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Experiments in Fluids

, Volume 10, Issue 5, pp 294–296 | Cite as

Effect of concentration of vortices on streakline patterns

  • I. Gursul
  • D. Rockwell
Technical Notes

Abstract

This investigation addresses simulation of flow visualization of vortical structures, accounting for both the circulation and the degree of concentration of vorticity of the vortices via the exact nonlinear solution of Stuart for an unsteady mixing layer. At a fixed value of circulation, an increased concentration of vorticity (which corresponds to decrease in the area containing most of the vorticity) actually spreads the visualization marker over an increased area of the flow. Moreover, different combinations of vorticity concentration and circulation give essentially the same flow patterns.

Keywords

Vortex Vorticity Flow Pattern Flow Visualization Vortical Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Browand, F. K.; Weidman, P. D. 1976: Large scales in the developing mixing layer. J. Fluid Mech. 76, 127–144Google Scholar
  2. Cimbala, J. M; Nagib, H. M.; Roshko, A. 1988: Large structure in the far wakes of two-dimensional bluff bodies. J. Fluid Mech. 190, 265–298Google Scholar
  3. Gursul, I.; Lusseyran, D.; Rockwell, D. 1990: On interpretation of flow visualization of unsteady shear flows. Exp. Fluids 9, 257–266Google Scholar
  4. Hama, F. R. 1962: Streaklines in a perturbed shear flow. Phys. Fluids 5, 644–650Google Scholar
  5. Hussain, A. K. M. F. 1986: Coherent structures and turbulence. J. Fluid Mech. 173, 303–356Google Scholar
  6. Kurosaka, M.; Sundaram, P. 1986: Illustrative examples of streak-lines in unsteady vortices: International difficulties revisited. Phys. Fluids 29, 3474–3477Google Scholar
  7. Stuart, J. T. 1967: On finite amplitude oscillations in laminar mixing layers. J. Fluid Mech. 29, 417–440Google Scholar
  8. Ziada, S.; Rockwell, D. 1982: Vortex-leading edge interaction. J. Fluid Mech. 118, 79–107Google Scholar

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • I. Gursul
    • 1
  • D. Rockwell
    • 1
  1. 1.Dept. of Mechanical Engineering and MechanicsLehigh UniversityBethlehemUSA

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