Flow over a bluff body with flexible splitter plates: Plate dynamics, wake velocity fields and forces

Shukla, S and Govardhan, RN and Arakeri, JH (2011) Flow over a bluff body with flexible splitter plates: Plate dynamics, wake velocity fields and forces. In: UNSPECIFIED, pp. 133-136.

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Abstract

Previous work on rigid splitter plates in the wake of a bluff body has shown that the primary vortex shedding can be suppressed for sufficiently long splitter plates. Recently, there has been interest in studying hinged rigid splitter plates behind a cylinder, both from the viewpoint of drag reduction and for the suppression of vortex-induced vibrations. In the present work, we study the problem of a flexible sheet as a splitter plate in the wake of a circular cylinder. In this case, the splitter plate is free to continuously deform along its length due to the fluid forces acting on it. Results from experimental studies are presented for the case of such a sheet like splitter plate. These measurements indicate that the splitter plate deformations appear to be in the form of a travelling wave. The maximum tip amplitudes are of the order of 1D, and the non-dimensional oscillation frequency (fD/U) is close to 0.2, approximately the same as the Strouhal number for the bare cylinder. The non-dimensional amplitude and frequency of the splitter plate appear to be nearly independent of the normalized splitter plate length (L/D) over the range of L/D values investigated. PIV measurements of the wake vorticity field indicates that there appears to be a nearly continuous sheet of vorticity on both sides of the flexible splitter plate, and the vortex sheet forms distinct vortices only at the trailing edge of the plate. The results suggest that for this fully flexible splitter plate case, the vortices form at the same frequency and are of the same strength as in the bare cylinder case, but their formation is pushed further downstream. © IUTAM Symposium on Bluff Body Flows, Blubof 2011.

Item Type:	Conference Paper
Publication:	IUTAM Symposium on Bluff Body Flows, Blubof 2011
Publisher:	Indian Institute of Technology, IIT, Kanpur
Additional Information:	The copyright for this article belongs to Indian Institute of Technology, IIT, Kanpur.
Keywords:	Circular cylinders; Vibrations (mechanical); Vortex shedding; Vorticity; Wakes, Bluff body; Flexible sheets; Fluid forces; Primary vortex; Splitter plates; Velocity field; Velocity force; Vortex induced vibration; Vortex-shedding; Wake velocity, Vortex flow
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	20 May 2024 04:29
Last Modified:	20 May 2024 04:29
URI:	https://eprints.iisc.ac.in/id/eprint/84585

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