导弹水下潜射过程的流体—固体耦合仿真

FSI Simulation on the Vertical Launching Process of Underwater Missile

导弹潜射是集高速流动、冲击、结构响应于一体的流体—固体—气体三态非线性耦合复杂过程,是决定潜射导弹发射成败的关键环节。本文应用LS-DYNA显式程序建立了三种包含水体、空气、导弹、发射井和筒盖的多物质耦合ALE网格模型,使用罚函数流体—固体耦合方法对导弹水下无攻角潜射过程进行了数值模拟,给出了弹体质心的轴向加速度、轴向流体阻力及阻力系数、空泡区压力分布。仿真结果表明,模型2的仿真过程与实际导弹潜射过程最为相符。同时总结介绍了LS-DYNA程序中流体—固体耦合计算的相关设定原则和方法。本文可为潜射导弹的水动力载荷设计和数值仿真提供有益的参考。

The launching of underwater missile is a nonlinear coupling process of water, structure and air, which integrates high-speed flow, impact and structural response into a whole, and is a key segment of submarine carried missile launching. The three different models with ALE multi-material mesh including water, air missile, silo and cover plate were built by LS-DYNA. The process of submarine-launched missile without attack angle was simulated by the penalty FSI. The axial acceleration of missile centroid, water resistance force and resistance coefficient and pressure distribution of cavity zone were obtained. The simulated results show that the process simulated by the model 2 is coincident well with that launched by the real missile. Additionally, some advices of FSI method and simulating experiences were concluded. It provided a new kind of reference standard for missile design and nu- merical simulation works of underwater loading.