Low KC flow regimes of oscillating sharp edges I. Vortex shedding observation

Longbin Tao, Krish Thiagarajan

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Viscous flow around an oscillating vertical cylinder with a disk attached at keel is studied in detail by direct numerical simulation based on finite difference method. Over the range of flow parameters investigated, viz. Keulegan-Carpenter number (KC) from 7.5 × 10-4 to 0.75 and β = 1.585 × 105, three shedding modes were observed. These modes, named independent, interactive and uni-directional, are found to be governed by both flow parameters (KC, β) and the geometry of the disk, such as aspect ratio, td/Dd. The mechanism for the initial condition dependence of the asymmetric uni-directional vortex shedding is analyzed. The effects of KC number and aspect ratio of the disk on the vortex shedding angle are also presented.

Original languageEnglish
Pages (from-to)21-35
Number of pages15
JournalApplied Ocean Research
Volume25
Issue number1
DOIs
Publication statusPublished - 28 Feb 2003
Externally publishedYes

Keywords

  • flow regime
  • Keulegan-Carpenter number
  • sharp-edged body
  • vortex shedding

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