Flow around an oscillating circular disk at low to moderate Reynolds numbers

Xinliang Tian, Longfei Xiao, Xiangdong Zhang, Jianmin Yang, Longbin Tao, Dan Yang

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11 Citations (Scopus)
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Abstract

Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidally along its axis are performed. The aspect ratio of the disk is 10. The Reynolds number , based on the maximum speed and the diameter of the disk, is in the range of . The Keulegan-Carpenter number is in the range of . Five flow regimes are observed in the considered-space: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-region (PSL), (III) azimuthally rotating flow in the low-region (ARL), (IV) planar symmetric flow in the high-region (PSH) and (V) azimuthally rotating flow in the high-region (ARH). The critical boundaries between different flow regimes are identified based on the evolutions of the magnitude and direction of transverse force acting on the disk. For the non-axisymmetric flow regimes, the flow is one-sided with respect to the axis of the disk and is associated with a non-zero mean value of the transverse force acting on the disk.

Original languageEnglish
Pages (from-to)1119-1145
Number of pages27
JournalJournal of Fluid Mechanics
Volume812
Early online date12 Jan 2017
DOIs
Publication statusPublished - 10 Feb 2017

Keywords

  • flow-structure interactions
  • vortex instability
  • 0vortex interactions

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