A turbulence model for the three-dimensional vortex blob method

Seiichiro Izawa, Masaru Kiya

Research output: Contribution to journalArticlepeer-review


A turbulence model is proposed for the three-dimensional vortex blob method. This model employs a modified version of the core spreading method introduced by Leonard and Chua (19s9) in the spirit of Smagorinsky type of eddy viscosity. The diffusion of vorticity by the molecular viscosity is represented by the core spreading whose rate is approximated by that of the rectilinear viscous vortex tube. The linear combination of the two viscosities yields a Lagrangean turbulence model which includes effects of Reynolds number. Each model is applied to an impulsively started round jet forced by two helical disturbances rotating in the counter directions. Vortical structures in the jet are compared among the models to show that the combined model can be a reasonable turbulence model.

Original languageEnglish
Pages (from-to)581-589
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number630
Publication statusPublished - 1999


  • Coherent structure
  • Core spreading
  • Jet
  • Numerical analysis
  • Three-dimensional flow
  • Turbulence model
  • Viscous diffusion
  • Vortex blob method

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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