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  • Letter
  • Open Access
  • Access by Xinjiang University

Forced and natural dynamics of a clamped flexible fiber in wall turbulence

Giulio Foggi Rota, Morie Koseki, Riya Agrawal*, Stefano Olivieri†, and Marco Edoardo Rosti‡

  • Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan

  • *Currently at United College of Engineering and Research, Allahabad 211010, Uttar Pradesh, India.
  • †Currently at Universidad Carlos III de Madrid, Leganés, 28911 Madrid, Spain.
  • ‡marco.rosti@oist.jp
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Phys. Rev. Fluids 9, L012601 – Published 12 January, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.L012601

Abstract

We characterize the dynamical behavior of a clamped flexible fiber immersed in wall turbulence over a wide range of natural frequencies (fnat) by means of direct numerical simulations. Only two flapping states are possible: one where the fiber oscillates at the characteristic frequency of the largest turbulent eddies (fturb) and another where the natural structural response dominates. The former is obtained in the more flexible cases (fnat<fturb), while the latter in the more rigid ones (fnat>fturb). We observe that in the turbulence-dominated regime, the fiber always sways at a frequency proportional to the largest scale of the flow, regardless of its structural parameters. The hindrance of the clamp to the wall prevents the synchronization of the fiber with turbulent eddies of comparable size.

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Phys. Rev. Fluids 9, L012601– Published 12 January, 2024
  • Received 12 May 2023
  • Accepted 21 November 2023
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