Shear layer vortices and longitudinal vortices in the near wake of a circular cylinder

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Results are presented on (1) the shear layer vortices developing in the free shear layers located between the separation point and the first shed Strouhal vortex of a circular cylinder and (2) the longitudinal vortices developing in the braid region of the Strouhal vortices in the wake. Evidence based on flow visualization shows that the longitudinal vortices develop independently at low Reynolds numbers. An analysis is developed to show that the spanwise length scale of the longitudinal vortices in the separated shear layers and the longitudinal vortices in the Strouhal vortices are comparable near Re ≈ 1000. At higher Reynolds number, with increasing Re, the spanwise scale of the former reduces faster than that of the latter.

Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalExperimental Thermal and Fluid Science
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Jan 1996

Keywords

  • Longitudinal vortices
  • Shear layer vortices
  • Spanwise length scale
  • Wake

Cite this

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abstract = "Results are presented on (1) the shear layer vortices developing in the free shear layers located between the separation point and the first shed Strouhal vortex of a circular cylinder and (2) the longitudinal vortices developing in the braid region of the Strouhal vortices in the wake. Evidence based on flow visualization shows that the longitudinal vortices develop independently at low Reynolds numbers. An analysis is developed to show that the spanwise length scale of the longitudinal vortices in the separated shear layers and the longitudinal vortices in the Strouhal vortices are comparable near Re ≈ 1000. At higher Reynolds number, with increasing Re, the spanwise scale of the former reduces faster than that of the latter.",
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author = "J. Wu and J. Sheridan and K. Hourigan and J. Soria",
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Shear layer vortices and longitudinal vortices in the near wake of a circular cylinder. / Wu, J.; Sheridan, J.; Hourigan, K.; Soria, J.

In: Experimental Thermal and Fluid Science, Vol. 12, No. 2, 01.01.1996, p. 169-174.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Shear layer vortices and longitudinal vortices in the near wake of a circular cylinder

AU - Wu, J.

AU - Sheridan, J.

AU - Hourigan, K.

AU - Soria, J.

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AB - Results are presented on (1) the shear layer vortices developing in the free shear layers located between the separation point and the first shed Strouhal vortex of a circular cylinder and (2) the longitudinal vortices developing in the braid region of the Strouhal vortices in the wake. Evidence based on flow visualization shows that the longitudinal vortices develop independently at low Reynolds numbers. An analysis is developed to show that the spanwise length scale of the longitudinal vortices in the separated shear layers and the longitudinal vortices in the Strouhal vortices are comparable near Re ≈ 1000. At higher Reynolds number, with increasing Re, the spanwise scale of the former reduces faster than that of the latter.

KW - Longitudinal vortices

KW - Shear layer vortices

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KW - Wake

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