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Inspired by the classical Kepler and Rutherford problem, we investigate ananalogous set-up in the context of active microswimmers: the behavior of adeformable microswimmer in a swirl flow. First we identify new steady boundstates in the swirl flow and analyze their stability. Second we study thedynamics of a self-propelled swimmer heading towards the vortex center, and weobserve the subsequent capturing and scattering dynamics. We distinguishbetween two major types of swimmers, those that tend to elongateperpendicularly to the propulsion direction and those that pursue a parallelelongation. While the first ones can get caught by the swirl, the second oneswere always observed to be scattered, which proposes a promising escapestrategy. This offers a route to design artificial microswimmers that show thedesired behavior in complicated flow fields. It should be straightforward toverify our results in a corresponding quasi-two-dimensional experiment usingself-propelled droplets on water surfaces.

A deformable microswimmer in a swirl: capturing and scattering dynamics