Investigation Of The Wake Behind A Laterally Oscillating Plate

Studying the wake of forced oscillating objects is the basis for studying vortex-induced vibration,and suppression of vortex-induced vibration has a very important prospect in bridges,oceans and aerospace.In this paper,we mainly study the vortex shedding mode of transverse oscillating plate through wind tunnel experiment and numerical simulation.The research object is a plate with a width-to-thickness ratio of B/H=3,which moves up and down in the wind tunnel in a simple harmonic motion.At the Reynolds number Re=2900,the dimensionless amplitude A/H=0.5～2.0,and the dimensionless vibration frequency f H/V_∞=0.03～0.2,through the smoke line flow display technology,four vortex shedding modes of 2P+2S,2S₂,2S and P+S were found,and the hot wire anemometer measured the downstream of the plate X/B=1～9 Nine velocity profiles of the two,the numerical simulation results can be consistent with the two experimental results.Using the numerical results,the distribution diagram of the vortex shedding pattern was made on the（A/H,V_∞/f H）plane.In order to further study the wake,the pressure distribution diagram,wake width diagram and frequency spectrum were made using the results of the numerical simulation The analysis shows that the increase of the vibration frequency and amplitude will increase the width of the wake,and will also make the energy of the vortex shedding become higher.Overall,numerical simulation can better simulate the flow field in actual experiments.