Splitter Plate Suppression Of Vortex Shedding From A Laterally Oscillating Circular Cylinder

The control of forced oscillating cylinder wake is the basis of control of vortex-induced vibration,and of important application prospects in ocean,civil,and aeronautical engineering.In this paper,A splitter plate is placed on the wake centerline to suppress 2S,2P and P+S modes of vortex shedding from a transversely oscillating cylinder.The control parameters are width L/D of the plate and the distance S/D from the leading edge of the plate to the oscillation line of the cylinder.Numerical simulations and experiments are carried out at different plate widths in the range of L/D=1?4 and various S/D distances from 0.5 to 6.0.The main peak value in the averaged spectrum of multi-points fluctuating velocities can be used to represent vortex strength,and maps of contours of the vortex strength for the suppressions of 2S,2P and P+S mode are drawn respectively on(L/D,S/D)plane.Experimental results show that the vortex strengths of the three modes can be reduced by 30%,30% and 50% respectively at certain plate widths and certain S/D distances.The vortex strength reductions of the three modes of simulation are even higher than the corresponding ones of experiment.Simulation results show that,the 2P mode can be changed by the plate to P+2S+P,T+2S+T,2P and P+S mode respectively,and the P+S mode changed to P+2S+P,2P,2T and P+T mode respectively at different plate widths and S/D distances.The 2S mode is not changed by the plate in the studied ranges of L/D and S/D.Overall,the numerical simulation results are better than those obtained by wind tunnel experiment.