  The flow phenomena around a rotating elliptic cylinder in a channel is
studied numerically. The value of the confinement parameter \beta is varied as
\frac{1}{k}, where k = 2, 4, 6, and 8 respectively, to demonstrate the
vortex-shedding patterns around the cylinder in the downstream wake. The
non-dimensional rotation rate \alpha takes up 0.5, 1, and 2 as its value.
Additionally, the Reynolds number (\textit{Re}) based on the cylinder diameter
is taken to be 50, 100, and 150 respectively. A parametric study is performed
to explain the changes in drag coefficient \textit{(C_{D})}, lift coefficient
\textit{(C_{L})}, and moment coefficient \textit{(C_{M})} with variations of
\beta, \alpha, and \textit{Re}. The Fast-Fourier transform (FFT) of the
time-periodic lift signals is presented to understand the shedding frequency
characteristics, and the \textit{C_{M}} values are analyzed for cases of
autorotation. Despite the introduction of significant confinement and cylinder
rotation, complete suppression of vortex shedding is not observed for the
considered parameter space. Autorotation is observed and becomes prominent with
decrease in non-dimensional rotation rate and increase in confinement and
Reynolds number.
