1. Effect of Confinement on Flow Around a Rotating Elliptic Cylinder in Laminar Flow Regime.
- Author
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Gupta, Prateek, Panda, Sibasish, Sahu, Akhilesh Kumar, and Kumar, Deepak
- Subjects
LAMINAR flow ,FLOW separation ,FAST Fourier transforms ,REYNOLDS number ,VORTEX shedding ,DRAG coefficient ,VORTEX motion - Abstract
The flow phenomena around a rotating elliptic cylinder placed in a narrow channel is studied numerically. The walls of the channel act as a confinement that limits the flow in the transverse direction. The confinement ratio (β) , nondimensional rotation rate (α) , and the Reynolds number (Re) span across multiple values. A parametric study is done to identify the variations in drag-coefficient (C
D ) , lift-coefficient (CL ) , and moment coefficient (CM ) with changes in β, α , and Re. Near-field and far-field vorticity contours are discussed in detail. fast Fourier transform (FFT) of the time-periodic lift signals are presented to understand the shedding-frequency characteristics. Furthermore, CM values are analyzed for possible cases of autorotation. It is observed that confinement acts to delay the shedding of vortices. However, a complete suppression is not obtained even for the maximum value of β . This is likely because of the sharp flow separation at the edges of the cylinder, which tends to promote the formation of a vortex. Hovering vortices are observed for α>1 , and a special case is identified for which the hovering vortex never dissipates. [ABSTRACT FROM AUTHOR]- Published
- 2023
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