基于SPH方法的M型快艇入水载荷仿真分析

目的]为研究M型快艇典型截面结构入水过程中受到的水动力载荷,方法]基于光滑粒子动力学(SPH)液-气两相流算法,模拟平板和弓形模型的入水过程,以验证所用算法的精确性。在此基础上,模拟M型快艇典型截面结构的入水过程,并与相关文献的试验结果进行比较。结果]结果显示:两种结构入水过程的仿真结果与试验结果吻合较好。M型快艇入水过程中存在二次砰击现象,即在主船体斜升角较大时会导致第1次砰击载荷较小,若斜升角过大时第2次砰击过程中结构则受到的砰击载荷会显着增加。结论]研究结果表明,SPH两相流算法可以很好地模拟M型快艇入水过程,斜升角的设计大小应适当。

Simulation analysis on water entry loads of high-speed M-boat based on SPH method

Objectives]This study analyzes the hydrodynamic loads of a typical cross-section structure of a high-speed M-boat during water entry.Methods]Based on the smooth particle dynamics(SPH)liquid-gas two-phase flow algorithm,simulations of both flat plate and arced structure water entry are carried out to verify the accuracy of the algorithm.On this basis,a typical cross-section structure water entry of the high-speed M-boat is simulated,and the results are compared with the experimental data available in literatures.Results]The simulation results of both flat plate and arced structure water entry are in good agreement with the experimental data.A second slamming phenomenon occurs during water entry of the high-speed M-boat,that is,a larger dead-rise angle of main hull would make the first slamming load smaller,but if the dead-rise angle is too large,the load on the structure during the second slamming will increase significantly.Conclusions]The SPH two-phase flow algorithm can accurately simulate the water entry of a high-speed M-boat.It is suggested that the dead-rise angle of a high-speed M-boat should be designed appropriately.