Numerical investigation on cavity dynamics of water-entry bodies with different shape parameters

The cavity that occurs when a body enters water has huge effect on the underwater motion of body. Based theory incompressible potential flow, model for study water-entry dynamics is established. numerical process divided into two phases. In first phase, no forms and fluid slides continuously upward along surface. When particles surface separate from during calculation second phase. Calculating change in flow field around pressure air allows us to determine morphological changes cavity. contracts collides with body, cut parts. To verify accuracy proposed model, simulation results are compared experimental set spheres entering water. used simulate entry bodies different nose shapes length-to-diameter ratios. show breaks an annular shoulder tail