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VORTEX SHEDDING CHARACTERISTICS OF A FLOW-INDUCED VIBRATING CYLINDER: EFFECT OF RIGID VERSUS FLEXIBLE SPLITTER PLATE
Journal
Journal of Flow Visualization and Image Processing
ISSN
10653090
Date Issued
2023-01-01
Author(s)
Mittal, Charu
Sharma, Atul
Abstract
The present work is based on control of frequency and patterns of vortex-shedding for an elastically mounted cylinder with a detached rigid/flexible splitter plate. The flow control technique is studied using an immersed interface method-based in-house code, for a smaller and larger gap G∗(0.3 and 2.0) between the two structures and for various reduced velocity U∗(2−12.5). The nondimensional study is presented for constant structural properties of the cylinder and the flexible plate at Reynolds number Re = 100. At the larger gap G∗ = 2.0, the trend of shedding-frequency variation with a splitter plate is similar to an isolated vibrating cylinder. However, both rigid and flexible plates lead to a small suppression in the frequency at smaller and larger U∗, and the flexible plate leads to a marginal enhancement at intermediate U∗. At smaller gap G∗ = 0.3, frequency suppression due to the splitter plate increases, with increasing U∗, with a larger suppression for the rigid plate. At G∗ = 2.0, vortex-shedding patterns also resemble an isolated vibrating cylin-der, except a novel C(2P′) pattern at intermediate U∗ for a rigid plate, whereas at G∗= 0.3, the vortex-shedding pattern shows various transitions—2S to C(2P′), C(2P′) to 2P′, and finally 2P′ to a complex nonperiodic shedding pattern with increasing U∗. These transitions correspond to a decreasing shedding frequency, presented in a vortex-shedding pattern map overlapped with the frequency response. The mechanism for the novel C(2P′) and 2P′ patterns is discussed. The splitter plate significantly modifies the frequency and shedding patterns of a circular cylinder that can be utilized for several engineering applications.
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