Numerical Investigation on the Evolution of Vertical Water-entry Cavity of a Sphere
In order to investigate the evolution of vertical water-entry cavity of a sphere,a numerical simulation for modeling the vertical water-entry of a sphere was performed,which is based on Navier-Stokes equations,volume of fluid model and dynamic mesh.It showed that numerical results compared favorably with the experimental results,which verified the accuracy of the simulation method.In addition,during the early period of the water entry,there was a high impact load on the sphere and a splash rose from the surface,and then a water-entry cavity which was open to the atmosphere formed.The cavity experienced development,closure and collapse periods after its formation.Pressure acting on the cavity was the main cause of the deep closure,and high speed up-jet and down-jet appeared after the closure.
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