Numerical investigations of flow over a confined circular cylinder
Boundary layers; Circular cylinders; Fluid mechanics; Reynolds equation; Reynolds number; Spectrum analysis; Wakes; Confinement effects; Counter rotating; Flow over a cylinder; Lift coefficient; Numerical investigations; Peak frequencies; Shedding frequencies; Three-dimensional flow; Vortex flow
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Australasian Fluid Mechanics Society
2023
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my.uniten.dspace-239412023-05-29T14:53:20Z Numerical investigations of flow over a confined circular cylinder Mathupriya P. Chan L. Hasini H. Ooi A. 57205234006 57139456500 6507435998 7005905452 Boundary layers; Circular cylinders; Fluid mechanics; Reynolds equation; Reynolds number; Spectrum analysis; Wakes; Confinement effects; Counter rotating; Flow over a cylinder; Lift coefficient; Numerical investigations; Peak frequencies; Shedding frequencies; Three-dimensional flow; Vortex flow The unsteady flow over a cylinder confined by two parallel walls using direct numerical simulation (DNS) is investigated. The effects of two parameters, namely the Reynolds number and the blockage ratio, are the main focus for this study. The three-dimensional flow is simulated where the circular cylinder is placed symmetrically in a planar channel with a blockage ratio of ? = 0.5 at Re = 200, 300 and 500. Quantitative analysis of the flow is conducted where the lift, CL and drag coefficient, CD and Strouhal number, St are investigated as ? and Re are systematically varied. In the present study, it is found that different instability regimes are observed as the Re of the flow increases. The presence of a distinct shedding frequency is observed at Re = 200. However, increasing the Reynolds number further, the contribution of a range of frequencies surrounding the peak frequency appears as shown in the spectral analysis of the lift coefficient. The confinement effects played an important role in changing the properties of the wake. Counter rotating spanwise vortices are formed as a result of the interaction between the cylinder wake and the boundary layer of the walls in the channel which is entrained into the vortex street. � 2018 Australasian Fluid Mechanics Society. All rights reserved. Final 2023-05-29T06:53:20Z 2023-05-29T06:53:20Z 2018 Conference Paper 2-s2.0-85084096672 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084096672&partnerID=40&md5=032f8ab4d2eae748062002308f8055ca https://irepository.uniten.edu.my/handle/123456789/23941 Australasian Fluid Mechanics Society Scopus |
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| description |
Boundary layers; Circular cylinders; Fluid mechanics; Reynolds equation; Reynolds number; Spectrum analysis; Wakes; Confinement effects; Counter rotating; Flow over a cylinder; Lift coefficient; Numerical investigations; Peak frequencies; Shedding frequencies; Three-dimensional flow; Vortex flow |
| author2 |
57205234006 |
| author_facet |
57205234006 Mathupriya P. Chan L. Hasini H. Ooi A. |
| format |
Conference Paper |
| author |
Mathupriya P. Chan L. Hasini H. Ooi A. |
| spellingShingle |
Mathupriya P. Chan L. Hasini H. Ooi A. Numerical investigations of flow over a confined circular cylinder |
| author_sort |
Mathupriya P. |
| title |
Numerical investigations of flow over a confined circular cylinder |
| title_short |
Numerical investigations of flow over a confined circular cylinder |
| title_full |
Numerical investigations of flow over a confined circular cylinder |
| title_fullStr |
Numerical investigations of flow over a confined circular cylinder |
| title_full_unstemmed |
Numerical investigations of flow over a confined circular cylinder |
| title_sort |
numerical investigations of flow over a confined circular cylinder |
| publisher |
Australasian Fluid Mechanics Society |
| publishDate |
2023 |
| _version_ |
1806424540379611136 |
| score |
13.214268 |