Vortex method simulations of forced, impulsively started round jet

M. Kiya, S. Izawa, H. Ishikawa

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Citations (Scopus)

Abstract

Three-dimensional vortex method simulations were performed of a forced, impulsively started round jet. The viscous diffusion of vorticity was represented by a core spreading model which approximates the growth of the rectilinear viscous vortex tube. The jet was sinusoidally forced by helical or multiple disturbances to clarify evolution of vortical structures. The multiple disturbance is a combination of two helical disturbances of the same mode and amplitude, rotating in the opposite directions. The multiple disturbance of mode 2 was found to most enhance both the growth rate and generation of small-scale vortices among the other disturbances. A turbulence core spreading model in the spirit of Smagorinsky sub-grid scale viscosity (Leonard and Chua 1989) was also studied. The linear combination of the two models can be interpreted as a Lagrangian turbulence model which includes Reynolds-number effects.

Original languageEnglish
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
PublisherAmerican Society of Mechanical Engineers
Number of pages1
ISBN (Print)0791819612
Publication statusPublished - 1999 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)

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