title: Periodic sedimentation in a Stokesian fluid.
abstract: We study the sedimentation of two identical but nonspherical particles sedimenting in a Stokesian fluid. Experiments and numerical simulations reveal periodic orbits wherein the bodies mutually induce an in-phase rotational motion accompanied by periodic modulations of sedimentation speed and separation distance. We term these "tumbling orbits" and find that they appear over a broad range of body shapes.
authors.affiliation: Applied Mathematics Laboratory, Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012, USA.
authors.forename: Sunghwan
authors.initials: S
authors.lastname: Jung
authors.forename: S E
authors.initials: SE
authors.lastname: Spagnolie
authors.forename: K
authors.initials: K
authors.lastname: Parikh
authors.forename: M
authors.initials: M
authors.lastname: Shelley
authors.forename: A-K
authors.initials: AK
authors.lastname: Tornberg