Abstract:
The effect of high Reynolds Number on flow induced vibration of a rotating circular cylinder
vibrating in transverse direction using RANS model is investigated by solving two dimensional
Reynolds Averaged Navier Stokes (RANS) Equation using SST K-Omega model and Petrov-
Galerkin (PG) finite element method. One dimensional numerical simulation has been performed
in which rotating cylinder is allowed to vibrate in transverse direction using three rotation rates
(α) 0, 0.5 and 1 and two Keulegan Carpenter (KC) numbers 5 & 10 against each rotation rate.
Wide range of Reduced Velocities (Vr) ranging from 1 to 15 are used to determine the effect of
high Reynolds Number (Re) 5000 on flow induced vibrations of a rotating and vibrating
cylinder. Mostly regular vibrations for KC =10 at all rotation rates. The vortex shedding starts
with the single vortex being shed after two flow cycles for Vr < 3, the vortex shedding changes
to one vortex being shed in one complete flow period as the reduced velocity is 4 till 6. For Vr >
7 vortex are shed in one pair regime and as the reduced velocity reaches 10 the amplitude of
vibration increases significantly due to the positive vortex attachment with the surface of the
oscillatory cylinder. The magnitude of peak frequencies is less for KC = 5 as compared to KC =
10 and increases with the increase in reduced velocity and by increasing rotation rate. The
frequency component of vibration becomes one times the frequency of fluid as Vr > 2 for KC =
5 and Vr > 5 for KC = 10. The significant increase in the amplitude of vibration shows the
mechanical energy presence through which energy can be harvested by generating very less
power. The correlation of amplitude of vibration and vortex shedding associated with vibrating
and rotating cylinder is studied.
