On the airflow in a cavity during water entry

The airflow physics in the cavity during entry of a symmetric wedge into water are investigated experimentally using flow visualization techniques and particle image velocimetry (PIV) measurements. spatial temporal evolutions velocity presented. Smoke indicates some small-scale phenomena like secondary vortexes, free shear layers, Kelvin–Helmholtz (K-H) instabilities within cavity. information is obtained via PIV results show that ambient gas entrained transient air bubble at wake rate nearly equal to volume change rate. Thus, it feasible use predict When descends, air-water interface has significant effect on vortex behaviors. areas shrink gradually circulation decreases over time. not only suppresses growth but also leads dissipation.