Trajectories and Attitudes of a Slender Submarine with Large Amplitude Motions under the Action of Internal Solitary Waves
The large internal solitary waves inside the ocean may pose a threat to the navigation stability and safety of a submarine.A time-domain solution model for the large motion of the slender submarine structure under the internal solitary waves in two-layer flow is established to explore the motion response characteristics of submarine when encountering the internal solitary waves head-on.The nonlinear forces caused by the coupling of various degrees of freedom motions are considered in the model,the internal solitary wave forces are calculated by Morison equation and Froude-Krylov force,and the static changes caused by the propagation of internal solitary wave are calculated by integrating the static pressure on the surface of submarine.The accuracy of the proposed model is verified by comparing with experimental results of physical models and computational fluid dynamics numerical results,and the motion trajectories and attitudes of SUBOFF submarine at different depths and speeds in two layers of flow are calculated by this model.The numerical results show that,under the action of internal solitary waves,the submarines above and at the density layered interface move along the propagation direction of internal solitary waves,the submarine below the density layered interface moves against the propagation direction of internal isolated waves;Vertically,the submarine will experience a significant drop in depth,and it sinks first and then floats.The submarine shows different trajectories and attitudes at different depths and speeds.
NETL
NSTL
万方数据
