Some new characteristics of the confined flow over circular cylinders at low reynolds numbers
Channel flow; Reynolds number; Cylinder flows; Floquet stability analysis; Low Reynolds number; Three-dimensional flow; Transition Reynolds number; Two-dimensional instability; Two-dimensional simulations; Unsteady three-dimensional flows; Circular cylinders
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Elsevier B.V.
2023
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my.uniten.dspace-251232023-05-29T16:06:52Z Some new characteristics of the confined flow over circular cylinders at low reynolds numbers Ooi A. Chan L. Aljubaili D. Mamon C. Leontini J.S. Skvortsov A. Mathupriya P. Hasini H. 7005905452 57139456500 57219943498 57215290338 14028590000 35068638900 57205234006 6507435998 Channel flow; Reynolds number; Cylinder flows; Floquet stability analysis; Low Reynolds number; Three-dimensional flow; Transition Reynolds number; Two-dimensional instability; Two-dimensional simulations; Unsteady three-dimensional flows; Circular cylinders This study summarises some new characteristics of the fluid flow over a confined circular cylinder at low Reynolds numbers. Results from both two- and three-dimensional direct numerical simulations are presented at blockage ratio between 0.1 and 0.9 and Reynolds number between 120 and 500. Floquet stability analysis of selected cases will also be presented. From the two-dimensional simulations, it is found that the fluctuating lift forces decreases with blockage ratio and becomes zero (where the flow is steady) at blockage ratio of approximately 0.7�0.8. Upon further increasing the blockage ratio to 0.9, the simulations show a dramatic increase in the fluctuating lift forces, nearly an order of magnitude greater than previously reported for an unconfined cylinder flow. It is also found that for blockage ratio of 0.5, there is a long term two-dimensional instability that becomes more prominent with increasing Reynolds number. This instability has a time scale of approximately 105 time units (D/Umax) at Reynolds number of 500. In addition, the transition between two- and three-dimensional flow at blockage ratios up to 0.5 is investigated. It is shown that the transition Reynolds number decreases with increasing blockage ratio. At high blockage ratio of 0.5, as we increase the Reynolds number, the transition to three-dimensional flow is shown to go from unsteady two-dimensional to steady three-dimensional before transitioning to unsteady three-dimensional flow. � 2020 Elsevier Inc. Final 2023-05-29T08:06:52Z 2023-05-29T08:06:52Z 2020 Article 10.1016/j.ijheatfluidflow.2020.108741 2-s2.0-85096175855 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096175855&doi=10.1016%2fj.ijheatfluidflow.2020.108741&partnerID=40&md5=bfffadaef299b85ede47e00a151dbaad https://irepository.uniten.edu.my/handle/123456789/25123 86 108741 Elsevier B.V. Scopus |
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| description |
Channel flow; Reynolds number; Cylinder flows; Floquet stability analysis; Low Reynolds number; Three-dimensional flow; Transition Reynolds number; Two-dimensional instability; Two-dimensional simulations; Unsteady three-dimensional flows; Circular cylinders |
| author2 |
7005905452 |
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7005905452 Ooi A. Chan L. Aljubaili D. Mamon C. Leontini J.S. Skvortsov A. Mathupriya P. Hasini H. |
| format |
Article |
| author |
Ooi A. Chan L. Aljubaili D. Mamon C. Leontini J.S. Skvortsov A. Mathupriya P. Hasini H. |
| spellingShingle |
Ooi A. Chan L. Aljubaili D. Mamon C. Leontini J.S. Skvortsov A. Mathupriya P. Hasini H. Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| author_sort |
Ooi A. |
| title |
Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| title_short |
Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| title_full |
Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| title_fullStr |
Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| title_full_unstemmed |
Some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| title_sort |
some new characteristics of the confined flow over circular cylinders at low reynolds numbers |
| publisher |
Elsevier B.V. |
| publishDate |
2023 |
| _version_ |
1806427656099463168 |
| score |
13.214268 |