Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow

T. Zhou, S. F. Mohd. Razali, H. Wang, Y. Zhou

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

Abstract

Wake flows behind two side-by-side cylinders are investigated using an eight-hotwire vorticity probe in the intermediate region at four yaw angles (α), namely, 0°, 15°, 30° and 45° and for two centre-to-centre cylinder spacing ratios T*, i.e., 3.0 and 1.7. For T* = 3.0, there exist two vortex streets and the cylinders behave as independent and isolated ones. When α < 40°, the independence principle (IP) is applicable in terms of the Strouhal number. The maximum coherent streamwise vorticity contours ω*x is only about 10% of that of the spanwise component ω*z . With the increase of α, ω*x increases while ω*z decreases. At α = 45°, ω*x is about 67% of ω*z , indicating the existence of the secondary axial vortices with an enhanced three-dimensionality at larger α. For T* = 1.7, only a single peak is detected in the energy spectrum ϕv. The IP is also applicable in the wake at this spacing ratio when α < 40°. The vorticity contours for T* = 1.7 at α = 0° have a more apparently organized pattern than that at large yaw angles. However, these contours are still much less organized and are much weaker in comparison with those for T* = 3.0, indicating that the vortex motion in the wake when T* = 1.7 is not stable.

Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9781740523776
Publication statusPublished - 1 Jan 2016
Event20th Australasian Fluid Mechanics Conference, AFMC 2006 - Perth, Australia
Duration: 5 Dec 20168 Dec 2016

Publication series

NameProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016

Conference

Conference20th Australasian Fluid Mechanics Conference, AFMC 2006
CountryAustralia
CityPerth
Period5/12/168/12/16

Fingerprint

Circular cylinders
Vorticity
Vortex flow
Strouhal number

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Zhou, T., Mohd. Razali, S. F., Wang, H., & Zhou, Y. (2016). Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow. In Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006 (Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016). Australasian Fluid Mechanics Society.

Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow. / Zhou, T.; Mohd. Razali, S. F.; Wang, H.; Zhou, Y.

Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006. Australasian Fluid Mechanics Society, 2016. (Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016).

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

Zhou, T, Mohd. Razali, SF, Wang, H & Zhou, Y 2016, Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow. in Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006. Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016, Australasian Fluid Mechanics Society, 20th Australasian Fluid Mechanics Conference, AFMC 2006, Perth, Australia, 5/12/16.
Zhou T, Mohd. Razali SF, Wang H, Zhou Y. Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow. In Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006. Australasian Fluid Mechanics Society. 2016. (Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016).
Zhou, T. ; Mohd. Razali, S. F. ; Wang, H. ; Zhou, Y. / Three-dimensional Vorticity Field behind two Side-by-Side Circular Cylinders in an Oblique Flow. Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006. Australasian Fluid Mechanics Society, 2016. (Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016).
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