Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J45: Suspensions: General II
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 209A
Chair: Rahul Chajwa, Stanford University
Abstract: J45.00005 : Dynamics of inertialess sedimentation of conically deformed rigid disks.
5:27 PM–5:40 PM
Presenter:
Draga Pihler-Puzovic
(Univ of Manchester)
Authors:
Draga Pihler-Puzovic
(Univ of Manchester)
Christian Vaquero-Stainer
(University of Warwick)
Tymoteusz Miara
(The University of Manchester)
Anne Juel
(Univ of Manchester)
Matthias Heil
(University of Manchester)
In this talk we study inertialess sedimentation of an achiral particle with one plane of symmetry. It is created by wrapping a circular disk around cones, so that one side the disk is more tightly curved than the other. We find that such particles tend to well-defined equilibrium orientations (with the tightly curved end pointing downwards), but sediment either in a straight line or a spiral depending on how curved they are. They also exhibits transient dynamics of increasing complexity as their asymmetry tends to zero. In the limiting case of two identical curvatures, when the disk has two planes of symmetries, i. e. it is cylindrically deformed, we recover a complex sedimentation motion that involves periodic reorientation of the disk in ever-repeating sequence of pitching and rolling.
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