Mass ratio definition of vortex-induced vibration systems with added mass consideration

Yin Jen Lee, Guangya Zhou, Kim Boon Lua*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study proposes an alternative mass ratio definition for vortex-induced vibration (VIV) systems. The proposed definition, henceforth known as 'total mass ratio', differs from the conventionally used mass ratio definition (i.e. the ratio of the mass of the oscillating body to the mass of the displaced fluid) in that the added mass of the fluid is taken into account. Two-dimensional numerical simulations are conducted to compare the effect of mass ratio on the VIV response of two cylinders with different cross sections, namely, a fully-filled solid cylinder and a hollow cylinder with fluid-filled cavities; both are designed to generate identical flow characteristics. When plotted against the conventional mass ratio, VIV response amplitudes of the fully-filled and hollow cylinders are different despite the similarity in flow characteristics. Conversely, the trends of VIV response amplitude against total mass ratio for both cylinders overlap almost perfectly. Results therefore suggest that the total mass ratio definition yields a more complete representation of the mass property of the VIV system, especially when comparing cylinders of different cross-sectional geometries.

Original languageEnglish
Article numberabbac6
JournalEngineering Research Express
Volume2
Issue number4
DOIs
StatePublished - Dec 2020

Keywords

  • Added mass
  • Mass ratio
  • Vortex-induced vibration

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