The air usually has a major influence on the water entry of a typical cavity body(cavity body is a hollow,cylindrical,semiclosed structure),which not only lowers the slamming load but also affects the dynamic characte...The air usually has a major influence on the water entry of a typical cavity body(cavity body is a hollow,cylindrical,semiclosed 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 presented.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 switchfunction-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.展开更多
基金supported by the National Nature Science Foundations of China(Grant 11972309)the National Natural Science Foundation for Young Scientists of China(Grant 11702220)+1 种基金the Fundamental Research Funds for the Central Universities(Grant 310201901AO12)Overseas Expertise Introduction Project for Discipline Innovation(111 Project)(Grant BP0719007).
文摘The air usually has a major influence on the water entry of a typical cavity body(cavity body is a hollow,cylindrical,semiclosed 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 presented.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 switchfunction-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.
