Research On Water Entry Of Wedge Section With Stiffened Panels Without And With Roll Angle Using CFD+FEM Solution

When a ship is sailing in a sloping wave,roll and heel motions are likely to occur.This will cause the stern to have a deflection angle when a slamming phenomenon occurs.The slamming load at this time is greater than the slamming load when the ship is sailing in the top wolves.If such a slamming phenomenon continues,it will lead to deformation of the stern structure,and even cause damage to the stern structure,jeopardizing the safety performance of the ship.Therefore,it is reasonable to predict the slamming load and structural stress response of the ship's stern when there is a falling angle,and it is of great significance to the safety of the ship sailing in inclined waves.Based on the conditions,this paper proposes a CFD+FEM method to study the water-entry slamming of a structure with no corners and corner wedges.This paper first proposes an open source CFD software OpenFOAM to predict the slamming load of a two-dimensional non-angled wedge profile.Based on the two-phase flow solver InterDyMFOAM in OpenFOAM software,this paper develops a package for numerical simulation of two-dimensional non-angled wedge profile water entry slamming,and it simulates the pressure and acceleration time-domain response process of water entry slamming process.A comparative analysis was performed and the agreement was very good.The sensitivity of the program algorithm was analyzed.Secondly,the program algorithm is applied to the study of the slamming load of a two-dimensional wedge-shaped profile with water entry.Then,on the basis of OpenFOAM,this paper extends the program algorithm for predicting two-dimensional wedge profiles without and with roll angle slamming loads into three-dimensions,and compares the numerical simulation results with the experimental results.And discussed the three-dimensional effect.Then compare the two-dimensional and three-dimensional numerical simulation results,and discuss the slamming pressure coefficient.The slamming load forecasting method proposed in this paper has high computational efficiency and has the potential to be applied to predict the problem of slamming in complex 3-D bow structures.Finally,this paper proposes a numerical simulation of the response process of the water-jet slamming of the three-dimensional wedge body cabin structure using the CFD+FEM method.Based on the self-developed package for predicting the slammingloads of local structures,the ANSYS software can predict stress response time domain results of wedge section with stiffened panels without and with roll angle slamming.The model test results were compared and the results were in good agreement.This paper proposes a method for predicting stress response time domain results of wedge section with stiffened panels slamming,which provides a reliable basis for future research on the response of slamming in the head of a sailing vessel in a slanting wave.It has important theoretical significance and engineering application value.