Shukla, S and Govardhan, RN and Arakeri, JH (2023) Flow over a circular cylinder with a flexible splitter plate. In: Journal of Fluid Mechanics, 973 .
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Abstract
In the present work, we study the flow field around, and forces acting on, a circular cylinder with an attached flexible splitter plate/flap. Two cases of flap length , namely, and have been investigated focusing on the effect of variations in flap flexural rigidity,. We find that for a range of and Reynolds numbers, a non-dimensional bending stiffness collapses flap motion and forces on the system well, as long as 5000]]>. In the flap case, two periodic flap deformation regimes in the form of travelling waves are identified (modes I and II), with mode I occurring at and mode II at lower values (<!CDATAK\ast ). In the flap case, we find a richer set of flapping modes (modes A, B, C and D) that are differentiated by their flapping characteristics (symmetric/asymmetric and amplitude). Force measurements show that the largest drag reduction occurs in mode I and mode C , which also correspond to the lowest lift and wake fluctuations, with the mode C wake fluctuations being lower than even the rigid splitter plate case. In contrast, the highest fluctuating lift, in both cases, occurs at higher, when the wake frequency is close to the first structural bending mode frequency of the flap. The observed rich range of flap/splitter plate dynamics could be useful for applications such as drag reduction, vibration suppression, reduction of wake fluctuations and energy harvesting. © The Author(s), 2023. Published by Cambridge University Press.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Fluid Mechanics |
| Publisher: | Cambridge University Press |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Circular cylinders; Drag reduction; Energy harvesting; Plates (structural components); Reynolds number; Vibrations (mechanical), Bending stiffness; Deformation regimes; Flap motions; Flexural rigidities; Mode II; Plate flaps; Reynold number; Splitter plates; Travelling waves; Vortex street, Wakes, deformation; drag coefficient; Reynolds number; rigidity; stiffness; vortex flow; wake |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 10 Dec 2024 18:38 |
| Last Modified: | 10 Dec 2024 18:38 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85398 |
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