Numerical simulation of an excited round jet under helical disturbances by three-dimensional discrete vortex method

Seiichiro Izawa, Masaru Kiya, Osamu Mochizuki

Research output: Contribution to journalArticlepeer-review

Abstract

The evolution of vortical structure in an impulsively started round jet has been studied numerically by means of a three-dimensional vortex blob method. The viscous diffusion of vorticity is approximated by a core spreading model originally proposed by Leonard (1980). The jet is forced by axisymmetric, helical and multiple disturbances. The multiple disturbances are combinations of two helical disturbances of the same mode rotating in the opposite directions. The multiple disturbances are found to enhance both the generation of small-scale structures and the growth rate of the jet. The small-scale structures have highly organized spatial distributions. The core spreading method is effective in aquiring the core overlapping in regions of high extensional rate of strain.

Original languageEnglish
Pages (from-to)2880-2888
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number625
DOIs
Publication statusPublished - 1998

Keywords

  • Core spreading
  • Jet
  • Numerical analysis
  • Three-dimensional flow
  • Turbulence
  • Vertex blob method

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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