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Flow past a rotationally oscillating cylinder near a plane wall

Soumarup Bhattacharyya*, Raghavendra Naidu S†, Kamal Poddar‡, and Sanjay Kumar§

  • Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India

  • *Presently at Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor 48109, USA; soumarup@umich.edu
  • †srnaidu@iitk.ac.in
  • ‡kamal@iitk.ac.in
  • §Corresponding author: skmr@iitk.ac.in
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Phys. Rev. Fluids 8, 094102 – Published 27 September, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.094102

Abstract

The wake of a rotationally oscillating cylinder in the presence of a plane wall with various gap-to-diameter ratios are studied experimentally for a Reynolds number of 250. Flow visualization study is conducted using planar laser-induced fluorescence and hydrogen bubble technique in the plane perpendicular to the cylinder and in the spanwise plane, respectively, to find the effect of gap distance on the wake structures for various forcing frequencies and amplitudes. Quantitative analysis is provided using hot-wire anemometry to find the lock-on parameter space and particle image velocimetry (PIV) revealed the strength of vortices shed perpendicular to the cylinder. Various wake structures, like single-sided shedding, double-layer vortices, and detached shear layer shedding from the wall, are observed for different gap distances and forcing parameters using laser-induced fluorescence flow visualizations. PIV data reveals that the circulation strength of the vortices shed perpendicular to the cylinder reduces with increasing downstream distance. Hot-wire analysis reveals one of the key outcomes of the study, showing that the range of frequency-amplitude parameter space for which the lock-on phenomenon occurs reduces with a decrease in wall distance. Hydrogen bubble flow visualization data reveal the presence of two spanwise three-dimensional modes and characteristics of these modes with varying forcing conditions and gap distance are found. Interestingly, it is observed that there is a lack of three-dimensionalities in the flow when the gap ratio (wall spacing-to-diameter ratio) is reduced to G/D=0.5.

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Outline

Information

Phys. Rev. Fluids 8, 094102– Published 27 September, 2023
  • Received 30 January 2023
  • Accepted 28 August 2023
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