Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body

J. Wu, J. Sheridan, M. C. Welsh

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

2 Citations (Scopus)

Abstract

In this paper, a three-dimensional inviscid vortex filament method is used to illustrate the formation mechanism of counter-rotating longitudinal vortices found in the wake of a bluff body. A vortex filament is introduced into the velocity field of an ideal Karman vortex street, and its three-dimensional evolution is tracked in the Lagrangian frame of reference. It is demonstrated that a localized perturbation, consisting of a small displacement of the vortex filament, spreads across the span of the filament, due to self-induction, to form wave-type pattern. The 'waves' are further stretched due to the background velocity field of the vortex street, forming counter-rotating longitudinal vortices.

Original languageEnglish
Title of host publicationBoundary Layer and Free Shear Flows
PublisherAmerican Society of Mechanical Engineers
Pages187-194
Number of pages8
ISBN (Print)0791813673
Publication statusPublished - 1 Jan 1994
EventProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18) - Lake Tahoe, NV, USA
Duration: 19 Jun 199423 Jun 1994

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Volume184

Conference

ConferenceProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18)
CityLake Tahoe, NV, USA
Period19/06/9423/06/94

Cite this

Wu, J., Sheridan, J., & Welsh, M. C. (1994). Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body. In Boundary Layer and Free Shear Flows (pp. 187-194). (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED; Vol. 184). American Society of Mechanical Engineers.
Wu, J. ; Sheridan, J. ; Welsh, M. C. / Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body. Boundary Layer and Free Shear Flows. American Society of Mechanical Engineers, 1994. pp. 187-194 (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED).
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Wu, J, Sheridan, J & Welsh, MC 1994, Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body. in Boundary Layer and Free Shear Flows. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, vol. 184, American Society of Mechanical Engineers, pp. 187-194, Proceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18), Lake Tahoe, NV, USA, 19/06/94.

Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body. / Wu, J.; Sheridan, J.; Welsh, M. C.

Boundary Layer and Free Shear Flows. American Society of Mechanical Engineers, 1994. p. 187-194 (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED; Vol. 184).

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

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N2 - In this paper, a three-dimensional inviscid vortex filament method is used to illustrate the formation mechanism of counter-rotating longitudinal vortices found in the wake of a bluff body. A vortex filament is introduced into the velocity field of an ideal Karman vortex street, and its three-dimensional evolution is tracked in the Lagrangian frame of reference. It is demonstrated that a localized perturbation, consisting of a small displacement of the vortex filament, spreads across the span of the filament, due to self-induction, to form wave-type pattern. The 'waves' are further stretched due to the background velocity field of the vortex street, forming counter-rotating longitudinal vortices.

AB - In this paper, a three-dimensional inviscid vortex filament method is used to illustrate the formation mechanism of counter-rotating longitudinal vortices found in the wake of a bluff body. A vortex filament is introduced into the velocity field of an ideal Karman vortex street, and its three-dimensional evolution is tracked in the Lagrangian frame of reference. It is demonstrated that a localized perturbation, consisting of a small displacement of the vortex filament, spreads across the span of the filament, due to self-induction, to form wave-type pattern. The 'waves' are further stretched due to the background velocity field of the vortex street, forming counter-rotating longitudinal vortices.

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Wu J, Sheridan J, Welsh MC. Vortex filament simulation of the longitudinal vortices found in the wake of a bluff body. In Boundary Layer and Free Shear Flows. American Society of Mechanical Engineers. 1994. p. 187-194. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED).