Modeling and Simulation of Oblique Water-Entry of Disk Ogive

Based on water-entry dynamic and water-entry ballistic theories, the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena, and an oblique water-entry impact model coupled with ballistic and dynamic models are established. According to the exact geometric shape of the wetted body surface, the dynamic model is established. The coupling model of the oblique water-entry impact is programmed and calculated by the time stepping codes. The greatest impact load, the initial water-entry condition and the relation between water-entry impact loads are obtained. The influence of water pile on the oblique water-entry impace load are achieved. Finally, the varying rule between axial, vertical impace load and impact moment are analyzed to predict the phenomena of whip and ricochet or succedent underwater trajectory.