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Abstract
This work examined the development of the large-scale vortex structures in the wake of two screen cylinders with porosities β = 48% and 61% in the intermediate region at a Reynolds number of 7000 using two X-type hot-wire probes. The screen cylinders were made of stainless steel screen meshes rolled into a cylindrical shape. The results were compared with those of a solid cylinder (β = 0%) under the same flow conditions. It was shown that the formation of the large-scale vortices in the screen cylinder wakes involves different mechanisms. For the screen cylinder with β = 48%, they were generated due to wake instability (Kármán vortex), which closely resembled that of a solid cylinder. In contrast, for the screen cylinder with β = 61%, the vortices were formed owing to the shear-layer (Kelvin-Helmholtz) convective instability. These findings were justified by the streamwise evolution of the vortex shedding frequency, a stability analysis in the near wake using the mean streamwise velocity profiles, and the coherent and incoherent wake structures obtained by the phase-averaged analysis at different downstream locations.
Original language | English |
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Article number | 085133 |
Journal | Physics of Fluids |
Volume | 33 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Aug 2021 |
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Dive into the research topics of 'Experimental study on the development of wake vortices behind screen cylinders'. Together they form a unique fingerprint.Projects
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Development of novel inerter-based damper for platform vibration control
Bi, K. (Investigator 01), Do, D. (Investigator 02) & Zhou, T. (Investigator 03)
ARC Australian Research Council
1/01/19 → 31/12/21
Project: Research