75th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2022 — November 22, 2022)

V0112: Dancing over ridges: helical flows and transport

  • Danielle L. Chase, Princeton University
  • James V. Roggeveen, Princeton University
  • Christina Kurzthaler, Max Planck Institute for the Physics of Complex Systems
  • Howard A. Stone, Princeton University
DOI: https://doi.org/10.1103/APS.DFD.2022.GFM.V0112

We illustrate through experiments, numerics, and theory the rich dynamics at play when particles are moving near surfaces. We demonstrate that wavy surfaces induce helical motions which can lead to persistent drift perpendicular to the particle’s motion. We explore a diverse range of physical systems, including particles sedimenting near corrugations, as well as the dynamics of tracer particles being advected in flows over these surfaces. Such dynamics are relevant to the behavior of many biological and physical systems, where common assumptions of smooth boundaries might not be consistent with the physical picture.

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