Effect of grid-generated turbulence on the dynamics of a flexible filament hanging in cross-flow

Jorge Silva-Leon*, Andrea Cioncolini

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

This paper describes preliminary experiments carried in a wind tunnel to study the effect of different turbulence intensities (nominally Tu=0.6,0.8 and 1.0%) on the dynamics of a flexible silicone filament (length to diameter ratio L/D=83) hanging in crossflow in the range of reduced velocities of 7 < U* < 108. The turbulence intensity inside the wind tunnel was modified by employing two different grids (porosity β=0.563 and 0.026). At low reduced velocities the filament was statically reconfigured but remained mostly rectilinear along its length. As the reduced velocity was further increased the filament started vibrating, and beyond a certain critical reduced velocity large-amplitude limit-cycle oscillation motions were observed. It is suggested that the turbulence intensity (shear velocity) affects the onset of the flapping motions and the amplitude of these. However, this behavior also depends on the turbulence integral length scale.

Original languageEnglish
Title of host publicationMechanics of Solids, Structures, and Fluids
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859469
DOIs
StatePublished - 2019
Externally publishedYes
EventASME 2019 International Mechanical Engineering Congress and Exposition, IMECE 2019 - Salt Lake City, United States
Duration: 11 Nov 201914 Nov 2019

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume9

Conference

ConferenceASME 2019 International Mechanical Engineering Congress and Exposition, IMECE 2019
Country/TerritoryUnited States
CitySalt Lake City
Period11/11/1914/11/19

Keywords

  • Cilia
  • Filaments
  • Flutter
  • Grids
  • Hot-wire anemometry
  • Integral length scale
  • Turbulence

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