able to determine their velocity only in relation to the surrounding fluid flow. Depending on the nature of the particle-particle interaction a number of three-dimensional patterns may arise. These include flocks with prolate or oblate shapes, recirculating peloton-like structures, and mill-like structures with jet-like fluid flows that entrain particles escaping from the core. We also discuss how fluid flows may stabilize emergent three-dimensional patterns that would be short-lived in fluid free environments.
timetable:
Mon 22 Jan, 14:30 - 15:20, Aula Dini
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