Numerical Simulation Of Shallow Water Tank Sloshing Under Irregular Forced Excitation

The sloshing phenomenon of the fluid in the tank will be caused when the tank containing part of the fluid moves under the action of external load.Sloshing is a very complex fluid movement with strong nonlinearity and randomness.Because of the strong interaction between the fluid and the boundary of the tank during the sloshing process of the tank,even if the external excitation is small,there is still the possibility of huge slamming force,which will bring potential safety hazards.Therefore,it is of great significance for engineering application and scientific exploration to carry out sloshing research.In view of the fact that the research on sloshing of shallow water tank still needs to be strengthened,this paper mainly studies sloshing of shallow water tank.Based on the hypothesis of potential flow theory,high-precision Boussinesq equation is used to study the sloshing motion of tank.Acompletely self-developed shallow water tank sloshing solver based on high-precision Boussinesq equation is adopted,based on the numerical simulation of shallow water tank sloshing under regular forced excitation,the irregular excitation generator solver is compiled independently to complete the numerical simulation of tank sloshing under irregular forced excitation,and the influence of different parameters on tank sloshing is explored.Firstly,the high-precision Boussinesq equation is used to deal with and transform the tank sloshing problem,and then the process of establishing the numerical model,the numerical calculation method and calculation flow are introduced.Compared with the literature,the accuracy of the numerical method is verified.The research on the surge motion under regular forced excitation shows that with the increasing of frequency,in the tank,the standing wave under non resonant condition will change to the traveling wave under resonant condition,and the number of traveling wave peaks will gradually decrease,showing a strong nonlinear phenomenon with steeper peaks and flatter valleys,which finally becomes to the standing wave.A total of five different sloshing forms were observed.The increase of amplitude will lead to the increase of wave height,but there is a fault,which makes the wave height increase sharply.The rolling motion under regular forced excitation is studied,and the results are similar to the surge motion under regular forced excitation.Irregular excitation is generated by a completely self-developed irregular excitation generator solver,and the surge sloshing motion under irregular forced excitation is studied,focusing on the influence of different working conditions on the sloshing motion of the tank.The results show that the sloshing energy of the tank changes under different working conditions,but the sloshing energy distribution of the tank is only modulated by the natural frequencies of the tank,which is independent of the significant wave height and excitation frequency.Considering the randomness of the sloshing motion of the tank under irregular forced excitation,a large number of repetitive numerical simulation studies are carried out for each working condition,and the existence intervals and average values of maximum load,maximum torque and maximum pressure under each working condition are solved,which is of great significance to the safety of liquid cargo transportation.The results show that sloshing motion of tank is more sensitive to odd-order natural frequencies.