Wake dynamics of steady flow past an obliquely oscillating cylinder at different Reynolds numbers

Research output: Chapter in Book/Conference paperConference paperpeer-review


Steady flow past an obliquely oscillating cylinder at angles of attack θ (=0⁰, 45⁰, 90⁰) between the direction of body motion and incoming flow is investigated numerically over Reynolds number Rec from 100 to 855 and velocity ratio r*=Uw/Uc ranging from 0.1 to 2.0, where Uw is the maximum velocity of cylinder motion and Uc is the incoming flow velocity used to define Rec. The oscillation amplitude-to-diameter ratio A* is fixed as 0.4. It was found that the synchronisation between vortex shedding induced by steady flow and cylinder oscillation is primarily dependent on r* and weakly on Rec. The synchronisation states, which are primarily observed at intermediate r* (~0.30–1.50), have profound influences on the time-averaged in-line coefficients Cx.mean. At the small r* end, the force and wake characteristics resemble those of von Kármán vortex streets, except that significant force fluctuations in the motion direction are observed. At large r* values, the wake and force characteristics are similar to those induced by pure cylinder oscillations. The degree of wake three-dimensionality at small and large r* generally increases with ascending r* and Rec but lacks a clear variation trend with r* and Rec at intermediate r*.
Original languageEnglish
Title of host publicationProceedings of the 23rd Australasian Fluid Mechanics Conference
EditorsChengwang Lei, Ben Thornber, Steve Armfield
Place of PublicationSydney
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)2653-0597
Publication statusPublished - Dec 2022
Event23rd Australasian Fluid Mechanics Conference - Sydney, Australia
Duration: 4 Dec 20228 Dec 2022


Conference23rd Australasian Fluid Mechanics Conference
Abbreviated titleAFMC2022


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