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Shape of a tethered filament in various low-Reynolds-number flows

Christina Kurzthaler1,2,*, Rodolfo Brandão2,3, Ory Schnitzer3,†, and Howard A. Stone2,‡

  • 1Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
  • 2Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 3Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom

  • *ckurzthaler@pks.mpg.de
  • o.schnitzer@imperial.ac.uk
  • hastone@princeton.edu

Phys. Rev. Fluids 8, 014101 – Published 3 January, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.014101

Abstract

We consider the steady-state deformation of an elastic filament in various unidirectional, low-Reynolds-number flows, with the filament either clamped at one end, perpendicular to the flow, or tethered at its center and deforming symmetrically about a plane parallel to the flow. We employ a slender-body model [Pozrikidis, J. Fluids Struct. 26, 393 (2010)] to describe the filament shape as a function of the background flow and a nondimensional compliance η characterizing the ratio of viscous to elastic forces. For η1, we describe the small deformation of the filament by means of a regular perturbation expansion. For η1, the filament strongly bends such that it is nearly parallel to the flow except close to the tether point; we analyze this singular limit using boundary-layer theory, finding that the radius of curvature near the tether point, as well as the distance of the parallel segment from the tether point, scale like η1/2 for flow profiles that do not vanish at the tether point, and like η1/3 for flow profiles that vanish linearly away from the tether point. We also use a Wentzel-Kramers-Brillouin approach to derive a leading-order approximation for the exponentially small slope of the filament away from the tether point. We compare numerical solutions of the model over a wide range of η values with closed-form predictions obtained in both asymptotic limits, focusing on particular uniform, shear and parabolic flow profiles relevant to experiments.

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