潜艇受撞数值仿真的附加质量模型

Added mass model for numerical simulation of submarine collision

潜艇受撞有限元数值仿真计算时需要考虑流—固耦合作用的影响,可以直接采用流-固耦合模型计算,但需要花费巨大的计算时间,也可以采用附加质量模型,在不影响计算精度的前提下,可以大大减小计算时间,提高计算效率。文中分别采用增加密度和增加质量点单元质量的方法建立了两种潜艇受撞的附加质量模型,并进行了有限元数值仿真计算,通过与流—固耦合模型计算结果对比、分析,表明采用后一种方法建立的附加质量模型与流—固耦合模型的仿真计算结果比较接近,可作为潜艇受撞有限元数值仿真的计算模型。

The influence of fluid-structure coupling should be considered in numerical simulation of submarine collision, and added mass model can be adopted for fluid-structure coupling model, which will spend lots of time. Two different added mass models were built by improving the submarine＇ s density as well as the mass of mass point elements, and numerical simulations were carried out. Through comparison of simulation results of added mass models with that of fluid-structure coupling model, it is proved that the later added mass model could be taken as efficient simulation model for submarine collision for its simulation results had good agreements with that of fluid-structure coupling model.