Water Entry Impact Of A Wedge Based On SPH Model

When the ship is sailing at high speed or sailing under severe sea conditions,the hull head will repeatedly attack the water surface,and the hull structure will be subjected to strong slamming load,which will seriously cause local structural deformation or even damage,which will affect the navigation safety of the ship and even threaten it.The safety of the life of the ship's personnel.Therefore,it is important to accurately predict the structural response of the bow structure when slamming into the water for the design and optimization of the hull structure.The structure slamming into the water involves the problem of large deformation of the free liquid surface,and the SPH method has a good advantage in dealing with this type of method.Therefore,the SPH method is used to solve the slamming water problem of a typical two-dimensional wedge.The simulation results show the distribution of velocity,acceleration and slamming pressure of the two-dimensional wedge in the process of slamming into water,and the pressure information measured by the steel wedge free fall slam test.The simulation values are compared to verify the feasibility and accuracy of the simulation calculation.The main work of this paper is as follows:1.The free-falling water slamming test of the steel wedge-shaped plate frame was designed and carried out,slamming pressure of the wedge-shaped model during the slamming process had been measured,and analyzed the test data to give the wedge-shaped boundary under the drop height condition.The pressure distribution is summarized,and the pressure distribution law and the influence of the water entering speed are summarized.2.The open-source software DualSPHysics based on the smooth particle fluid dynamics(SPH)method was used to simulate the free-falling slamming water of the twodimensional wedge,and the response information such as velocity,acceleration and slamming pressure during the sniper was calculated.The accuracy of the numerical method is verified by the experimental data.Then the influence of the drop height,the model mass,the bottom elevation angle and the water inlet direction on the slamming response is discussed.Finally,the simplified simulation calculation of the slamming water into the Mtype hull structure is carried out,and the motion characteristics and pressure extremes of the M-type hull are obtained.The structure optimization scheme of the M-type hull antisniping performance is given.