Hydrodynamic Numerical Simulation Of Underwater Vibration Body Based On Source Panel Method

In this dissertation,the numerical simulation method of two-dimensional underwater vibration body is studied.The mathematical model of linear and nonlinear underwater vibration body under infinite water depth based on Rankine source and the mathematical model of underwater vibration body under finite water depth are established.The hydrodynamic characteristics of linear and nonlinear vibration under twodimensional infinite water depth and finite water depth are studied.(1)In this paper,a mathematical model of potential flow underwater cylindrical vibration using the de-singularized Rankine source panel method is established,and the numerical solution of free surface wave height of underwater cylindrical vibration is numerically simulated.Under different frequencies and different liquid surface heights,the non-linear wave height and pressure variation of free surface are obtained.In this paper,the free surface wave heights under Rankine source and cylindrical vibration as well as the pressure variation patterns under different vibration time are numerically simulated.(2)The potential flow model of non-singular Rankine source panel method is established,and the numerical simulation of free surface wave height under underwater vibrating cylindrical hydrofoil is studied.The numerical solution in this paper agrees well with the previous results.The numerical simulation results show that the non-linear wave height and pressure of free surface change at different frequencies and different liquid surface heights.The numerical simulation results show that the free surface wave height is due to the vibration frequency of the vibrating body.The higher the rate is,the shallower the immersion depth is,the higher the free surface wave height is.The pressure will increase with the increase of the vibration amplitude,and the pressure around the cylinder will increase with the decrease of the immersion depth.(3)In this paper,the influence of vibration body on free surface wave and other hydrodynamic characteristics in finite water depth is studied.The influence of vibration body on free surface wave at different frequencies and depths is numerically simulated.The numerical simulation results show that the greater the frequency is,the greater the influence on free surface wave is.The deeper the water depth is,the smaller the influence on free surface wave is.The influence of different water depths on the pressure variation around the vibration body is simulated.The data show that the shallower the water depth,the greater the influence on the pressure around the vibration body.