内波作用下水下航行体水动力载荷及运动特性研究

Hydrodynamic loads and motion features of a submarine with interaction of internal solitary waves

中国南海区域海洋内波出现频率较多。海洋内波携带着巨大能量,对于水下航行体的安全航行具有非常大的威胁。为了研究内波对水下航行体的水动力性能影响,该文基于RANS方法和KdV理论建立了分层流中的内孤立波与水下航行体相互作用的数值模拟方法。在对约束模型数值模拟分析的基础上,采用DFBI方法结合重叠网格技术,开展了内孤立波作用下水下航行体自由运动的数值模拟。分析表明,内孤立波与航行体相遇,会使得其周围流场变得异常复杂,从而引起突变的流体动力和运动,对此时的航行安全性应给予极大重视。

Internal solitary waves (ISWs) appear frequently in South China Sea. ISWs are one of the most powerful dynamic processes in the continental areas of the ocean. Thus, ISWs are a huge threat to submarines. In order to investigate the influence of internal solitary waves on submarine, a numerical method based on Reynolds-Averaged Navier-Stokes (RANS) equations was adopted in this paper. Besides, KdV internal solitary theory was used to modeling ISW-induced currents. Captive submarine model was simulated and analyzed. And, simulation for submarine free motion with the interaction of ISWs was realized by Dynamic Fluid Body Interaction method (DFBI) based on overset grid. It indicates that flow fields become very complex when a submarine goes through solitary waves, resulting an extremely considerable load and motion. Thus it is necessary to pay special attention to safe operation of submarine in ISWs.