On the scaling and topology of confined bluff-body flows

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Abstract

An experimental study of bluff bodies in confinement is presented. Two Reynolds matched rigs (pipe diameters: And ) are used to derive a picture of the flow topology of the primary-shedding mode (Kármán vortex, mode-I). Confined bluff bodies create an additional spectral mode (mode-II). This is caused by the close coupling of the shedder blockage and the wall and is unique to the confined bluff-body problem. Under certain conditions, modes-I and II can interact, resulting in a lock-on, wherein the modes cease to exist at independent frequencies. The topological effects of mode interaction are demonstrated using flow visualisation. Furthermore, the scaling of mode-II is explored. The two experimental facilities span Reynolds numbers (based on the shedder diameter, )

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Ford, C. L., & Winroth, P. M. (2019). On the scaling and topology of confined bluff-body flows. Journal of Fluid Mechanics, 876, 1018–1040. https://doi.org/10.1017/jfm.2019.583

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