Collective Motion of Quincke Rollers with Fully Resolved Hydrodynamics

Hydrodynamic effects are known to significantly affect the collective behavior of wet active matter systems. However, non-linear many-body nature these interactions makes them very challenging analyze, particularly in dense suspensions. Quincke rollers one canonical examples artificial microswimmers. These particles that move freely above a plate due torque generated by uniform DC electric field. A system involving many such exhibits variety dynamics, as disordered gas, polar liquid, and crystal states. This work accomplishes numerical simulations 3D containing order explicitly resolve hydrodynamic understand role play resulting dynamics. It reveals far-field tend drive ordered motion, while near-field behavior, reproduce diverse capturing between without resorting approximations previously employed.