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Computational Study of Three-Dimensional Flow Past an Oscillating Cylinder Following a Figure Eight Trajectory by Peppa, Sofia (author);Kaiktsis, Lambros (author);Frouzakis, Christos E. (author);Triantafyllou, George S. (author) is a Engineering article available to read on EtoBox.
What is Computational Study of Three-Dimensional Flow Past an Oscillating Cylinder Following a Figure Eight Trajectory about?
The paper presents a computational study of three-dimensional flow past a cylinder forced to oscillate in a uniform stream, following a figure-eight trajectory. Flow simulations were performed for Re = 400, for different cases, defined in terms of the oscillation mode ('counter-clockwise' or 'clockwise'), for values of the ratio, F, of the transverse oscillation frequency to the Strouhal frequency close to 1.0. The results demonstrate that, for F ≤ 1.0, counter-clockwise cylinder motion is associated with positive power transfer from the flow to the cylinder, corresponding to excitation; for the clockwise motion, power transfer is negative at intermediate to high amplitudes, corresponding to damping. For the clockwise mode, in the range F = 0.9-1.1, a transition to two-dimensional vortex street is identified for transverse oscillation amplitude exceeding a critical value. This results from the induced suction of vortices, which moves vortex formation and shedding closer to the cylinder surface, thus resulting in a narrower wake, characterized by an effective lower Reynolds number. Both oscillation modes are characterized by higher harmonics in the lift force spectrum, with the thir
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It is typically read by researchers, students, and practitioners in Engineering.
- Author
- Peppa, Sofia (author);Kaiktsis, Lambros (author);Frouzakis, Christos E. (author);Triantafyllou, George S. (author)
- Publisher
- MDPI AG
- Published
- 2021
- Language
- EN
- Field
- Engineering (Physical Sciences)