Numerical study on the dynamic characteristics of water entry of cavity body using two-phase SPH method

• 作者: Qiuzu Yang Fei Xu Yang Yang Jingyu Wang Anwen Wang Chunhao Ma
• 来源期刊: 力学学报（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: EXTREME MECHANICS
• 页码范围: 1072-1089
• 页数: 18页
• 语种: 英文

摘要

The air usually has a major influence on the water entry of a typical cavity body (cavity body is a hollow,cylindrical,semi-closed structure),which not only lowers the slamming load but also affects the dynamic characteristics of water entry.In this paper,a two-phase smoothed particle hydrodynamics (SPH) model for simulating the water entry of cavity body is pre-sented.The SPH model combined with Riemann solver is improved to deal with the two-phase flows with the discontinuous quantities across the interface.One-sided Riemann problem is used to impose the fluid-structure interaction and a switch-function-based Riemann solver dissipation is formulated to improve the interfacial instability owing to the strong impact.The motion equations of rigid body are incorporated into two-phase SPH model to describe the motion of cavity body.The proposed model is validated by research on the test cases in the published literature.Finally,this work presents a study of water entry of cavity body by experiment and this two-phase SPH method.The dynamics phenomena in the coupling process between cavity body and two-phase flow are investigated.And the effects of air,mass,the sizes and incline angles of cavity body on the dynamic characteristics of cavity body and two-phase flows are shown.