Three-dimensional wake formations behind a family of regular polygonal plates

Handa, Hiroshi; Anderson, Robert; Zhang, J.

doi:10.2514/3.13204

Cited by 11 publications

(2 citation statements)

References 13 publications

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“…For the most part, the large-scale coherent structures in turbulent axisymmetric wakes have been generated by axisymmetric bodies, with the study by Higuchi et al, 14 who investigated the large-scale structures behind a series of regular polygon plates using flow visualisation techniques, being a notable exception. In a recent study by Nedić, Ganapathisubramani, and Vassilicos, 15 turbulent axisymmetric wakes were generated by a series of flat plates with irregular perimeters.…”

Section: Introductionmentioning

confidence: 99%

Geometrical influence on vortex shedding in turbulent axisymmetric wakes

et al. 2015

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We investigate the structures generated by the vortex shedding mechanism in turbulent axisymmetric wakes of non-axisymmetric plates, including a square plate and a series of fractal plates, and compare the results to a disk. For a given characteristic length ℓ, all plates have the same frontal area A, since ℓ = A 0.5 , but the length of the perimeter and the irregularity of the perimeter were varied in a fractal manner thus allowing us to investigate the effect of boundary conditions. Measurements were taken over a large range of downstream and radial distances in order to obtain a more robust measure for the vortex shedding energy. It was found that the fractal plates are able to reduce the vortex shedding energy by as much as 60% compared to the disk and square plates. It was also found that the frequency at which the vortex shedding structures are generated and the manner in which they organise themselves in the wake are independent of the boundary conditions of the wake generator. The results suggest that the main function of the multi-scale segments around the perimeter of the plates is to re-distribute the energy to a broader range of scales in the flow, which could explain the previously observed increase in drag coefficient for the fractal edged plates. C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Geometrical influence on vortex shedding in turbulent axisymmetric wakes

et al. 2015

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“…While early research centered on circular profiles, it was the introduction of varying body shapes that allowed for the realization that sharp edges change the behavior of wake formation. A study by Higuchi et al [61] of symmetric polygons observed vortex deformations when sharp edges were prominent. This was further confirmed in the work Hu & Zhou [62] through PIV measurements of square profiles with various chamfered edges.…”

Section: Vortex Systemsmentioning

confidence: 98%

Entrainment Processes for a Jet in Cross-flow: The Quantification of Turbulent Contributions and their Importance on Accurate Modeling

Freedland¹

2000

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This work would not be possible without the incredible support I have received over the last six years. I would first like to acknowledge my advisor, Dr. Raúl Bayoán Cal, who I am indebted to for his incredible support − both in taking a chance in giving me this opportunity and nurturing my curiosity throughout my graduate education. Special thanks to Dr. Stephen Solovitz, and Dr. Larry Mastin for their encouragement and discussions that helped shape the interdisciplinary research in this dissertation. This work would also not be possible without the support of the graduate students of the Wind Energy and Turbulence Lab. Their assistance in the laboratory, discussions on theory and fundamentals and moral support at conferences helped guide my research. Special thanks to the former students who taught me how to devise and run experiments, and my committee, who tirelessly reviewed my research for my benefit and treated me as a colleague at the conclusion of my defense.

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