Lock-on of Vortex Shedding Due to Rotational Oscillations of a Flat Plate in a Uniform Stream

On the flow over a rotationally oscillating flat plate: A numerical study

“…In the lock-on spectrum, only the forcing frequency and its higher harmonics appear prominent, indicating the synchronization of the vortex shedding with the plate oscillation. This observation of the spectra agrees with the experiment of Chen and Fang (1998). The state of vortex lock-on can be approached from either a lower forcing frequency (St e =St n o1) or a upper forcing frequency (St e =St n 41).…”

“…(6) and (7) are solved with initial and boundary conditions that are compatible with the experiments of Chen and Fang (1998). The flow field obtained for the stationary plate is used as the initial condition for the flow simulations of oscillating plate.…”

“…But, they did not show the vortex shedding that is locked-on with the forcing. Among the few reports on a rotationally oscillating flat plate, only Chen and Fang (1998) and Fang and Chen (2000) observed the lock-on of vortex shedding in wind tunnel experiments. However, due to limitations in the experiments, the detailed flow field of vortex lock-on and the effects of rotational oscillations of a flat plate remain unclear.…”

“…The numerical simulations are performed in a rotating reference frame attached to the plate, which yields a simpler boundary condition on the surface of the rotationally oscillating plate. The numerical results are compared with the experiments of Chen and Fang (1998). Fig.…”

Experimental Aeroelastic Models Design and Wind Tunnel Testing for Correlation with New Theory

“…Also in lower Reynolds number flow, bluff bodies in cross flow [48], and a flat plate at high angles of attack [49] are observed to have the nonlinear oscillations induced by the buffeting flow. In the buffeting flow there is a very interesting phenomenon called "frequency lock-in".…”